Making doors from MDF. Production technology. Equipment for the production of

Our production is a door leaf of a frame structure, made using natural wood, medium-density fiberboard (MDF) and restructured veneer (fine-line), adhesives and paints, glass, fasteners and other materials and products that meet the requirements of standards and THAT.

For door production Coniferous lumber "pine" with a moisture content of 7 ± 1% is used. To achieve the specified wood moisture content, the enterprise has built and operates a drying complex consisting of an autonomous boiler room, four front-loading drying chambers with a capacity of 50 m 3 each. The drying complex is equipped automated system control of drying processes. The drying chambers are equipped with reversible fans, humidification systems, wood and air moisture control sensors, and an air conditioning system. The dried lumber is unloaded into a cooling room, where it cools for 48 hours to relieve internal stress.

The resulting material is used to form the frame of the door leaf.

Door block design

The canvases consist of:

• frame (bars coniferous species wood);
• honeycomb filling (strips of special cardboard glued together in the form of a honeycomb and placed on edge);
• inserts for lock mortise (softwood blocks);
• frame cladding (MDF veneered with natural veneer);
• internal frame - “double-glazed window” made of MDF (for glazing panels)

Unglazed (solid) panels are made with only one outer frame. Glazed doors They have an internal frame corresponding to the size of the inserted glass and slatted filling.

MDF (MDF-medium-density fiberboard) medium-density fiberboard is a sheet material made from tree species in environmentally friendly conditions by dry hot pressing, with an increased density of 850 kg/m. cube

In MDF, the developed surface of wood fibers and a shortened pressing cycle are effectively combined with strength due to the participation of binders in interfiber interaction. The production technology of MDF doors eliminates the use of epoxy resins and phenol that are harmful to health.

This type of semi-finished product is highly environmentally friendly, and also has excellent characteristics of compactness, fiber adhesion, and dimensional stability over a long period of time.

The use of this material in door production allows to acquire the properties of excellent planarity of the web surfaces, surface hardness and impact resistance.

Honeycomb- This is a high-tech material used to form the frame of the structure. Honeycombs got their name due to their geometric similarity to honeycombs. The main task of the material is to fill the space between the two skins. By placing a honeycomb core between the skins, the rigidity of the structure actually increases by a factor of 100 or more - this is the effect of the separation of the carrier layers. Thus, the honeycombs placed between the skins do not particularly burden the structure, because they are light, but they guarantee strength. Honeycomb core is the most promising material today for the manufacture of ultra-light and durable structures for various purposes.

Filling the door leaf using cardboard honeycombs:

1. timber frame (solid);
2. facing panel;
3. cellular filling.

Door design With cellular filling significantly lightens the weight of the canvas, which reduces the load on the hinges, has good heat and sound insulating properties, and also avoids warping of the canvas during operation.

Natural veneer- These are thin sections of natural wood that have the color and texture of wood. The undeniable advantage of such material is door production is that it preserves the natural pattern of wood, which cannot be conveyed by any modern technological tricks. In addition, natural veneer is durable, it does not peel off or dry out, because it is glued to an MDF base.

The surface is covered with veneer and the frame of the canvas is assembled using the hot pressing method. Next, the door leaf is formatted to size in length and width, followed by gluing the ends with veneer.

To create an individual profile for each model, milling is carried out along the contour specified by the template. The processing process is personal for each type of canvas.

Each door leaf is processed by manual grinding of the surface with abrasive materials. To obtain the smoothest possible surface, our specialists have developed a step-by-step system for processing the door leaf with a grinding tool with varying degrees of graininess.

Finishing of a covering is made by experts of the highest category manually by paints and varnishes of the Swedish production "Becker Acroma". This two-component alkyd varnish on an organic basis has a high covering ability due to high content dry residue and forms a strong and, at the same time, elastic film on the surface of the product. In addition to the decorative function, the lacquer coating plays a protective role - it prevents the canvas from swelling when the room humidity is too high and protects the door structure from drying out at low humidity.

And besides, do not forget that the varnish also gives the surface of veneered doors a more beautiful appearance. Only after varnishing does the final color of the wood appear....

On door production a system for identifying the performers of operations has been introduced, which allows minimizing the number of defective products and identifying a specific contractor that allows a violation of the technological process. Marking is made on the upper and lower edges of the door leaf. Each product undergoes strict control by the Quality Control Service. Frosted glass "Bronze" is installed in the door leafs under the glazing, which gives the door its individuality and completeness. Glazing is made with the help of elastic gaskets in the amount of six pieces, which eliminates the vibration of the glass and ensures its clear fixation. Thanks to this glazing technology, the glass can be easily removed and reinstalled.

All door leafs are packaged in corrugated cardboard around the perimeter and polyethylene packaging, which allows us to protect our products from external influences. All our products are necessarily equipped with a product passport, with detailed description warranty obligations and recommendations for storage and operation.

Box timber manufacturing technology

Materials used:

• lumber: pine, moisture content 8±1%;
• MDF - 10 mm;
• c. natural veneer.

Manufacturing technology. The base of the box lumber is made from dry lumber using the end-joint method. When splicing lumber, wood defects are removed: knots according to tolerance standards, cracks, blue stains, rot, etc. Glued blanks are profiled to a given size on four-sided planing machines. MDF is cut to a given size at a cutting center. The use of this machine provides the necessary geometry of the workpiece. The MDF strip is glued with hot melt adhesive on an automatic line for lining molded products. The resulting “rough blank” is processed on four-sided planing machines, after which natural veneer is glued to the blank on an automatic line for veneering molded products. The veneered box timber arrives at the painting shop. Where the final finishing of products is carried out: grinding, applying primer and finishing coat varnish.

Manufacturing technology of platband and additional trim

The casing is made of profiled MDF blanks wrapped in fine-line veneer and having a paint coating identical to the door leaf. Packed in polyethylene. The additional element is made from MDF blanks and lined with appropriate veneer. Packed in polyethylene.

In the production of door panels, the hot pressing method is used. A distinctive feature of this method is its high productivity. Due to the high temperature, the glue between the parts of the door leaf quickly hardens. One of the distinctive features of modern production is the use of honeycomb core - the most promising material for the manufacture of ultra-light and durable structures. By placing honeycomb core between the skins, the rigidity of the structure increases sharply by more than 100 times.

Honeycomb core is one of the most economical modern structural materials currently available. Considerable strength with low weight, environmental friendliness, good heat and sound insulation, the ability to withstand shock loads, high processing technology are the main factors that ensure high quality products.

Honeycombs, depending on the cell size and cardboard density, differ in their physical and mechanical properties. For doors, honeycombs with a cell size of 45 mm, 35 mm or less, and a compressive strength in the stretched state of at least 0.5 kg/cm 2 (GOST 23233-78) are mainly used.

