Treatment of plywood

Process plywood can be different ways as the standard manual and electric woodworking tools. However, it should be noted that the glue in the plywood causing rapid wear of cutting tools, it is recommended to use the tools of hard alloys. Veneers can also be cut with modern cutting systems, laser beams and hydraulic systems. Sawing. The best result is obtained by cutting the use tape or a circular saw. To get a clean cut, cutting should be done correctly. First, cutting is performed across the grain of the front side, then go along. This method avoids the splitting angles. At best, the front side of the plywood is hand-sawn or band saw, on the other side - the disk or contour. When sawing a circular saw blade is recommended high speed and low delivery rate. Limit the penetration of teeth saw blade to be small. Drilling. Holes with smooth edges are obtained if the drill bit rather sharp and is equipped with front cutter. Drilling should begin with the front side. Splittings on the back plate can be avoided by using the lining worksheet. The use of nails. For panels to the walls, ceiling and floor are best suited nails with thread or special screws, preferably hat has been hidden or dented. For a secret nailing fit the usual wire nails. Acid nails are recommended for nailing nails exterior cladding panels, because they give better protection against rust on the surface of the panel. The length of the nails should be the thickness of 2.5-3 bar. Considered suitable interval between the nails for panels to the walls and ceiling - 10-20 cm along the edges, 20-30 cm - in the middle, depending on the load and the type of nails. In the panels under the floor of the interval should be 20-30 cm along the edges and 40-50 cm in the middle. Due to the fact that the structure of a plywood board represents the strip of veneer with a transverse fibers, the nails can score close to the edge. Considered suitable distance from the panel edge at 12-15 mm. Screw connections. In many cases, the plywood panels attached with screws. In finishing, the manufacture of furniture, exhibition stands are preferred screws. Auxiliary holes may be pre-drilled, with the hole in the panel must match the diameter of the screw and the smaller openings in the frame, the diameter of the latter will be half the previous one. Vkruchennogo screw cap should not penetrate the face veneer. If you use nails with a domed cap, you must use the washer. For attaching plywood sheathing to metal components design need special screws to secure the plywood panels on the back side without damaging the front side. Locks, hinges, shelves, etc., can be easily and securely attached to the surface of the plywood on either side or edge. The most durable is fixed with jigs. If you want to put the screws on the edges of the panels, the holes for them should be pre-drilled. Installation. Plywood can be attached to the design with glue, nails, staples, screws, rivets or bolts. When you select a mode of attachment is important to consider the operating conditions, required strength and appearance. Before mounting the plywood should be prepared in terms of the final operating conditions should be taken precautions to prevent the possible expansion or compression plate from exposure to moisture or temperature changes. Deemed necessary clearance in the joints of 2 mm. You can use an elastic filler, for example, between the edge of the panel and steel frame construction. In designs with heating is necessary to ensure adequate ventilation of the plywood boards. Kinds of connections. Joints and connections are important components of plywood structures. There are many types of connections plywood: groove and tongue, spikes, and others. If done correctly, they provide a reliable design of walls, floor and supporting elements. The ends of plywood sheets - this is usually the most sensitive part, so special attention should be given to treatment of joints, especially if the plywood is intended for use outdoors. The walls and ceilings indoors recommended butt, open, groove-ridge, seam and joint bars. Outdoors various compounds stripes represent the best protection against external influences. Vertical and horizontal profiles made of aluminum, effectively protects the edge of the plywood boards. Resistance to rust, making them suitable material for facades. Groove-ridge compound commonly used for flooring and panels that go under the roof. It effectively prevents the lifting of panels and damage to roofing materials, can withstand heavy loads than conventional butt. The panel is attached with a secret prikolachivaniya nails. Bonding. Exposed plywood is usually glued to any wood glue. The choice of adhesive depends on the method of operation, the moisture content in the final use and the strength required. Conventional types of glue: PVA, phenol, epoxy, polyurethane, etc. PVA glue suitable for indoor use. This adhesive is colorless and has a good strength adhesive. Phenol and epoxy adhesives have high strength adhesive that can withstand adverse environmental conditions. When gluing the plywood with metal epoxy adhesive is recommended type. Contact adhesives are usually used for bonding large surfaces and veneered plywood, designed for indoor use. Not recommended glue laminated plywood. Plywood, film-coating is not capable of long-term bonding. If the plywood is attached to the coated adhesive stuck to the surface must first clean up to the layer of wood, for example, using sandpaper. It is desirable that the adhesive was epoxy. Bonded surface must be clean and dry. Glue should be applied uniformly to both bonding surfaces by roller or brush. The desired pressure force is achieved by means of clips, screws or nails. Any excess glue should be removed prior to freezing. Polishing. The surface is usually polished veneer relatively coarse sandpaper (№ 80-100) perpendicular to the texture of the wood. If you want exceptionally smooth handling, for example, for high quality coating, it is recommended fine sanding paper in the longitudinal direction of wood grain. Surface finish. Polished, smooth surface of plywood is an excellent basis for further finishing. Can be laminated plywood, laminated, dyed, impregnated with special paint or solution, etc. By choosing a paint or soil solution, it is important to take into account the tendency to form cracks in the veneer veneer. Surface can be covered with laminate or veneer of valuable timber. Possible to use a thin film. Veneers can also be papered with wallpaper. If the plywood boards was stored in high humidity conditions, before finishing them must be dried to a normal moisture content. The surface should be thoroughly cleaned from dust, which appeared as a result of previous treatment. This procedure must be repeated before each stage finish. Edging. To align the edge of the slab after cutting, they can be a little trim. The best result is achieved if the rasp in a direction from the corners toward the middle, thus avoiding splitting at the corners. Edge of the panel can also be sanded. Colouring edges is 2-3 times with acrylic paint with special additives. Primer. Wood refers to the natural materials that expand and contract depending on the combined effect of temperature and humidity environment. On the inner side of the face veneer observed cracks, which expand and contract under the influence of humidity fluctuations. Because of these reasons requires pre-primer for subsequent painting. Used flexible primer, and the importance of their right combination. Painting. Application of paint gives a natural texture veneer pattern. The surface of the plate can also be painted in full, without the hassles of wood texture. Apply by brush or spray. Color plywood is acceptable for both internal and external decoration. But before final painting the surface should be treated with a special solution to prevent the appearance of blue and fungi as biological stability of transparent colors is limited because of the minimum content of binder. Varnishing. Birch plywood with lacquered surface is pleasant to look at and easy to keep clean. Before varnishing the panel surface to be polished fine-grain sandpaper. Dust, formed during grinding must be carefully removed and the surface is covered with diluted varnish.