Today, not a single industry can operate without the use of plywood. This multilayer material made of veneer, having a strong and stable structure, found wide application in construction and furniture production, when carrying out repair work and even in the automotive industry. To connect plywood sheets together or attach them to a concrete floor screed, you can use various fastening materials, but the most convenient of them is plywood glue.

Features of using glue for plywood

The composition for gluing plywood, which many foreign and domestic companies are working to improve, can be purchased at any hardware or construction store. Using glue, you can attach plywood to glass, concrete, wood, metal and other materials, and the connection will be stronger and more durable than using nails or screws.

To work with glue, no special training or special professional skills are required. The main thing is to act according to the instructions, dilute the composition correctly and apply it to the surface, and any novice master can do this.

In addition to ease of use and strength of the resulting structure, another advantage of the adhesive joint is resistance to wetness and high wear resistance.

In rooms with warm floors when heating pipes or special electrical panels, gluing plywood to a concrete floor is the only the right decision, since screws and bolts can damage the wiring.

How to glue plywood

Professionals use the following types of plywood glue:

• two-component polyurethane;
• alcohol based;
• water based.

The speed of repairs and the quality of the finishing coating depend on the choice of the most suitable adhesive composition.

Two-component adhesive contains two or more active components, which during operation react with each other and form a binder. Such products are much more expensive than one-component compounds, but the strength of the resulting compound is incomparably higher.

Polyurethane adhesive forms both an elastic and rigid connection and provides good adhesion to almost all existing materials.

Advantages of a two-component adhesive composition:

• no additional fixation of plywood to the concrete screed with bolts or screws is required;
• the viscous mixture does not spread, it is convenient to apply it using a comb spatula;
• before work, you do not need to worry about the special cleanliness of the base, since the composition saturates the surface to be treated well;
• 30 minutes is enough for gluing materials.

One of the significant disadvantages of the polyurethane compound is the release of substances hazardous to human health, which occurs when working with any polymers. After complete polymerization, which takes 48 hours, the material becomes completely safe.

Polyurethane glue hardens within 30-40 minutes, so you should prepare such a portion of the adhesive that you can use it up within this period of time.

The resulting connecting layer is stronger than concrete and can withstand temperatures up to +55°C.

This type of adhesive differs from others in the content of artificial resins, rubber and solvents and is used for gluing plywood to a wooden or cement-sand surface. The advantages of alcohol compositions are ease of use, high drying speed, and resistance to moisture penetration.

Rubber glue hardens relatively quickly - after a day you can already walk on the glued plywood surface. However, it is better to postpone further work on finishing the floor for 5-6 days. Before gluing the wood sheets, it is advisable to secure them to the base with screws.

Alcohol adhesives have a significant drawback - during operation they emit harmful volatile oils and esters and can quickly catch fire. Therefore, when carrying out repairs using alcohol glue, you need to take care of the means personal protection and follow fire safety rules.

Water based adhesive

A prominent representative of such adhesive compositions is PVA, consisting of polymers suspended in an aqueous environment. In addition to the fact that such adhesives are capable of providing strong elastic connections between plywood sheets and with each other concrete slabs, they are completely harmless and do not emit odorous substances. PVA glue can be used in hospitals, kindergartens and other institutions where people may remain during repairs.

It is recommended to use PVA only for moisture-resistant plywood, and the drying time of the composition is 7 days, which greatly complicates the work. In addition, when choosing this means for gluing plywood, it is necessary to secure the sheets to the screed in advance using bolts and expansion dowels.

Review of adhesive compositions from well-known manufacturers

Many foreign and domestic producers They produce glue for plywood. Each of the compositions fully performs its functions, and they differ from each other only in the environmental friendliness of the raw materials, the combination of strength and elasticity, and the duration of polymerization.

Here are some of the most popular items of two-component plywood adhesives among buyers.

1. Sipol 9. Manufacturer: Italian company Lechner. Epoxy-polyurethane adhesive is used for laying plywood on a concrete floor without additional fasteners. The hardening time is 2 hours.
2. Parketolit 1549. This one adhesive composition developed and produced by Mitol specialists from Slovenia. Polyurethane adhesive is suitable for laying solid wood of any size. Working time – 1.5 hours.
3. Ibola R 200. The German company Ibola produces a two-component universal hard-elastic adhesive, working hours which is 1 hour.
4. Stauf P.U.K. This adhesive composition from the German company Stauf is an elastic polyurethane adhesive. Thanks to its low cost and long (1 hour) working time, it has become a well-known brand in this country.
5. SikaBond-PU. The Swiss company Sika produces a two-component adhesive that is characterized by a long service life and resistance to low temperatures. This adhesive is very popular in Russia, as it has been characterized by high quality and stability for many years.

When starting to repair the floor in your apartment, first of all you need to analyze whether it will be possible to get by by simply gluing plywood onto a concrete screed or whether you will have to arrange additional fasteners. Depending on the solution, you should choose a suitable adhesive composition. If, due to communications located under concrete, it is not possible to use dowels and screws to fasten plywood and the base, then suitable for work only two-component polyurethane adhesive. In other cases, you can use a water- or alcohol-based adhesive.