Innovative honeycomb technology is now used in wooden structures such as doors, furniture panels, interior elements, shipping pallets, as well as in aircraft and sports equipment.

Particular attention in the manufacture of door panels by hot pressing with the use of honeycomb core is given to such technological parameters as temperature, time, pressure. Strict adherence to them allows us to obtain high-quality products.

Door leaf interior door consists of the following parts:

1. Frame
2. Bars for inserting fittings (hinges, handle, lock)
3. Sheathing
4. Honeycomb

For the manufacture of the frame, chipboard (chipboard GOST 10632-89), MDF (medium density fiberboard GOST 27680-88), or a combination of them, depending on the wishes of the customer, are used. Frame parts are made glued in width and length. Wood is glued along the width to a smooth fugue according to GOST 9330-76, and along the length - to a toothed tenon according to GOST 19414-74.

At the locations of hinges, handles and other devices, the longitudinal bars of the frame are increased in width due to additional installation bars. In a frame made of chipboard - with a lock and hinges. When processing a part of the frame of the door leaf, the thickness tolerance is very important and should be reduced to a minimum. In the lower and upper bars of the frame, channels are made in the form of holes or grooves for the release of water vapor from the glue, in order to avoid deformation of the web from hot vapors and moisture.

The honeycomb filler is stretched according to the dimensions of the frame of the door panel, installed in the frame and fastened with brackets to the frame. The thickness of the filler is selected in accordance with the thickness of the frame so that during pressing there is no swelling or dips on the surface of the skins.

The main function of the honeycomb filler is to fill the void between the skins and stiffen the web, prevent deformation of the skins on both sides of the web, and thus obtain a uniformly flat surface.

For the manufacture of sheathing, TSN-40 is used, HDF laminated with decorative film. Parts are prepared with an allowance to fit the frame for subsequent formatting to the final size. Application of hot-curing resin or PVA glue, depending on the model being manufactured, onto the frame of the door leaf, with a fixed honeycomb core, is carried out using special glue-applying equipment. The most used hot curing resin KF, as it is easy to use, requires more low pressure press and is also a cheap material. A frame is laid on one skin, a second skin is laid on top and placed in a press. The press is adjusted to a pressure that creates a force on the surface of the pressed product that is slightly greater than the compressive strength of the honeycombs used.

Billets, after their aging and complete cooling, are processed to the desired dimensions on a format-cutting center.

Molded profile products.

timber door frame, platband and additional element are also made of chipboard, MDF, or a combination of them, again, depending on the type of batch being made, the order being executed. On special equipment, workpieces are processed to the desired geometric shapes and sizes and veneered (wrapped) decorative films. The process of laminating molded products is, in fact, identical to the process of laminating door panels. The only difference is that in the first case, the parts have a complex geometric shape, and in the second they are absolutely flat. And, accordingly, different equipment is used for these purposes.

All operations of the technological process are performed on high-tech machines of imported and domestic production.

In the production of all types of products, several developments have been applied regarding individual operations and the materials used, which are the intellectual property of the enterprise.

Artistic glass processing

Before giving each individuality and originality, our designers develop an original design for each model. In this case, the buyer can take a direct part in the creation of the pattern or ornament he needs. We have the opportunity to make any of your fantasies come true.

For these purposes, two types of artistic glass processing technology are used at the glass manufacturing site.

1. Matting. This is sandblasting the workpiece of the desired size in special chambers or glass processing with matting paste. There are solid matting and with a pattern. In the latter case, in order for the pattern to be highlighted on the total glass area, a stencil of the required shape is used.
2. Fusing. This is the process of sintering pre-cut glass fragments of a pattern on a substrate. High-temperature furnaces are used for these purposes. Pattern elements and substrates are cut from special glass in various colors.

Other materials:

Interior doors are an indispensable element in the interior, which helps in isolating rooms, distributing smells and noises. There are a lot of high-quality doors, so those who are familiar with the technology for making interior doors with their own hands are especially lucky, as this will make it possible to significantly save their money.

How to make a door with your own hands?

Kinds

Before we begin describing the manufacturing process, it is worth considering possible options doors. Plywood products are easy to make, but glass and wood are more difficult. This will require special equipment, as well as experience. The main types of canvases for dividing rooms today are:

1. Paneled interior doors are distinguished by excellent sound insulation and light weight. It is not easy to make them with your own hands, since they have a rather complex design and the technology for their creation is not very simple - they consist of:

• frames into which glass is inserted;
• and a panel, which is a shield, as shown in the photo.

1. Panel interior doors can be called universal, as they are perfect both as entrance doors and as for dividing rooms. They are made of panels lined with plastic or plywood. This type is a simple design, and is of excellent quality and reasonable cost.

Types of coatings

Doors can be covered with the following types of coatings:

• lamination;
• staining;
• veneering;
• and toning.

The simplest of them are painting and tinting.

For painting you will need one, and sometimes several layers of paint. Moreover, the quality of work directly depends on the types of paint used and the equipment used.

As for tinting, in this case a transparent or translucent varnish is used for coating. This method will help to perfectly convey the texture of the wooden base, as can be seen in the photo. But for soft wood this type of coating is undesirable, as it can leave small dents and scratches on the surface.

The lamination process consists of applying a plastic or paper film by pressing.

Related article: Proper soil fertilization

Veneering consists of applying a film of wood, the thickness of which is 1 mm, to the door leaf.

Tools and materials

To begin the production of paneled interior doors, you will need not only special knowledge, but also relevant experience. But there is such a type of product, for the manufacture of which you will need:

• screwdriver;
• kitchen knife;
• hacksaw;
• roulette;
• coarser sandpaper.

As for the materials, you will need to purchase:

• three boards with a thickness of 50 millimeters;
• 5 rails for the frame (2 longer and 3 short);
• Fiberboard, the amount of which depends on the size of the canvas;
• glue and screws;
• finishing materials, which are selected depending on the design of the future product;
• accessories to choose from.

Main stages

The least cost will be needed when reconstructing the paintings located in your premises. For this:

• remove them from the hinges and lay them on a level surface, for example, a table;
• then remove all available fittings, namely handles, hinges, and if there is a lock;
• Before starting the main work, you should decide what result you want to achieve and what product you will get as a result of your work. This may be a product with a solid door leaf, or it may be with a window frame, as shown in the photo;

• Having decided on what you will strive for, you can begin the main work. To begin with, in both the first and second options you need to remove all old paint, guided by the video. Suitable for this sandpaper or Sander. Putty is perfect for removing defects such as cracks, crevices and holes. You should also lubricate the surface with an antiseptic, which will help with further coating of the canvas with one of the liquid materials.

