SU390969A1 - METHOD OF MANUFACTURING OF STRAWBRAIDS - Google Patents

Description

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The invention relates to the manufacture of wood-based panels, for example, for the manufacture of panel elements of built-in kitchen and sectional furniture, as well as Partitions, shelves, walls for books and can be used in chipboard workshops and sawmills and woodworking enterprises.

A known method of making sawdust-laced plates is by pressing a three-layer carpet with a binder consisting of a middle chip layer and outer sawdust layers.

Sawdust particle boards manufactured according to a known method do not have a finished waterproof surface and require before: additional operations - veneering with veneer and surface finishing with varnish.

The aim of the invention is to obtain colored plates with a smooth, water-resistant surface that does not require finishing.

To do this, a layer of sifted sawdust impregnated with a binder solution, containing in percent by weight of urea 53-56, formalin 46-53, caustic soda 0.5-1.5, dye-acid 1-2 in a ratio of the weight of sawdust to the solution is 1.0-1.5 from 1/8 to 1/6 of the slab thickness, then wood chips with urea-formaldehyde resin are laid in a ratio by weight of the chip to resin 1: 0.1 in a layer from 2/3 to 3/4

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slab thickness, then a layer of sawdust impregnated with a binder solution, containing: as percent by weight of urea 46-53, formalin 46-53, sawdust to a binder solution of 1: 1.5, a layer from 1/8 to 1/6 the thickness of the plate, the resulting package is covered with a metal sheet; l is pressed in a press at 140-170 ° C and a pressure of 12-16 kg / cm for 1.0-1.5 minutes per millimeter of thickness, the finished plates are laid in tightly closed piles, kept, and cool them at the temperature of the shop.

According to the proposed method of making sawdust particle boards, sawdust of hardwood and softwood is sifted to remove ni, ep and bark pieces, dried to a moisture content of 10-30%, mixed with a binder solution containing urea, formalin, caustic soda, dye, taken in ratio, above, and dried to a moisture that eliminates the adhesion of sawdust. The resulting mass is placed on a pallet with a layer of a given thickness, on which a mass layer of wood shavings mixed with a urea-formaldehyde resin is laid, on which a second mass layer of sawdust is placed with a binder. The package is covered with a gasket and pressed B into a hot press under pressure at a temperature and for a time according to the mode, after which the plates are laid

in dense closed piles and stand No. x, cooled to the temperature of the shop.

Subject invention

A method of manufacturing sawdust shavings by pressing a multi-layered carpet, characterized in that, in order to obtain (color PLITES with a smooth waterproof surface, a layer of sifted sawdust read by the binder solution is contained on the metal pallet 53 -56, formalin 46-53, caustic soda 0.5-1.5, "1-2 acid diluent in the ratio by weight of sawdust to a solution of 1.0: 1.5 from 1/8 to 1/6 of the plate thickness, Then the wood chips with urea formaldehyde resin are laid in a ratio of its weight to the chips. and to the resin 1: 0.1 layer from 2/3 to 3/4 of the plate thickness, then a layer

sawdust impregnated with a binder solution containing. in percent, by weight, urea 46-53, formalin 46-53, sawdust to a 1: 1.5 binder solution, in a layer from 1/8 to 1/6 of the plate thickness, the resulting package is covered

metal sheet and pressed in the press at 140-170 ° C and a pressure of 12-16 kg / slg for 1.0--1.5 min per millimeter of thickness, put the finished plate in a tightly closed shtabel, withstand and cool them at Deha temperature .