The procedure for gluing plywood yourself is as follows:

• Treatment of joints and the adjacent surface of the material in order to degrease and remove residual dust and dirt.
• If you want to glue laminated sheets, the next step is to sand the material to get rid of the slippery laminated surface over the entire joint area. Or make it rougher.
• Before gluing, take care to thoroughly dry the sheets.
• Apply glue to the adhesive surface using a roller for greater uniformity of the product.
• Apply special clamps to ensure a fixed and tight fit of the parts to be glued.

  How to glue plywood sheets together

  Attention! When gluing large parts additional connection is required using self-tapping screws and/or nails.

• Remove excess glue using a rag or knife.
• After the adhesive has completely dried, remove the clamps.

Are you ready to start solving the problem in a practical way? Then prepare the following materials and tools:

• Nails and/or screws;
• A sanding machine with an appropriate attachment or sanding paper;
• Clamps;
• Hammer;
• Rags;
• Glue;
• Roller.

What glue should I use?

To answer this question correctly, first decide how large pieces of plywood you want to join and how to use it after gluing.

For gluing construction (rough) plywood that does not have a facing layer, any adhesive composition is suitable. The main thing when joining is to clean and degrease the surfaces of the sheets to be glued together as efficiently as possible.

When gluing large sheets to each other after applying the glue, the workpieces are pressed using temporary clamps.

If, when gluing plywood, it is important not to disturb the texture and color of the material, but to ensure reliable connection, we recommend using PVA if the blanks will be used indoors in the future. If we are talking about external use, then epoxy or phenol would be ideal.

To ensure a strong and reliable connection of workpieces, it is important not only to choose the right glue, but also to use it correctly. Because violation of technical regulations is fraught with the risk of all the qualities of the adhesive composition not working.

• Easy to use, suitable for household needs;
• Provides reliable fastening;
• Resistant to moisture;
• Inert to the effects of fungus and mold;
• Color and composition that do not disturb the composition.

Which glue is better: based on liquid glass or polyurethane?

A universal adhesive composition based on liquid glass, guarantees high moisture resistance of the adhesive joint, as well as inertness to sudden temperature changes. This composition is ideal for gluing plywood to the floor, fiberboard or chipboard, as well as tiles or glass.

Polyurethane-based adhesive is moisture-resistant, does not deteriorate under the influence of ultraviolet radiation, provides excellent sound insulation, and dries quickly. Two-component polyurethane adhesive suitable for gluing laminated or varnished surfaces.

Selecting glue based on plywood brand

Here it is important to proceed from the category of joint strength that needs to be obtained, as well as air humidity during further operation of the structure.

If the product after gluing will be in a well-dry and ventilated area, then synthetic glue, PVA or protein-based glue will be perfect.

For plywood products that will be used both inside and outside, use synthetic glue.

Moisture-resistant plywood is better bonded with compounds based on urea resin.

How to glue plywood

How to glue plywood

Most modern floor coverings laid on a bed, and not directly on concrete. One of the most popular types of substrate is plywood. It is attractive due to its ease of installation and at an affordable price, we should also not forget about the important fact that This - natural material . Its popularity is evidenced by the fact that manufacturers began producing moisture-resistant type for use in bathrooms. Also, the sanded variety on one side is gaining great popularity, which facilitates installation under the final floor covering.

Choosing the right substrate is not enough, the main thing is to choose good glue for gluing plywood to concrete. It depends on it how firmly the sheets will stick to the floor, how quickly everything will dry and you can move from preliminary work to final work.

Types of glue

Huge assortment presented on the shelves construction stores, can be divided into several main types:

• water based;
• polyurethane;
• epoxy.

These types of glue for plywood on concrete floors differ in price , composition, consumption and drying time.

PVA glue for plywood

Water-based, it is also called water-dispersion (the most popular in this series is PVA) and has a number of undeniable advantages: safe, non-toxic, affordable, suitable for moisture-resistant plywood, it can even be applied to a damp screed.

But besides its advantages, it also has its disadvantages:

• takes a long time to dry (up to 7 days for large volumes);
• only suitable for interior works in heated rooms (there is an option marked D with frost-resistant additives, but its price is much higher);
• the fastening of the base to the flooring is not very strong, so the sheets must be screwed with self-tapping screws until they dry completely;
• When using this type of glue, the floor must be fairly level, the difference cannot be more than 2 mm.

Polyurethane adhesive has high strength, viscosity and ductility. It can be either two-component or one-piece.

Two-component adhesive for plywood on concrete floors has a high viscosity (applied with a comb trowel). This is both an advantage and a disadvantage. On the one hand, it sets in literally half an hour, but on the other, it cannot be prepared in large portions “in reserve,” as it quickly dries out and becomes unusable.

The solid version takes much longer to dry, so it does not harden during installation. Complete drying takes 36 - 48 hours, and the strength of the resulting layer exceeds concrete and can withstand changes up to +55 °C.