1. We make markings guided by the video. To do this, take a ruler and a square, as well as a marker or pencil. It is necessary to make certain indentations on all sides of the canvas: more than 160 millimeters on top, more than 500 mm on the bottom, 105 mm on the sides;
2. Now you need a drill. It is necessary to make 5-7 holes in the markings in the corners, taking into account a step of 3-5 mm. We cut with a hacksaw, making sure that the cut points are straight;
3. After cutting, remove the resulting fragment and insert wooden slats coated with wood glue between the plywood. If the cardboard ribs get in the way, try breaking them out a little using pliers. You should not expect the glue to dry completely; immediately take a hammer and small nails and attach all the slats;
4. Decorative elements will help to give the canvas an original look. If you have stencils and contrasting paints, now is the time to use them. Vinyl stickers are also a great help; they can be regularly replaced with new ones, thereby updating the design;
5. If the doors are made of PVC, then the new kind they will be given a colored self-adhesive film. You can also simply paint them with acrylic paint, sold in spray cans. But before you start painting, it is worth testing at the end;
6. A glass door can be decorated using stained glass film, or painted with your own hands. For the second option, you can order a stencil according to your sketch and make a drawing on the glass. It is worth paying attention to the glazing beads that support the glass, as they periodically become loose and can lead to glass falling out.

Interior veneered door of our production is a door leaf with a frame structure made using natural wood, medium-density fiberboard (MDF) and restructured veneer (fine-line), adhesives and paints, glass, fasteners and other materials and products that meet the requirements of standards and specifications.

For door production lumber of coniferous wood "pine" with a moisture content of 7 ± 1% is used. To achieve the specified wood moisture content, the enterprise has built and operates a drying complex consisting of an autonomous boiler room, four front-loading drying chambers with a capacity of 50 m 3 each. The drying complex is equipped with an automated control system for drying processes. The drying chambers are equipped with reversible fans, humidification systems, wood and air moisture control sensors, and an air conditioning system. The dried lumber is unloaded into a cooling room, where it cools for 48 hours to relieve internal stress.

The resulting material is used to form the frame of the door leaf.

Door block design

The canvases consist of:

• frame (coniferous wood bars);
• honeycomb filling (strips of special cardboard glued together in the form of a honeycomb and placed on edge);
• inserts for lock mortise (softwood blocks);
• frame cladding (MDF veneered with natural veneer);
• internal frame - “double-glazed window” made of MDF (for glazing panels)

Unglazed (solid) panels are made with only one outer frame. Glazed doors They have an internal frame corresponding to the size of the inserted glass and slatted filling.

MDF (MDF-medium-density fiberboard) medium-density fiberboard is a sheet material produced from wood species in environmentally friendly conditions by dry hot pressing, with an increased density of 850 kg/m. cube

In MDF, the developed surface of wood fibers and a shortened pressing cycle are effectively combined with strength due to the participation of binders in interfiber interaction. The production technology of MDF doors eliminates the use of epoxy resins and phenol that are harmful to health.

This type of semi-finished product is highly environmentally friendly, and also has excellent characteristics of compactness, fiber adhesion, and dimensional stability over a long period of time.

The use of this material in door production allows to acquire the properties of excellent planarity of the web surfaces, surface hardness and impact resistance.

Honeycomb is a high-tech material used to form the frame of a structure. Honeycombs got their name due to their geometric similarity to honeycombs. The main task of the material is to fill the space between the two skins. By placing honeycomb core between the skins, the rigidity of the structure actually increases by 100 times or more - this is the effect of spacing the load-bearing layers. Thus, the honeycombs placed between the skins do not particularly burden the structure, because they are light, but they guarantee strength. Honeycomb core is the most promising material today for the manufacture of ultra-light and durable structures for various purposes.

Filling the door leaf using cardboard honeycombs:

1. timber frame (solid);
2. facing panel;
3. cellular filling.

Door design with honeycomb filling significantly lightens the weight of the canvas, which reduces the load on the hinges, has good heat and sound insulating properties, and also avoids warping of the canvas during operation.

Natural veneer- these are thin sections of natural wood that have the color and texture of wood. The undeniable advantage of such material is door production is that it preserves the natural pattern of wood, which cannot be conveyed by any modern technological tricks. In addition, natural veneer is durable, it does not peel off or dry out, because it is glued to an MDF base.

The surface is covered with veneer and the frame of the canvas is assembled using the hot pressing method. Next, the door leaf is formatted to size in length and width, followed by gluing the ends with veneer.

To create an individual profile for each model, milling is carried out along the contour specified by the template. The processing process is personal for each type of canvas.

Each door leaf is processed by manual grinding of the surface with abrasive materials. To obtain the smoothest possible surface, our specialists have developed a step-by-step system for processing the door leaf with a grinding tool with varying degrees of graininess.

The finishing of the coating is done manually by specialists of the highest category using Swedish-made paints and varnishes “Becker Acroma”. This two-component organic-based alkyd varnish has high covering power due to its high solids content and forms a durable and, at the same time, elastic film on the surface of the product. In addition to its decorative function, the varnish coating plays a protective role - it prevents the canvas from swelling when the room humidity is too high and protects the door structure from drying out when the humidity is low.

And besides, do not forget that the varnish also gives the surface of veneered doors a more beautiful appearance. Only after varnishing does the final color of the wood appear.

On door production a system for identifying the performers of operations has been introduced, which allows minimizing the number of defective products and identifying a specific contractor that allows a violation of the technological process. Marking is made on the upper and lower edges of the door leaf. Each product undergoes strict control by the Quality Control Service. Frosted glass "Bronze" is installed in the door leafs under the glazing, which gives the door its individuality and completeness. Glazing is made with the help of elastic gaskets in the amount of six pieces, which eliminates the vibration of the glass and ensures its clear fixation. Thanks to this glazing technology, the glass can be easily removed and reinstalled.

All door leafs are packaged in corrugated cardboard around the perimeter and polyethylene packaging, which allows us to protect our products from external influences. All our products are necessarily equipped with a product passport, with a detailed description of warranty obligations and recommendations for storage and operation.

Box timber manufacturing technology

Materials used:

• lumber: pine, moisture content 8±1%;
• MDF - 10 mm;
• c. natural veneer.

Manufacturing technology. The base of the box lumber is made from dry lumber using the end-joint method. When splicing lumber, wood defects are removed: knots according to tolerance standards, cracks, blue stains, rot, etc. Glued blanks are profiled to a given size on four-sided planing machines. MDF is cut to a given size at a cutting center. The use of this machine provides the necessary geometry of the workpiece. The MDF strip is glued with hot melt adhesive on an automatic line for lining molded products. The resulting "rough workpiece" is processed on four-sided planing machines, after which natural veneer is glued onto the workpiece on an automatic line for facing molded products. The veneered box timber arrives at the painting shop. Where the final finishing of products is carried out: grinding, priming and finishing varnishing.

