Wood has the ability to stick together, and that distinguishes it from many other types of construction and finishing materials.
As a result, adhesion is obtained-in-oneconnection, and if 50 years ago it was used as a carpentry compound, the bonding is used today to improve the physical and mechanical properties of wood.
The wood - is an organic material which isIt allows bending, linear extension, torsion. He can change even humidity. Therefore, the choice of adhesive is necessary to consider that it meets all of these requirements.
Preparation of adhesive for bonding wood
Wood glued with carpenter(Mezdrovogo or bone) or universal synthetic casein glue. Most frequently used carpenter's glue, which may be in the form of granules, rings, and in crushed form. It is used both in the manufacture and in the repair of glued wood products.
To prepare the joiner's glue solutiontile adhesive must be crushed, and then fill it with water and leave for 8-12 hours for the swelling. It should cover the glue by a few centimeters. Then the water is drained, and the adhesive composition fall apart on low heat with constant stirring. To eliminate the sticking glue, it should not be tenderize directly on the fire. Dishes with the composition can be placed into another container, in which there is hot water. In order to determine that the adhesive is necessary to put it on the board and check for stickiness.
wood bonding technology
Before repairs necessary to soften and removeold glue with wood products. For this it is placed a wet cloth for a short time (about 2 hours), after which the softened adhesive is removed with a knife.
The adhesive composition dries very quickly, so you must prepare it in small quantities. Also remember that you should not add a new adhesive composition of old glue.
Before gluing the product must be gooddry. The room temperature bonding should be at 15 to 20 degrees. If it is above - the glue becomes too liquid and compressive parts, press them, if lower, the glue is very thick and will not be able to penetrate into all the pores of the details. Bonding surfaces must be smooth. If necessary, they can be treated with a plane surface, a file, and then sandpaper №100-140. There is dust removed with a brush and wipe with a cloth soaked in acetone or water.
The adhesive on the surface of the substrate must be heated to 50-60 ° C. In this case it is better to penetrate into the pores of the bonded wood. The thickness of the dry glue joint should be from 0.1 to 0.15 mm.
When gluing the product is applied directly to bothsurface. When gluing takes place along the fiber, the surface is smeared with glue 1 times, if the butt (ends) - 2 times, the second layer of adhesive is applied after the partial drying of the first layer (when touching it must be tacky and stretch in the yarn). After that, prepared for bonding parts should be connected in a vice and tighten or screw clamp. You can also pull the product bandage.
If the adhesive used is too thick, compressionneeds to be strengthened. This is necessary to reduce the thickness of the adhesive layer. Items for bonding should be compressed approximately 3 hours. Plywood is kept for at least five hours. If the product to be further processed, it is kept for 2 days.