Installation of plywood with glue

The disadvantages include:

1. high toxicity, but harmful substances are released only during installation, after hardening it becomes safe;
2. two-component mixtures harden too quickly, which creates inconvenience during the work process.

Epoxy adhesive for plywood on concrete floor , also consists of two components that must be mixed before installation. Complete drying occurs after 4-5 days, but you can walk on the plywood covering within a day.

Read the topic: how to properly lay plywood on a concrete floor.

When laying, harmful substances are also released into the air (due to the alcohol base, the smell is rich and pungent), so you need to work in compliance with safety precautions. IN mandatory Safety glasses, gloves, and a respirator must be present, no matter what adhesive you used to glue the plywood to the concrete floor.

But there are a few general rules:

1. The concrete must first be cleaned of residues. construction waste and other contaminants (if necessary, vacuum or wet clean).
2. It is advisable to prime it before work - this will reduce the consumption of raw materials and improve adhesion to the surface. For these purposes it is suitable as a primer (regular or water-repellent, for damp rooms), as well as the glue itself. It must be diluted and applied thin layer onto the prepared surface.
3. Although only PVA and its water-based analogues require additional fastening, when working with the rest, for better adhesion, it is also advisable to press the sheets with something to the floor (put them under pressure) until completely dry.
4. It is best to cut the sheets into 0.5x0.5 squares, so they will fit better without creating cavities in uneven areas. Place such squares in checkerboard pattern, or simply with an offset.
5. It is necessary to leave a technological gap of 2 - 5 mm between the sheets.
6. Depending on the condition of the surface (cracks, unevenness, contamination) and the selected type of glue, the consumption will be 0.5 - 1.5 kilograms per square meter.

Laying plywood on a concrete floor

The PVA label often says “consumption from 0.25 kilograms per square meter,” but don’t get your hopes up. This type of glue must be used to cover not only concrete base, but also applied to the sheet. Therefore, when calculating consumption, the numbers indicated on the label should be multiplied by two.

Price

Glue for plywood on concrete floors can be purchased at any hardware store.

The most affordable option will be the water-based option.

What glue is best for plywood

PVA will cost somewhere around 60-100 rubles per kilogram, depending on the region and volume of purchase. Polyurethane and epoxy are approximately the same in price, but are an order of magnitude more expensive than water-based ones. Here the price per kilogram will be from 200 to 600 rubles, depending on the manufacturer and region.

When working, you should remember that incorrectly selected adhesive for plywood on a concrete floor can significantly complicate the installation process and significantly worsen the result.

Detailed information in this video.

It is very important that the floor in the apartment is warm and comfortable. Therefore, its installation begins with laying plywood, which will act as a base and can ensure its stability and strength. This material, consisting of several layers of veneer made from wood coniferous trees, is predisposed to various types of fastening. It can be mounted using screws, nails or bolts. But if you choose glue for this purpose, the work will be much simpler and the result will be of high quality.

General questions

To the question whether plywood can be glued, today there is a clear positive answer. Since developed various types glue, which, when selected correctly, can be used to glue plywood to any base. It will firmly connect to concrete, wood, plastic and even metal. Gluing is a fairly easy manipulation that can be done by anyone without any prior skills. Such a floor will be resistant to moisture and will not age. This technology can also be used when installing heated floors.

Dispersion glue

On modern market There are several types of different glues. In order to figure out which one is suitable in a particular case, you need to consider their characteristics.

When deciding which glue to use for plywood, you can choose an environmentally friendly dispersion glue that is odorless and has no harmful fumes. People call it PVA glue. It consists of a white suspension, which includes crushed particles of polyvinyl acetate and water.

It qualitatively connects the plywood to the base. But, despite all the above advantages, it also has a number of disadvantages. These include:

• mandatory additional fastening using dowels and self-tapping screws;
• hardening for at least 1 week.

Before use, dilute with water or add a special primer to it. For gluing 1 sq. m of plywood you need a little more than one kilogram.

To the question whether it can be used in children's institutions, offices, apartments - the answer is definitely positive.

Alcohol glue

If you need to do the work quickly, then for installation use one-component glue, which is also called alcohol glue. It is based on artificial resins and solvents, so it has a strong, pungent odor that requires the use of a respirator when working and long-term ventilation of the room. Before applying it concrete screed must be primed. Additional fastening is desirable. But at the same time, this glue has a number of advantages:

• under normal conditions it dries after three days;
• due to its consistency, it fills cracks and leaves no voids, thereby compacting the rough base;
• does not crack during operation, due to its high elasticity when frozen.

Has higher consumption square meter than dispersive. You need about one and a half kilograms.

Two-component adhesive

Laying plywood with two-component glue will be quick and problem-free. Having a higher cost than analogues, it has a number of advantages, including:

• plywood does not need to be additionally secured with self-tapping screws;

• the glue hardens in just two days;
• has the greatest strength.