Manufacturing technology of platband and additional trim

The casing is made of profiled MDF blanks wrapped in fine-line veneer and having a paint coating identical to the door leaf. Packed in polyethylene. The additional element is made from MDF blanks and lined with appropriate veneer. Packed in polyethylene.

Production of interior doors

Interior doors are a necessary part of residential, industrial and office premises. When choosing door leaves and additional elements, you need to know how and according to what rules they are made, as well as understand the advantages and disadvantages of the materials used in the production of doors. Modern manufacturers use high-tech equipment that allows them to produce a large number of high quality products with various types of coating and modern design.

Manufacturing technology of interior doors

Doors serve to separate different functional parts of the room and provide sound insulation, protection from foreign odors and excess moisture. Methods for manufacturing door leaves and additional elements depend on the materials used in production. The most popular doors are those that are made of solid wood or prefabricated on a wooden frame. Glass inserts make the canvas partially permeable to light and visually expand the space of rooms or corridors.

The most complex and multi-link technological process occurs in the manufacture of doors using wooden elements. The fact is that timber that has not gone through a full cycle of pre-drying and processing is susceptible to warping and cracking. To avoid losses in the quality of the final product, it is necessary to pay great attention to the preliminary preparation of wood using certain technological techniques. The manufacturing process of interior doors includes the following steps:

Timber (round timber) of pine species is sawn into blanks using band saws with automatic feeding logs

Logs are sawn into pieces of the required thickness

Drying of lumber is carried out under the influence of steam and high temperature

Defective areas are cut out from the workpiece cut into timber.

Using a vertical press, a door panel blank is produced

During final assembly, paneled elements or glazing are installed

The technological sequence for manufacturing doors may be different and this depends on the material, equipment and design of the product. For example, expensive doors made from solid wood do not typically use veneer and are made using complex CNC machines, while budget doors often use corrugated cardboard inserts and cheap lamination film.

It is important to note that in the factory, fittings on doors with symmetrical decor are usually not installed, since when installed at the consumer’s site, the product can open either to the left or to the right; accordingly, hinges and handles are installed by installers locally.

Video: making solid wood doors

Rules and regulations for the production of interior doors

Door blocks are manufactured using equipment located in large production areas. These premises are subject to certain requirements, such as industrial facilities, which includes timber warehouses, dryers, a processing shop, a paint and varnish department and a finished product warehouse. Each production site is equipped according to the rules and regulations, in accordance with the technical conditions for specific task. The main requirements for industrial premises for the production of doors are the following criteria:

• availability of free access roads;
• buildings must ensure stable temperature, humidity, natural and artificial lighting;
• electricity supply, heating, ventilation, water supply and sewerage must be provided;
• premises must be equipped with fire alarms, fire extinguishing equipment and emergency exits;
• it is necessary to ensure safe working conditions in the workplace;
• paint areas must be isolated from other rooms and provided with fresh ventilation.

Personnel are required to undergo professional training and education in labor protection, fire and electrical safety standards, as well as undergo unscheduled, repeated and initial briefings in the workplace.

The production facility must be equipped in accordance with standards

The main standard for the production process is technological documentation, which is based on Technical conditions for production TU 5361−001−58037723−2015 “INTERIOR DOORS, PARTITIONS AND MODELED PRODUCTS FOR THEM.” This document sets out the requirements for the design of interior doors, the quality of material and coating of the front surface, as well as environmental requirements. The standards specify the procedure for acceptance of finished products, certification and installation of a warranty period.

It is important for the buyer to have a certificate, a warranty period and compliance of the door, frame and additional elements with the requirements of technical specifications, since this confirms the quality of the product and allows you to count on long term operation.

Current GOST standards for the production of interior doors

The technical characteristics of doors are determined by the standards that set the general specifications or methods for determining the physical parameters and dimensions of finished products. Many manufacturers create products in non-standard sizes, but with strict adherence to quality requirements. The consumer may be interested in the list of regulatory standards that manufacturers of interior doors work on, namely:

1. General requirements for wooden doors with a list of regulatory documents are established by GOST 6629–88, and requirements for wood products are set out in GOST 475–78.
2. Design options for interior doors, their types and sizes are specified in GOST 24698–81.
3. Requirements for supplements, fasteners and loops are assigned GOST 538–88.
4. Methods for determining sound insulation, heat transfer resistance and air permeability are regulated by GOST 26602.
5. The determination of the flatness of the door leaf is carried out according to the standard ST SEV 4181–83.
6. The methodology for testing reliability is set out in ST SEV 3285–81.
7. Impact load resistance is produced according to the method specified in ST SEV 4180-83.

IN accompanying documents must be present on finished products symbol door panels, e.g. U05195 VERSAL pat. 1014 dec/or door leaf D3 91x 230 L, which means the following door parameters:

• article - U05195;
• the trade name of a particular collection is VERSAL;
• type of finish/color − pat. 1014 dec/oro;
• product name - canvas;
• product model - D3;
• width and height of the canvas - 91x230;
• opening type, left - L.

Before ordering doors, you must carefully measure doorways to select the desired size of box, canvas and the required number of additional elements. For interior doors, there are standard opening dimensions with the corresponding designation according to SNiP, and this approach makes it easier to select a door frame according to the table.

Table: relationship between the dimensions of the opening and the dimensions of the door leaf

Existing regulatory documents guarantee a high level of product quality, standardization in size and compliance with environmental requirements; in addition, the consumer can determine the compliance of the product properties declared by the manufacturer with the quality and price level.

Material for the manufacture of interior doors

In the production of interior doors and partitions, modern materials are used, which are environmentally friendly, durable, lightweight and long term operation. These include metal-plastic and glass doors, for which it serves as a frame aluminum profile, and the filler is plastic panels or tempered triplex glass with a matte finish. But traditional doors with wooden frame and inserts made of glass, MDF panels and paneled elements occupy the main niche in the market. The following materials are used in the manufacture of such products:

1. Pine lumber cleared of defects with a moisture content of no more than 8%, spliced ​​into a tenon using adhesive pressing.
2. High density particle boards.
3. Natural veneer from various types of wood with a thickness of 0.6 mm.
4. Laminating film imitating precious wood.

Laminating film gives doors the texture of natural wood

Corrugated cardboard is used for insulation and sound insulation of inexpensive door panels

The production of inexpensive doors is based on the use of chipboard, laminating film, corrugated cardboard and MDF, while more expensive products use solid wood with milled elements, panels and tempered glass inserts.

