FI60154B - FRAMEWORK FOR PLASTIC OPERATION OF PLASTIC TRACK - Google Patents

Description

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Patent- och registerstyrelsen 1 1 Antölun utbgd och utl. * Krift * n pubik «r * d 31.08.8l (32) (33) (31) Pyydetty« tuolk «u · - Begird priority 17 · θ6 · Τ ^

Norway a-Norge (NO) 7U2178 Proven-Styrkt (71) A / S Ivar Bergsmo, Postboks 176, 8U5I Stokmarknes, Norway-Norge (NO) (72) Einar K.J. Strandengen, Stokmarknes, Norway-Norway (NO) (7M Oy Kolster Äb (5U) Method for the production of plastic-protected timber -Förfarande för framställning av plastskyddat trävirke

The invention relates to a method for impregnating preformed wood articles with a plastic material.

Many methods for making plastic-impregnated timber are previously known. The wood is then impregnated with a suitable non-polymerized plastic using the usual pressure / vacuum impregnation method. The plastic is then cured (polymerized) in place in the wood by known means / methods at room temperature, by heating or by radioactive irradiation.

By making plastic, methods, combinations of plastic additives and methods, color additives, etc., many good properties can be given to wood, such as strength, stability, durability and a pleasant appearance. One of the disadvantages of such impregnation with plastic is that during the hardening process the dimensions and shape of the wood change (the wood is distorted). As a result, the workpiece has to be machined after hardening, which makes it much more difficult to machine.

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Another disadvantage is that complete impregnation with plastic becomes expensive because the cost of the process is roughly proportional to the amount of plastic consumed. Therefore, impregnation with plastic cannot be used in many areas where it would otherwise be desirable.

The invention is essentially characterized in that the interior of the article is made of a wood or plywood material or the like which resists impregnation, and that the interior is made substantially in the shape of a finished article, and that a relatively thin layer of wood is then glued to all or one or more surfaces. is well suited for impregnation, and that the whole article is then impregnated with the plastic material in a manner known per se under vacuum or pressure, after which the polymerization of the plastic material is carried out in a manner known per se. In this case, a stable and durable adhesive must be used for lamination and the cross-section of the coating to be impregnated must be small in relation to the main body, so that this is not so affected by the forces in the outer layers that its dimensions or shape change significantly.

In this method, the surfaces of the workpiece that are mainly to be protected are coated with plastic-impregnated wood (possibly colored at the same time), while those surfaces that are not coated also receive a better surface treatment than in normal painting / varnishing. Although wood cannot be impregnated, the penetration of plastic into the surface is considerably better than in conventional paving.

Po. the invention achieves the following advantages: 1). It can use a much cheaper substance in the main part of the article than with known plastic impregnation methods. 2). The object can be completely finished before impregnation with plastic. 3). Achieves better strength compared to wood that is not impregnated with plastic.

4). achieves approximately the same durability, stability, and appearance as regular, plastic-impregnated wood.

The invention is described with reference to the drawing, in which:

Figure 1 shows an example of a frame of a fixed, closed window pane. The drawing shows a cross-section through the side frame tree.

1) is a main frame profile made of spruce. 2) has an outer surface to which about 3 mm of birch is glued (veneering). 3) and 4) are inner surfaces, 3 60154 to which about 3 mm of birch is glued. In this case, the outer glass strip 5) is made entirely of birch and impregnated completely with plastic.

Figure 2 shows a block diagram of the work steps of the method.

Phase I is the treatment of wood by conventional methods, depending on the intended use of the finished timber. Step 2 is lamination, which must be done reliably with a serious adhesive with a durability equivalent to that of the product requirements. Impregnation, step 3, is preferably performed as a vacuum / pressure impregnation and with a plastic material that imparts desirable properties to the timber.

The polymerization, step 4, is controlled by known means so that the temperature does not rise too high and at a suitable rate so that no excessive stresses are generated in the lamination zone.