This adhesive for plywood flooring is sold in the form of two separate components - a resin and a special hardener, which must be mixed in the correct proportions immediately before use. It is recommended to work with the material using individual means protection.

Technology of adhesive laying of plywood

To ensure correct installation and fixing the material onto the screed from the solution, it is necessary to glue it. This ensures the coupling of two various surfaces, which guarantees good quality laying the preparatory layer of the floor (this process is shown in the video).

Installation should be carried out in the following sequence:

1. An adhesive composition of about 2 mm is applied to a pre-prepared flat surface.
2. Next, the wood adhesive material, cut into squares, pre-numbered, is placed, each in its place.

   What is the best way to glue plywood?

   To eliminate air, you need to roll over the squares, pressing them.

3. We carry out the final fastening by placing self-tapping screws around the perimeter of each tile, which should be much longer than the thickness of the sheet (see photo).

After processing the rough surface with a grinding machine, we glue the tiles onto the plywood, having previously cleared it of debris, primed it, coated it with an adhesive and prepared it for laying the tiles directly. We glue parquet in the same way.

Wallpaper is one of the most common materials for wall decoration. They are attractive, stylish, and gluing them does not cause any particular difficulties. Wallpaper can be glued even when the general renovation is completely completed, without fear that finishing materials the floor or ceiling will be damaged. The canvases are demanding on the base; they can only be glued to a previously leveled surface, since their small thickness will make any wall defects clearly visible. One option for leveling is plywood. This material is characterized by rigidity, strength, stability, its surface is as smooth as possible. Is it possible to glue wallpaper onto plywood? Yes, this option is sometimes used, although plywood requires preparatory work to make the wall as attractive as possible.

Scheme for marking the wall before wallpapering.

When decorating walls with plywood, you must remember that wood is subject to temperature and humidity expansion. Therefore, you need to choose only moisture-resistant slabs and ensure special clearances during installation. You can use any wallpaper for plywood, but its texture will affect the quality of the wall preparation. The best option are non-woven wallpaper that perfectly disguises irregularities and joints. But with thin ones paper wallpaper you will have to tinker a little, the plywood wall should acquire the perfect appearance. Only after this can work begin. Attention should also be paid to the glue, which should be designed specifically for working with wooden surfaces. Before gluing, a primer is applied to the surface.

Necessary tools for wallpapering walls.

To quickly and efficiently glue wallpaper onto plywood, you need to prepare the following materials:

• waterproof primer;
• putty (alkyd enamel for rough and non-waterproof plywood);
• brushes and rollers;
• metal spatula;
• sickle tape, metal perforated corners;
• wallpaper glue;
• wallpaper;
• metal ruler;
• a simple pencil;
• knife with replaceable blades.

Preparation for gluing

The scheme for gluing wallpaper on plywood sheathing is simple, but it must first be prepared. This is due to the fact that the coating has its own characteristics. It can cause the wallpaper to begin to lag, warp, and bubble.

For wall cladding, it is best to take waterproof plywood; so-called bakelite or American plywood is excellent.

Scheme for wallpapering walls.

Such sheets are less susceptible to temperature changes than others.

Under no circumstances is low-grade plywood allowed, which has visible defects or delamination of the end part. All these disadvantages will quickly appear after wallpapering; the covering will have to be removed.

Sequence of work

Before gluing wallpaper, you need to properly prepare the surface of the walls:

1. When fastening the sheets, the screws should be literally sunk into the wood so that the caps in no case protrude above the surface. After this, all fastenings are processed special compounds against corrosion, otherwise rusty spots will quickly appear on the surface of the canvas.
2. After installation, plywood must be covered with a layer of primer. The composition must contain special anti-mold additives. This is especially important for vinyl wallpaper.
3. The joints between individual plates must be sealed with putty, otherwise they will be visible through the canvas, especially paper. The same applies to any defects, including microcracks, knots, and nail marks.
4. After the putty has dried, it is necessary to sand the surface and coat it with primer again.

Scheme of wallpapering procedure.

It is best to use non-woven wallpaper for a plywood wall. They perfectly mask various defects, since the canvas is quite thick.

How is plywood prepared? Plywood after covering the wall has seams between the individual slabs and fastening points. All such joints and fastenings must be sealed, otherwise they will be clearly visible. If rough plywood was used for work, the walls are first sanded and then cleaned of dust. Next, they are covered with a moisture-resistant primer, all joints and fastening points are puttied.

When the mixture has dried, it is necessary to sand the surface again so that it becomes perfectly flat and smooth. If non-moisture resistant plywood was used to cover the walls, it is recommended to paint the wall with a special alkyd enamel, water cannot be used. If waterproof plywood was used for the work, then after all the mixtures have dried, the walls must be treated with a regular vacuum cleaner, which will collect all the dust so that it does not interfere with the adhesion of the glue.

Pasting process

Rules for wallpapering.

Don’t forget about puttying; for this you need to use waterproof putty and sickle tape. The plywood is attached to the wall with self-tapping screws, so you only need to use galvanized fasteners, the heads of which are additionally processed. If this is not done, then over time rusty stains will appear on the surface, which will appear through the wallpaper; there is no way to remove them.