The author of the article has six years of experience in using veneered paneled doors shows their significant reliability. But in rooms with high humidity, I would like to recommend various types of laminated doors with an additional waterproof coating. After four years of service in the bathroom, the interior veneer panel, despite being treated with liquid wax twice a year, developed whitish stains and streaks from exposure to steam and condensation. It was necessary cosmetic repairs, so I had to sand the surface of the door leaf, degrease it with a solvent, cover it with a coloring compound and waterproof varnish in two layers. To a lesser extent, the same problem appeared in the laundry room, and as for the other doors, minor damage to the veneer and scratches were eliminated by gluing and treating with hard, tinted wax of various shades. After such minor repairs, the canvas, boxes and extensions acquire their original appearance and serve for more than six years. In dacha conditions during summer living, wooden doors coated with waterproof varnish last more than eight years. In this case, warping and drying out do not occur under conditions of temperature changes and changes in humidity. But it should be noted that the best option For country house construction are metal-plastic doors and frames that do not change their properties and maintain their geometry under changeable weather conditions.

Equipment for the production of interior doors

The most expensive production of interior doors, in terms of the amount of equipment required, is the production of wood products. Factory products made of metal-plastic and glass require a large number of components and a small number of machines for cutting frames and processing glass panels. Processing of lumber is more saturated with machines, presses and other equipment. Let's consider the equipment that is used for production wooden doors:

Sawmills and band saws used for cutting round timber.

The sawmill allows you to obtain lumber of the required thickness from round timber

Industrial drying chambers allow you to bring lumber to the required level of humidity and avoid warping of the workpieces

The machine is designed for cutting tenons on wooden workpieces

Using a pneumatic press, the door leaf is glued together

Using milling machines, shaped and paneled elements are produced

The list of production parks can be expanded due to the use of various technological and design solutions in the production process of interior doors and components, which has a positive effect on the consumer properties of the final product.

Video: production of interior doors

We reviewed some types of interior doors, production technology, as well as regulatory documents and requirements governing products of this type. To choose the right doors, you need to know the properties of the coating and the material from which they are made. Quality equipment and adherence to production technology ensures resistance to external influences and a long service life of the products. Wide choose design solutions allows you to give the living space an individual look and unique style.

MDF door manufacturing technology

IN modern construction MDF board has confidently taken one of the leading positions among materials for furniture manufacturing, interior partitions, platbands, door blocks and leaves. This material is a slab made of natural sawdust medium density. The production of MDF involves steam processing under pressure of pre-ground sawdust. After this stage of production is completed, the wood is rubbed to the state of fibers similar to felt discs of a defibrator, the formation of a “carpet” from them, its pressing, drying and sanding.

As a result, the slab is quite dense and homogeneous. Its main advantages are

There is not a single building material that does not have shortcomings. As for MDF, it is worth noting the fact that the integrity of the MDF structure if it is seriously damaged cannot be restored and must be replaced. In addition, you can count on a long service life for furniture or doors made of MDF only if the material is manufactured in full accordance with technological requirements and properly dried.

Key differences in decorative door trim

Painted MDF doors

When using this type of decorative door decoration, enamels and paints can be used, which have good spreadability and elasticity of the resulting protective coating. In this way, it is possible to provide the product with an excellent appearance, as well as sufficiently high resistance to external influences (chemical and physical). Factory painting can be done using automatic equipment or manually.

Veneered materials

The process of veneering (or veneering) a material involves gluing it onto base surface MDF decorative layer of veneer made from valuable wood species of one or more species. As a result, the resulting structure takes on the appearance of a solid product, but at the same time loses all the disadvantages associated with the use of solid wood: they become

Laminated MDF doors

Lamination technology involves applying PVC film under pressure to the front surface of an MDF board. Depending on the chosen finishing material, it is possible to achieve completely different decorative effects: the product can become glossy or matte, imitating texture natural stone or a certain type of wood. In addition to the decorative qualities of the resulting surface, it is possible to provide increased wear resistance and antistatic properties. The laminated door does not fade in the sun and is not susceptible to chemicals.

Milling

Very widespread (especially in the manufacture of door panels and furniture facades) milling of the material – its relief finishing, which provides great opportunities for new design solutions. To perform such tasks, factories use special computer-controlled machines.

MDF doors and 3D technology

A relatively new technology, which has already become in great demand, is 3D relief MDF doors. Their canvases are voluminous veneered surfaces with the natural texture of wood preserved. Today this is the most expensive option for MDF doors of all those listed, but the high cost in this case is entirely based on the complexity of the technology and the low prevalence of enterprises for their production.

Such production takes place in several stages:

1. a project for the design of the canvas is being developed (a sketch of the drawing is created using computer technology),
2. a 3D surface is produced: the whole process is aimed at giving the source material a given relief using special equipment (in some cases, finishing is done by hand by craftsmen);
3. finishing cladding involves applying a special coating that protects the MDF board from mechanical and chemical damage and direct exposure to ultraviolet radiation (the surface can be given any texture, including fluorescent or “metallic”).

MDF doors: manufacturing technology

Interior doors are never entirely made of MDF panels. When using the standard version of the lightweight fabric design, it includes:

Controversial environmental friendliness of the material

Very often, the real “stumbling block” in choosing MDF doors is the issue of their environmental safety. There has always been a lot of controversy about this. But if we consider this issue objectively, there is simply no reason for concern in this case. The material is made from wood processing waste, but at the same time it remains the same wood that is used for the manufacture of solid wood products, but crushed, high blood pressure, heating with steam, pressing.

In the production process such chemical substances like paraffin and formaldehyde resin, which has low toxicity. To bind all components, manufacturers use lignin, which is released independently during the heating of wood. To make MDF, there is simply no need to use phenol or epoxy resins, the fumes of which are hazardous to health. Therefore, there is absolutely no reason to be afraid of installing MDF doors.

How to open a workshop for the production of interior doors

The popularity of interior doors among the population is comparable only to plastic windows. For both the former and the latter, demand is stable even during the economic crisis. But since interior doors serve not only a functional purpose (to open/close access to the room), but also an aesthetic one - they should look impressive and please buyers.

Even if you make doors from environmentally friendly materials (for example, solid wood), but do not give the model a presentation appearance, the business will most likely be doomed to failure.

What does the consumer like? Criterias of choice

Product range– a critical decision for future production. And it should be determined taking into account consumer preferences.

Main types of interior doors:

From the array

The door leaf is made of wood lamellas (solid different breeds- from soft ones, such as pine, to hard oak and more valuable ones). The bars are spliced ​​using glue and exposure under pressure, the canvas is sanded, calibrated and varnished, or covered with decorative finishing (for example, veneer of expensive species).

