Thin sheets of plywood seldom happen without longitudinal cracks on the ends. Stratification is caused usyhaniem a tree soon after file cutting on plates or in the course of storage and transportation in the conditions of variable humidity. Practically cracks are inevitable. Usually face edges of each sheet strengthen narrow strips of a paper on glue at plywood factory, but also these measures no means always protect plywood from stratification.
Before selecting drawing and to prepare plywood to sklejke, it is necessary to eliminate cracks by tightening, and then to strengthen its prosticky lengthways narrow strips of a thin paper. .
For this purpose plywood sheet put the right (obverse) party up and palms shift the cracked parts. Usually it is possible without effort. Then plywood sheet in such position press on a table something heavy, for example, an iron. Then on a narrow strip of not thick paper, it is possible newspaper, but without a typographical paint, apply a thin film dense joiner's glue, maintain it on air a little and accurately impose a strip on a crack, smoothing, that it was not formed folds. In an hour sklejka will dry up.
Happens that crack edges do not converge or their rapprochement demands the big efforts. Then both parts of plywood humidify and after that make all other operations. However in this case after a label of a paper strip a seam it is necessary zapressovat before full drying of plywood, having put on it something heavy or having clamped between two plates by means of clamps. .
In work on decorative veneering it is necessary to resort to sklejke two or more pieces of plywood on length, edge to edge, an edge to an edge. This process is called as a coupler, or rebrosklejkoj.
That in seams it was not formed backlashes, edges of sheets plane fugankom, having clamped all pack between two plates in a vice or clamps. It is possible to manage a plane, and two-three sheets adjust one to another by means of a chisel.
For this purpose sheets impose one on another, level the edges which are subject to pasting, and on a ruler cut off a chisel narrow strips of the minimum width, no more 2 mm. A chisel establish a facet to a ruler, but with such inclination of the handle to the right that the cutting edge has had at right angle to a plywood plane. The chisel should be inclined also from itself to cut not in all width of an edge, but only a forward corner. It is convenient to use a metal ruler then the chisel can be put a plane to its edge, without inclining. The thickness of a metal ruler can be 2-3 mm, and wooden - 4-5 mm. .
To Check up a square a corner of an edge of thin sheet as it do during planing bruska, it is impossible. Therefore accuracy scraps at right angle depends only on chisel position.
At folding of two sheets for scraps of edges it is necessary to consider a direction of fibres. If they settle down not in parallel edges, and at an angle the cutting direction should coincide with a direction of fibres. Otherwise are inevitable skoly wood. Some breeds of a tree, for example red, in general hardly give in equal a scrap even along fibres, they are painted, edges turn out rough. They can be levelled a skin. Sheets clamp between two otfugovannymi plates just as at planing of edges, and smooth out a fine-grained skin.
Fragile, friable wood cut for some passes by a chisel. At first plan to risk, densely pressing a facet to a ruler. At the second pass make an incision fibres and only at the third pass do a cut on all depth.
Rebrosklejka is carried out approximately the same as and sklejka at a coupler of cracks. For sklejki and all other works with decorative plywood joiner's glue, as other glues including kazeinovyj, can leave on a wood surface incorrigible stains is recommended only. To grease a paper tape it is better not all entirely, and a wavy strip or along the edges. If on a paper tape there was too much a glue, spend the glutinous party on a sheet of paper. .
For very thin plywood liquid glue is unsuitable also. Usually apply 40 percent mezdrovyj glue and the 50 percent bone. This parity of water and dry glue: in the first case on 60 weight parts of boiled water take 40 parts of a solid, in the second - equal parts.
the Scrap manually at an angle 45 ° (or another) it is carried out in several ways. Strips with a pencil marking stack on the equal basis and press a wide ruler in position by an obtuse angle to itself. Then by all width of an edge of a chisel do an acute angle notch to prevent otkol wood right at the beginning reza, and then cut in the area of a marking for two-three passes, in the same way, as at cross-section raskroe. To prevent skoly the paper strip pasted on one of the parties which after scraps should be removed will help, preliminary having moistened with warm water. .
Not to spend time for a marking of each corner for strips, it can be drawn on an equal plane of a workbench, a piece of thick plywood, a hardboard.
It is possible to stick together longer strips and to cut them at an angle so that it has turned out simultaneously two preparations.
At last, such variant is possible also: at an angle cut out short pieces of plywood, and after adjustment in framework corners lengthen them. This reception approaches for prjamoslojnoj plywood and only more when fibres settle down not along a plywood tape, and across (for example, at pasting of frameworks).
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