The putty is applied to the joints and fastening points, then carefully leveled with a spatula. After this, it is necessary to apply serpyanka to the still wet mixture, for external and internal corners you need to use special perforated metal corners. Then the surface is again covered with a thin layer of putty, which must dry.

After this, you can start gluing wallpaper. First you need to lay out the material on the floor, protected plastic film. Then dilute the wallpaper glue with water in full accordance with the manufacturer's instructions. The gluing process depends on what kind of wallpaper on plywood was purchased. If non-woven fabrics are used, then the glue is applied only to the wall, for others - only to the canvas. This must be taken into account, otherwise the wallpaper may become covered with bubbles, swell, or warp. There is nothing complicated here, manufacturers indicate the conditions for wallpapering, you just need to pay attention to them.

You need to start gluing wallpaper on plywood, stepping back a little from the far corner. It will be glued separately; here, not the whole canvas is used, but a small part of it. The same applies to places above window and door openings.

How to glue plywood together: rules and methods of adhesive bonding

All of them are glued last, along with niches and complex parts. After the wallpaper is completely glued to the plywood, you need to leave the walls to dry. To do this, it is necessary to ensure that there are no drafts in the room. The amount of time for the glue to dry depends on what type of wallpaper glue was used.

To hang wallpaper on plywood, you need to properly prepare the surface, hide all the joints between the sheathing slabs and fasteners. This allows the wall to be made as suitable as possible for gluing. The wallpaper will look neat and attractive. The gluing process itself is not complicated; it consists of applying glue to the surface of the wall or canvas, after which the wallpaper is carefully glued.

Tell me the brand of glue or special adhesive tape, the cost of such materials.

Epoxy resin is an adhesive that is almost always used for gluing, for example, a wooden handle and a metal blade of a knife inserted into the wood of the handle. This adhesive is two-component and consists of a resin and a hardener. Immediately before gluing, the compositions are mixed in the proportions indicated on the packaging. Previously, it was believed that “epoxy” was the most reliable and effective means, for gluing including wood and metal. In principle, this glue belongs to the category of inexpensive materials, and therefore the price here will mainly depend on the volume of packaging. Two hundred rubles is quite possible.

If, for example, large loads are not expected in relation to the parts or elements being connected, then synthetic and rubber adhesives can also be used. The main thing here is to compress the glued surfaces well. As for rubber-based adhesives, they are easy to work with, since excess can be easily removed with a sharp chisel or knife.

Elastic glue costs about one hundred and fifty rubles per tube of thirty grams.

The use of double-sided adhesive tape is also common. The tape itself is soft, made of foam material. Thanks to the wide range, you can choose a tape that will best support the connection of the selected materials. In particular on acrylic base The tape costs about one hundred and seventy rubles for one roll. In particular, as regards the manufacturer, the manufacturer 3M is a recognized leader in this field.

To summarize, we can say that prices range from two hundred rubles to five hundred rubles for a small package.

The championship among adhesives used for gluing metal and wood belongs to the “old-timer” in this area - ordinary 88 glue. The correct name is 88N. In principle, all rubber-based adhesives are capable of reliably gluing metal to wood. IN in this case What is important is not the static nature of the dried adhesive material, which, for example, is well ensured epoxy resins, but on the contrary, the “stickiness” of the adhesive composition. This is due to the adhesive properties of the surfaces being bonded. Example: by gluing wooden blocks using PVA glues and its analogues, we achieve joint strength when the glue penetrates into the material - wood, thus “merging” homogeneous materials. But when gluing metal and wood, it should be taken into account that the glue does not penetrate the metal, but only remains on its surface. In addition, the expansion coefficient of metal and wood, when there is a temperature difference, is very different. Therefore, when gluing, you should rely on the plasticity of the glue, its “mobility”.

A number of adhesives have similar properties. It is worth mentioning "Elastosil-2" and "Patex", I have not used other brands, so I consider it incorrect to comment on their properties.

Regarding adhesive tapes, then their choice is very diverse. I didn’t pay attention to the manufacturer; I often came across double sided tape Made in China, but I don't think there's much difference. The only clarification should apply to the selection of these adhesive tapes. I advise you to buy tape made of irradiated polyethylene, the strength is simply cosmic, and besides, these tapes are always covered with high-quality non-drying adhesives.

Many experts have a question: how to glue plywood to plywood and how to do it correctly. Information about the technique of properly gluing plywood sheets has been missed, probably due to the fact that such a need arises occasionally. However, you will have to master some methods of splicing wooden sheets if you make decorative items, or want to build a boat yourself, or start getting into aircraft modeling.

Material manufacturing technique

When they talk about gluing wooden sheets, they mean either production technology of this material, or linking some fragments when creating different products. In this section we will highlight the subtleties production process.