For premium doors, a more complex technology is possible: partial tinting, mosaic fusion, inlay are used, thanks to which the door leaf turns into a real work of art.

Wooden with veneer finishing

Doors of the middle price segment. The base is usually inexpensive wood in the form of boards, fastened into a frame, covered with veneer on the outside.

For voids use various fillers, for example, corrugated cardboard.

Laminated

When laminating, a film of various colors and textures is applied to a base frame made of chipboard or MDF. This production technology makes it possible to imitate various materials(and not only wood), but the wear resistance of such doors is the lowest among all types;

Plastic, aluminum and their various combinations

A combination of materials such as plastic and aluminum is used to equip non-residential premises (offices, medical, government, educational institutions).

According to manufacturers, trends in consumer demand can be characterized as follows: “from cheap to expensive.” Today, veneered doors are most in demand, but with a base not made of chipboard, as was the case a couple of years ago, but made of solid wood. Why?

The reasons are obvious:

• reliability – interior doors are subject to quite a large load (especially if there is a child in the house). And a solid mass always outperforms a frame structure, and veneer from hard rocks the wood will be protected by the canvas better than laminate and other film materials;
• veneer is homogeneous in structure (compared to furniture panels), so it is easy to choose the most similar doors for different rooms;
• naturalness of the material;
• price – the cost of doors made of inexpensive wood, lined with veneer, “fits” into the category of the middle price segment (about $250), but they will last much longer than frame products. And if necessary, such doors can be restored.

Organizational form and sales channels

The legal form for a business should be chosen after first assessing the potential buyer.

Here are the options:

• large wholesale - construction companies and state-owned enterprises (usually, there is a tender basis, which is quite difficult for a new player in the market to win);
• concluding agreements with networks of construction markets and specialized stores;
• sales through own retail outlets;
• dealer network.

In practice, an enterprise engaged in the production of interior doors is rarely limited to one sales option - to increase sales, all available “channels” should be developed.

Therefore, the optimal organizational form would be a legal entity - LLC (many construction companies and supermarkets simply do not cooperate with individual entrepreneurs).

The following codes must be indicated in the types of activities:

• 20.30.1 Production of wood building structures and carpentry;
• 51.53.24 Wholesale trade of other construction materials.

A license for the production of interior doors is not required. But if you plan to provide installation as an additional service, please note that without special permission, installation of door panels is only allowed in place of existing openings. If the project involves expansion or any other change in the opening, then an appropriate construction license is required.

Production technology of interior doors

Let's consider the full technological cycle for the production of interior doors made of solid wood with veneer cladding.

1. The production cycle begins with sawing wood (logs) on high-precision band sawmills, which ensures a minimum level of defects.

2. Afterwards, the boards go to a special place - a drying complex, equipped with chambers with mechanized loading. The drying process is completed by controlling the moisture content of the material.

3. Then the board is dissolved into separate bars (lamellas) of the required section. All defects are removed from the slats - material with knots, irregularities, which can affect the quality of the future door.

4. On a special splicing line, defect-free blanks are glued lengthwise into a furniture panel. The strength of the door leaf is ensured by the adhesive tenon connection of individual blanks. The glued beams are processed on four sides on milling machines to the required cross-section.

5. Gluing of lamellas along the width for the production of panels and individual door elements is carried out in vertical presses. At the stage of this operation, the perpendicular arrangement of fibers in adjacent beams is strictly controlled, which guarantees high resistance of future doors to various deformations during operation.

6. To give the load-bearing structures of the door high rigidity and stability of shape, the door leaf is covered with veneer, the production of which takes place on a separate production line.

7. To produce veneer, whole logs are used, which are pre-steamed (in a steam chamber for 3 days), and then centered and sanded on a bark trimming machine to remove the bark and bast layer.

8. Next stage - circular trimming. The log is constantly rotating, and the machine removes a thin layer of veneer from it, only 0.6 cm thick. An average log produces about 134 linear meters of veneer.

9. The veneer is then unrolled and cut into sheets. Sheets with the same fiber pattern are stacked. From these, parts are subsequently selected for external cladding doors.

10. To give the door special wear resistance, three layers of veneer are used (in the economical version, they are replaced with MDF or chipboard with one layer of veneer).

To do this, glue is applied on both sides to the middle layer of the veneer sheet and sent under a hot press. Here, at temperatures above 100 C, the middle sheet sticks tightly to the other two. After a minute and a half, the glue hardens, forming a high-strength top layer - plywood for the door leaf. This finish is made from a variety of wood species (birch, oak, beech, ash and others).

11. Veneered plywood is applied to the door leaf glued together from lamellas, and placed under a cold press for 30-40 minutes until the glue dries. Next, all components of the door structure are polished and checked for compliance in order to eliminate the presence of unacceptable gaps or differences in further assembly.

12. Next, the length/width of the product is measured. The door is sent to a machine that chamfers and cuts the edges to the specified dimensions. On the next machine, the grooves for the hinges are hollowed out.

13. A hole is cut for the door handle.

14. Then, the product is sanded and varnished and dried. All parts of the structure are assembled into one whole, equipped with fittings, packaged and sent to the warehouse.

Regulatory documents and certification of interior structures

Interior doors are not subject to mandatory certification by law, but the presence of a document confirming the quality mark and compliance with standards significantly raises the level of the manufacturer in the eyes of the buyer and creates a positive image of the company.

And in order for the doors to pass all tests, you must adhere to the recommendations and requirements specified in:

• GOST 475-78 – Wooden doors. General technical conditions;
• GOST 28786-90: Wooden doors. Method for determining resistance to climatic factors;
• GOST 26602.3-99: Window and door blocks. Method for determining sound insulation;
• GOST 26602.2-99: Window and door blocks. Methods for determining air and water permeability;
• GOST 26602.1-99: Window and door blocks. Methods for determining heat transfer resistance;
• ST SEV 3285-81 - Wooden doors. Reliability testing methods;
• ST SEV 4181-83 - Wooden doors. Method for determining flatness;
• ST SEV 4180-83 - Wooden doors. Impact test method

Raw materials for the manufacture of interior doors

In the production of interior wooden doors, you can use ready-made materials (furniture panels, plywood, MDF, veneer) or blanks (edged board, solid logs). The first option greatly simplifies the technology. The second - reduces the cost and increases profits, but requires large investments. Therefore, only large factories focused on the mass production of interior doors can afford a full technological cycle.

Medium and small businesses prefer to increase their capacity using ready-made materials as raw materials. And after the payback of the initial investment and, if possible, expansion, open a separate workshop for the production of furniture panels, veneer and other materials in the immediate vicinity of the logging site.