Veneer gluing for plywood production is often done by hot gluing. On at the moment The following schemes can be distinguished:

1. The merging of the prepared veneer plates is carried out using a press no more than 8 mm wide;
2. Consecutive gluing of veneer under continuous pressure together with heat treatment. This method used to create thicker plywood - from 10 - 18 mm.
3. Multi-step gluing of blanks with cooling of the press after any operation makes it possible to increase the significant thickness of the slab. This method is used to produce sheets with a thickness of 20 mm or more.

Important! For a high-quality result, it is worth gluing the sheets one after another, because the temperature and pressure are measured. It is worth noting that such sequential pressing significantly reduces the risk of delamination of materials during processing.

But such methods are more practical for those people who want to engage in the industrial production of veneer boards or. We have to talk about the technique of joining several fragments of plywood on our own, rather than gluing plywood to plywood without the help of thermostats and presses.

Suitable adhesive solutions

There are many various options, so you should choose the one that suits your requirements as closely as possible. There are 2 main masses: synthetic and protein (i.e. of animal origin). We will tell you about the types of these adhesives.

Protein groups:

• Albumin - made from protein that is obtained from the blood of animals. This glue is used for hot gluing, because it curls at 700C. Mixes with water in a ratio of 1:9;
• Casein - consist of low-fat cottage cheese. The glue is sold as a dry powder; some time before use it must be dissolved in water and stirred well;
• Combined is a combination of albumin and casein adhesives.

Mostly, synthetic adhesives represented by resinous substances. Frequently used:

• Phenol-formaldehyde resins (SFZh-3011 or 3014). It has good water resistance and is not damaged by bacteria.
• Urea-formaldehyde resins (KF-MT, KF-Zh, etc.). Very convenient to use for making decorative elements, forging natural wood. For the reason that it provides a colorless seam.

Important! The urea-based compound contains a small amount of volatile phenols, so their use is mainly for hygienic reasons.

In fact, almost every adhesive for working with plywood contains the following components:

1. Additives that control the speed of hardening also ensure maximum adhesion;
2. Basic adhesive composition;
3. Special purpose plasticizer;
4. Filler - can be wood flour or just dust;
5. Solvent;
6. Antiseptic.

Use acids or ammonium chloride as a hardener. In order to ensure resistance to getting wet, the composition includes tanning materials (formalin, salt, copper). Alcohol or acetone is used to dilute the adhesive component, that is, so that the glue can retain its properties for a long time.

Mandatory requirements for the adhesive composition

Before gluing, you need to choose which glue to use to glue plywood to plywood, since miter gluing of plywood and some other joining technologies can only be carried out using high-quality adhesive compounds.

Therefore, the following requirements are put forward for adhesive compositions:

• The main thing is high-strength bonding of materials;
• Resistant to moisture;
• Ease of use at home;
• The absence of dangerous volatile toxins in the product after the composition dries;
• Invulnerability to the breakdown of bacteria and fungi;
• It is quite important that when using glue there is no destruction of the wood veneer or discoloration;
• When working with plywood, the glue runs out quite quickly, so price is also important.

Important! Now you will not be able to find a composition that would combine all these requirements, so you should choose according to the parameters that are more important to you specifically.

Technique for gluing plywood sheets

There are 2 ways of gluing plywood sheets - overlapping and butt gluing. What is the difference?

When gluing, the plates are aligned with their planes, thereby forming a ledge at the junction.

When splicing, it is necessary to connect two tiles end to end. It is necessary that when sealing the seam the gap is as small as possible, so it is worth adjusting the planes as accurately as possible.

Algorithm for gluing plywood:

1. The planes are designed for connection, so you need to remove all irregularities by carefully processing them using sandpaper or sandpaper.
2. Next, remove the slightest dirt by removing dust from the surface.
3. In order to ensure maximum adhesion of plywood sheets, you can additionally degrease them.
4. Next, apply the prepared glue to both planes. Important! We have already talked a little above about the fact that for gluing plywood to plywood there are various adhesives. As far as we know, the instructions for use contain information about the correct dilution and technique for applying the glue.
5. We wait a certain amount of time (duration in accordance with the type of substance), and connect them to each other.
6. Pressing the parts tightly together, secure them with clamps. It is worth placing wooden strips under them to avoid any damage to the veneer.
7. Using a rag, remove excess glue protrusions, and then set the product aside until final polymerization.
8. When the plywood has been kept under pressure for the required time (as established, the drying procedure lasts 24 hours), we proceed to remove the clamp.

When gluing strips of thin plywood, glue together 2 fairly large sheets, fitting them end-to-end. In this case, glue should be applied to the pre-aligned ends, and a strip of veneer should be applied over the seam on one or both sides.

Sheet splicing technique

There are 2 ways to splice plywood - miter jointing and butt gluing.

If over time the seam does not feel operational loads, then a butt joint is used. An example can be given when a certain number of thin sheets of plywood are glued together for multi-layer cladding of a glued plywood boat.

The process of such gluing is as follows:

• Both sides of the slabs should be carefully leveled and sanded. We recommend doing this using a router or grinding machine.
• We thoroughly degrease the surfaces.
• Next you should apply contact glue onto plywood and press the planes together.
• A seam has formed; on top of it you need to apply a fairly dense layer of glue, in which we heat a strip of fiberglass. After which it is necessary to ensure a close fit to the plywood by rolling the fiberglass with a roller.
• After the glue has dried, you need to clean the seam, removing any irregularities. To avoid a decrease in mechanical strength, you should be careful when cleaning and not damage the fiberglass.

Miter gluing of plywood is very widely used, as it ensures a complete absence of seams.

To do this, the ends of the plates are erased at an angle:

1. Initially, you need to lay the plywood sheets on top of each other, and using a jointer, begin to process the ends at an angle, producing the so-called mustache.
2. In order for gluing to be as effective as possible, the length of the mustache should be the thickness of 10-12 plywood sheets.
3. To ensure maximum flat surface, the processing should be performed in two steps: initially set the jointer knife to 1-1.5 mm, and then reduce it to 0.75 mm to smooth the plane cleanly. In case you don't have a jointer nearby, you can improve the plane by attaching a temporary backdrop made of wooden strips to it.
4. Next, after processing, we clean the mustache using a tape grinder. Initially, we go through each surface with a grain size of 40, and then we set it to 80.
5. After you have formed your mustache, you need to fold them with the processed planes together. Then apply glue and secure the plywood with clamps.
6. As is already known, the next step is to remove excess drops of glue and leave the workpiece to dry.
7. Next, remove the clamps and let the glued sheet stand for about a day.

Such a board is quite suitable for work, but, of course, it is inferior in strength to monolithic plywood.

Conclusion

We hope that the article was useful, and you now know how to glue plywood to plywood and glue, and what glue can be used for this. Of course, gluing wood veneer slabs is a rather difficult task, but with strict adherence to technique and serious attitude to work, the result is guaranteed.

Video: GLUING PLYWOOD

Despite the significant popularity of sheet wood material, many craftsmen do not have a clear idea of ​​how to glue plywood together. This is most likely due to the fact that such a need arises quite rarely, and therefore information about the technology of adhesive joining of plywood sheets is not very widespread.

However, if you are making furniture or decorative items(example - ), then sooner or later you will still have to master the basic methods. Well, if you decide to take up aircraft modeling or self-construction boats, then you simply cannot do without the skills of splicing wooden sheets.

Gluing Basics

Production technology

When talking about gluing plywood sheets, most often they mean either the production technology of the material itself, or the connection of several fragments during manufacturing various products. We will talk about splicing sheets in detail below, and in this section we will try to pay attention to the intricacies of the production process.

Most often, gluing veneer to make plywood is done using the hot dry method. These are relevant today technological schemes:

• The connection of the prepared veneer plates is carried out using a press while maintaining constant pressure in the working gap. This technology is used for the production of slabs whose thickness does not exceed 8 mm.
• Alternate gluing of veneer at constant pressure with heat treatment. By alternately joining, thicker plywood is made - usually from 10 to 18 mm.
• Multi-stage sizing of workpieces with cooling of the press after each operation makes it possible to increase a significant thickness of the slab. This technique is used to produce sheets with a thickness of 20 mm or more.

Pay attention! Gluing veneer sheets one at a time ensures a higher quality of the finished product, as it promotes the most uniform distribution of temperature and pressure. Also, layer-by-layer pressing practically eliminates delamination of the material during processing, which is also very important.

However, these technological schemes are of interest only to those who plan to engage in the industrial production of veneer boards. For us, first of all, information on how you can connect several pieces of plywood with your own hands, without the use of presses and thermostats, will be important.

Adhesives used

When choosing what to glue plywood with, you should carefully study everything available options. There are many formulations on the modern market, and therefore it is worth choosing exactly the one that will best meet our requirements.

The bulk of adhesives for plywood are represented by two categories - protein (of animal origin) and synthetic. We will talk about the most popular varieties from each category.

Protein groups include the following:

• Casein - made from cottage cheese that has undergone a defatting procedure. Adhesives are sold in the form of a dry powder; before use, they are dissolved in water and mixed thoroughly.
• Albumin - made from protein obtained from animal blood. The dry component is mixed with water in a ratio of 1:9. The glue curls at a temperature of 70 0 C, which is why albumin compounds are used for hot gluing.
• Combined– combine components of casein and albumin compositions.

Synthetic adhesives are mainly represented by resinous substances. The most commonly used:

• Urea-formaldehyde resins (KF-MT, KF-Zh, etc.). They provide a colorless seam, therefore they are practically indispensable in the manufacture of decorative elements that imitate natural wood.

Pay attention! Urea-based mixtures contain a minimal amount of volatile phenols, so their use is preferable from a hygienic point of view.

• Phenol-formaldehyde resins (SFZh-3011 or 3014). They are highly water resistant and not damaged by bacteria.

Almost any adhesive for gluing plywood includes:

• Main adhesive.
• Solvent.
• Filler: wood dust or flour.
• Additives that control the rate of hardening and ensure maximum adhesion.
• Plasticizers.
• Antiseptics.