Premises for the production of interior doors

Basic requirements for a production workshop- dryness (a prerequisite for storing materials, products and working with wood), the presence of heating and all necessary communications, three-phase network, access roads for transport.

The size of the workshop varies depending on the volume of production and the completeness of the technological cycle. If an enterprise for the manufacture of doors from edged boards requires an area of ​​​​at least 400 m 2, then for small-scale production from a finished furniture board, 100-120 m 2 will be enough.

• heated warehouse for primary drying of wood;
• manufacturing facility;
• separate room for applying paint and varnish;
• a place for assembly and storage of finished products.

Estimated business plan

1. Renting premises

For the production of interior doors made of natural wood (oak, pine) with veneer of various types of wood, the enterprise (LLC on the general taxation system) rented a production facility with an area of ​​450 m 2 .

2. Plans for production volumes

Planned production output: 800 l.m/year

Ways of implementation:

• through our own warehouse store;
• through a network of construction supermarkets;
• on a contractual basis with construction contractors.

3. Capital costs

Equipment for the production of solid wood doors:

• drying chamber – 35 thousand rubles;
• band sawmill – 110 thousand rubles (Fig. 15);
• tenon cutter for trimming lamellas and cutting tenon joints - 170 thousand rubles;
• cross-cutting press – 220 thousand rubles (Fig. 16);
• pneumatic press for forming a shield – 180 thousand rubles (Fig. 17);
• format-cutting machine for sawing lumber – 200 thousand rubles;
• milling and copying machine – 90 thousand rubles (Fig. 18);
• grinding machine – 100 thousand rubles (Fig. 19);
• auxiliary equipment (construction tools) – 50 thousand rubles.

Equipment for the production of MDF doors

The production of doors from wood and materials made from it is one of the most promising options - for both large and small businesses. In order to open such a workshop, you will have to not only purchase a list of necessary equipment, but also become familiar with all the production nuances.

Based on the video in this article, we will discuss how the production of MDF doors is carried out; Let's look at the mechanisms by which certain technological operations are performed; and we’ll tell you what capabilities this or that machine or tool has in general.

To get quality products

If a company is engaged in the production of interior doors, then it should not be focused only on working with wood, or only with MDF. Moreover, most doors are combined: the frame is constructed from pine bars, and only then it is sheathed with sheet material. In general, for the successful sale of products, an extensive assortment is needed, covering different price ranges.

Therefore, the manufacturer must offer the buyer cheap doors without decorative coating, and elite ones made of natural wood, and the golden mean in the form of laminated and veneered products (see Veneered doors: what they are and how they are made). The task is made easier by the fact that the production equipment MDF doors, with the same success it is used for the manufacture of solid wood doors. Therefore, the list of machines and devices that we will present during our article will be general.

Preparation of material

Edged boards and timber used in door production must undergo a drying procedure. There are several ways to reduce wood moisture, and the simplest of them is natural.

But it takes a lot of time, so production uses drying chambers for this purpose. This is a stationary box with a ventilation system in which the temperature is maintained from +40 to +100 degrees.

• First, when the fan is running, the lumber is heated with steam, and then the temperature is gradually brought to the desired temperature. Since the design features of drying chambers may differ, the principle of working with them is determined by the manufacturer’s instructions.
• Warm-up time depends on the type of wood, and the essence of drying is not only to normalize moisture, but also to relieve stress from its internal fibers. Upon reaching the required percentage of humidity, the tree is not immediately removed from the chamber, but kept in it for up to three hours. If poorly dried material is used in production, the products will be deformed.

• Price drying chamber depends on its capacity, and the minimum is 2 million rubles. Not everyone has such tools, so some craftsmen make them with their own hands. A room is allocated for this, the surfaces of which are qualitatively insulated, steam is isolated with foil, a fan and heating elements are installed. Infrared film for underfloor heating is often used for this purpose, as it is very economical in terms of energy consumption.

If you wish, information on this topic can be easily found on the Internet. The main issue that will need to be resolved is the method of loading wood into the chamber. Usually this is, as in the photo, a trolley on rails, but a forklift can also be used. And, of course, you should take care of fire safety.

Equipment for calibrating and cutting material

It is clear that the wood used to make doors must be calibrated - that is, it must have clear geometric dimensions. Therefore, after drying, the lumber is processed on a four-sided planer, which is capable of processing the workpiece from all sides at once. When a block passes through it, four cutters not only level the surfaces, but also open up defective areas.

Multi-rip machines

A company that has a multi-sawing machine at its disposal can significantly increase productivity. Such equipment allows, in order to reduce costs, to purchase unfinished edged board, A round wood, and saw it yourself into boards and beams.

The capabilities of this machine make it possible to mass produce molded blanks, including from sheet and slab materials: plywood, chipboard, fibreboard, MDF, furniture board.

Note! Machines with a multi-saw system are suitable for both longitudinal and transverse processing. Depending on the type of unit, it may contain up to two dozen saws. Their layout is standard, and is very similar to a sawmill, but unlike a multi-saw machine, several workpieces cannot be made at the same time on a sawmill.

• In addition, workpieces passed through a multi-saw unit are distinguished by greater geometric accuracy. All its working elements are located on the bed, and in some models there is also a material supply line, which is a roller conveyor.
• The material supply unit is driven by an electric motor and consists of spiked shafts that ensure uniform movement of workpieces. The sawing unit can consist of several or one shaft on which circular saws are mounted. By the way, they can be located not only in the vertical plane, but also horizontally.

If necessary, the multi-saw machine is equipped with a milling mechanism necessary for processing the ends, as well as an installation for trimming edges. The equipment of the machine may vary depending on the parameters of the products that need to be obtained.

Cross cutting machines

When working with any long material, it is impossible to do without miter saws. In a small workshop, carpenters can use both manual options, but for large volumes of work you need a machine.

Trimming is the name given to cross-cutting wood materials, with the help of which the workpiece is given the shape of a rectangle and a workpiece of a certain length is obtained.

• When the enterprise has a dryer, one cross-cutting machine can be installed on the site where raw material is sorted, and the second is used for cutting already calibrated timber or boards. Such equipment has quite a lot of potential.

• In addition to trimming the ends, this is dividing the workpiece into 2 parts; identification of an area with a defect, which is automatically removed during sawing; cutting blanks of a certain length. All these operations can be performed by the machine either simultaneously or one by one. Here a lot depends on the equipment of the machine, its settings, as well as the task at hand.
• As in multi-saw machines, circular saws with teeth made of hard alloys are used here. However, they have a different sharpening angle, since the wood has to be cut across the grain. A saw with regular teeth cuts the material like clockwork, rather than tearing or crushing it.