Substances such as acids or ammonium chloride are used as hardeners, and to ensure resistance to wetting, tannins (formalin, copper salts, etc.) are added to the composition.
Photo - quick-hardening composition in a tube.

In order for the glue to retain its adhesive properties for as long as possible, either ethyl alcohol or acetone is used to dissolve the adhesive component.

Glue requirements

Many joining technologies, such as miter gluing of plywood, can only be implemented if high-quality adhesive compounds are used.

It is for this reason that the following requirements are put forward for most types of plywood adhesives:

• High quality connections of materials.
• Ease of use at home.
• No volatile toxins in finished product after the composition has dried.
• Resistant to moisture.
• Not susceptible to decomposition by bacteria and fungi.

It is very important that the adhesive does not destroy the wood veneer, and did not change its color.

The affordable price is also important, because when active work With plywood, the glue is used up quite quickly.

Pay attention! At the moment, there is no composition that satisfies absolutely all the requirements, so you will have to choose according to those parameters that are most important for you.

Gluing technologies

Gluing sheets

There are two ways to glue plywood sheets - gluing and splicing. The difference between them is as follows:

• When gluing, the plates are connected by planes, and a ledge is formed at the junction.
• Splicing is used when it is necessary to connect two slabs end to end. In this case, they usually try to fit the planes as accurately as possible so that when sealing the seam the gap is minimal.

We glue the plywood using this algorithm:

• The planes intended for connection are carefully processed using sandpaper or emery, removing all irregularities.
• We dust the surfaces, removing the slightest dirt.
• To ensure maximum adhesion, plywood sheets can be additionally degreased.
• Apply the plywood glue prepared according to the recipe to both planes.

Advice! As we noted earlier, there are a variety of adhesives. As a rule, the instructions for use contain sufficient information on proper breeding and adhesive application technologies.

• Let the applied adhesive remain in place for some time (the duration depends on the type of active substance), after which we connect the plywood strips together.
• Pressing the parts to be glued tightly against each other, we fix them with clamps. To avoid damage to the veneer, wooden strips can be placed under the clamps.

• We remove any excess glue that has emerged using a rag, and then leave the parts until the composition is completely polymerized.
• After keeping the plywood under pressure for the set time (as a rule, the drying process takes about a day), remove the clamps.

Advice! To avoid delamination, it is advisable not to subject the adhesive joint to stress for at least 24 hours after removing the clamps.

By gluing strips of thin plywood sometimes connect two quite large sheets, adjusting them to each other “butt”. In this case, glue is applied to the pre-aligned ends, and a strip of veneer is placed over the seam on one or both sides.

Plywood splicing

Two technologies are used for splicing plywood - miter jointing of plywood and butt gluing.

A butt joint is used if in the future the seam between the slabs will not experience operational loads. An example is a situation in which several sheets of fairly thin plywood are spliced ​​for multi-layer laminated cladding. plywood boat.

The technology for such gluing is as follows:

• The ends of both plates are carefully aligned and polished. The most convenient way to do this is with a router or stationary grinder.
• Thoroughly degrease surfaces.
• Apply contact glue to the plywood and press the planes together.
• On top of the resulting seam we apply a fairly thick layer of glue, into which we embed a strip of fiberglass. We roll the fiberglass fabric with a roller, ensuring its tight fit to the plywood.
• After the glue has completely dried, we clean the glued seam, removing as many irregularities as possible. When cleaning, we try not to damage the fiberglass so as not to reduce the mechanical strength of the connection.

Miter gluing of plywood ensures almost complete absence of seams, and therefore is used very widely. To do this, the ends of the connected plates are cut at an angle:

• At the first stage, we lay the plywood sheets on top of each other, and using a jointer, we begin processing the ends at an angle, forming a mustache.
• The length of the mustache for maximum effective gluing should be 10-12 thicknesses of the plywood sheet.
• To ensure that the planes are as even as possible, we carry out the processing in two steps: first we set the jointer knife to 1-1.5 mm, and then to finish smoothing the plane we reduce it to 0.75 mm.

Advice! If you don't have a jointer at hand, you can improve the plane by attaching a temporary backdrop made of wooden strips to it.

After processing, we clean the mustache using a belt sander. First we go through all the planes with a grain of 40, and then - 80.

• Having formed a mustache, we fold them with the processed planes facing each other. Apply glue and secure the plywood with clamps.
• As in previous cases, remove the protruding drops of glue and leave the workpiece to dry.
• After removing the clamps, keep the spliced ​​sheet for 24 hours.

Of course, the strength of such a connection is inferior to monolithic plywood, but such a slab will be quite suitable for work.

Conclusion

We hope that thanks to this article, you will no longer have questions about how to glue plywood on edges and butt joints, as well as what glue can be used for this. Of course, gluing wood veneer slabs is a labor-intensive task, but with a serious approach and strict adherence to technology, the result can be considered guaranteed.

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