• Since the cross-cutting cycle is periodic, the moving parts of the machine do not have time to heat up too much, so the mechanism works properly long time. The only thing, for ease of operation, the cross-cutting machine must have a convenient device for feeding workpieces. Usually this is either a conveyor or a roller table - a roller table, the price of which, depending on the length, varies between 16,000-25,000 rubles.

To ensure that when sawing there is no discrepancy between the required and actual dimensions of the products, all measuring instruments on the machine, as well as the stop ruler on the roller table, must be periodically checked and adjusted. To obtain the most accurate parameters, modern cross-cutting machines are equipped with optical instruments, which also need to be checked from time to time.

Format saw

When working with sheet wood material, which is MDF, you cannot do without a machine for format cutting. It cuts straight or at an angle: both long-length and slab materials are processed, and you can also cut a whole stack of slabs at once according to a single template.

• To do this using any other machines or tools, even if it is possible, will require a lot of time and effort, which is simply unacceptable for mass production of joinery products. In general, production efficiency largely depends on the overall functionality of machines for format cutting.
• All of them are professional, and are divided into three categories. The first group contains the most simple models economy class, with small dimensions, and without additional equipment with stops, rulers and clamps. Such machines can operate for no more than five hours at a time, and are designed for a relatively small volume - ideal for a small private workshop.

• The second category includes medium-power machines that can work a full shift (at least 8 hours) and are provided with all the necessary devices and components. In particular, they can be equipped with a dust extraction device. Well, the third option is industrial machines that have the most durable design, full equipment, electronic control circuit, and are capable of working for two shifts.
• The basis of any machine is the bed on which all working mechanisms are mounted. The stiffer and heavier it is, the less vibration and the higher the cutting accuracy. Two saw blades are mounted on the bed. There is a cutting disc in front - it has a smaller diameter, and its function is to trim the top (facing) layer on the workpiece.

• The material is finally cut by the main disk, the size of which determines the depth of the cut. This arrangement of the discs allows you to produce high-quality cuts, with smooth edges and without chips. The formatting machine has three work tables: one movable, on which a full-size MDF sheet is fed for cutting; the second support, which should support the cut off parts. The third, fixed table, on which, in fact, the saw unit is fixed, is the main one.

To cut a workpiece on such a machine, the sheet is placed on a movable table, which moves along guides with a carriage. Using the stop, measure the desired length, and start the saw mechanism. As soon as it picks up speed, the sheet is fed to the saw unit by moving the table, and a fragment is cut off. From the settings in the format machine: only the depth and angle of cut.

Equipment for milling and cutting tenons

It is impossible to imagine any carpentry workshop without a milling machine, because cutting profiles, grooves, volumetric reliefs, large-radius curved cuts, and even wood engraving is done mechanized.

The only difference is that the milling machines used in one case or another are slightly different in design. There are six types of removable tools, the use of which is determined by the need for one or another type of processing.

• Thus, a wood milling machine can be considered a universal mechanism. The height of the cutter, located on a movable vertical shaft, can be adjusted. But the position of the part being processed is limited by stops and guides.

• In a small workshop you can get by and manual router, a variant of which is presented above, but for the mass production of joinery, they use machines with software numerical control. Manufacturers offer a huge range of such equipment, which has a variety of characteristics, and is controlled by operating systems.
• With a milling cutter on a vertical shaft, you can countersink, that is, get conical holes; bore them; dado. With the help of such machines, the edges of workpieces are processed and frames are made. But mirror-symmetrical, or absolutely identical curly blanks: drawers, panels (see. Door panel: how to make and install), it is impossible to make without a copy-type milling machine.
• The door frame is most often assembled using the tenon method. Tenons at the ends of the workpieces, as well as recesses for them (eyes), can only be obtained using a tenon-cutting machine. The working mechanisms in it are also cutters and saws. Just like other milling machines, tenoning units can be equipped with CNC and controlled by a microprocessor.

• In any case, it is possible to make an oval or round tenon only on such equipment. In addition to cutting tenons, computer-controlled machines can be used to trim the perimeter of the door leaf, process calibrated sheet material, and splice bars along the length, which is sometimes necessary for the manufacture of panel doors.

Note! In addition to the basic woodworking machines mentioned above, door production will also require additional equipment with which finished panels and molded products are finished.

• This and Hydraulic Press, which is used to cover MDF door trim with veneer, and edge banding machine, by means of which narrow strips of veneer are glued to the ends of the canvases. This could include a painting booth, a press for gluing bars, a surface grinder, and a packaging machine - otherwise how to transport the products?

As you can see, the list of equipment is quite large, and it is clear that in order to equip a carpentry shop, you need to spend a lot of money. But do not forget this: the availability of machines and the necessary tools does not guarantee a quality result. Ultimately, it all depends on the professional competence of the people working on this equipment.

Interior doors made of MDF have become very widespread in recent years. After all, chipboard is a material containing urea-formaldehyde or phenol-formaldehyde resins, and wood is expensive, easily absorbs moisture, and is sensitive to fungal diseases. In addition, MDF interior doors look great, are relatively inexpensive, and also do not pose any danger to the health of people and pets - they can be installed both in the bedroom and in the children's room. Add here high strength and wear resistance, absolute inertness to environment and you will understand the reasons why MDF doors are popular.

The DEMFA company, as a manufacturer, has been producing interior doors from MDF since 1999. For painting, we use only moisture-resistant polyurethane coatings, as well as high-quality patina and water-based acrylic varnish. It is the concern for the health and wallet of the consumer that makes our products popular. The products of the DEMF company are represented by several model directions of door leaves, each of which can be further modified to suit your interior design. We are also engaged in the production of moldings and capitals, doors for the delivery of residential properties (construction doors).

We paint MDF interior doors in two basic colors: WHITE and CREAM. However, the client can choose any other shade from the RAL catalog, which offers 213 different color options. The capital and other moldings can be painted in the same color. The DEMFA company does not recognize any boundaries in terms of interior design. It is also possible to have weak and strong patination of interior doors in various shades (basic - silver and gold) - it looks very impressive!

Since the production of MDF doors at DEMFA is carried out according to a weekly planning scheme, we fulfill even large wholesale orders very quickly. As a rule, the waiting period varies from one week to a month. Moreover, in our warehouse we have a large stock of the most popular items in two primary colors (WHITE and CREAM) - if you are looking for a standard solution for an office or home that will fit into any interior design, you can pick up the ordered interior doors almost on the day order! In addition to standard models, we manufacture custom products:

• Not standard in height, width,
• painting and patination of sides in different colors,
• full or partial patination of the door leaf and moldings,
• applying drawings to the door leaf using milling technology.