SU1765003A1 - Process of making wood-chip slabs - Google Patents

Abstract

Use: woodworking industry, chipboard manufacturing technology. SUMMARY OF THE INVENTION: Pressing three-layer chipboard with a thickness of 16 mm is carried out. Urea-formaldehyde resin KF-015 is used as a binder. The resin consumption in the outer layers is 13%, in the inner one 8%. In the mixer, the grinding dust is mixed with the liquid resin, and then the resulting mass is sprayed as a discrete binder into technological dry chips of the inner layer of the plate and mixed. Form a carpet. The plates are pressed at a temperature of 165 ± 5 ° C. C, the exposure time of 0.3 min / mm and a specific pressure of 2.0 MPa. 1 tab

Description

WITH

with

The invention relates to the woodworking industry, in particular to methods for the production of chipboard, and can be used in enterprises for the production of chipboard.

The purpose of the invention is to reduce the consumption of binder and wood.

In the invention, by depositing the binder on the grinding dust during the subsequent spraying of the mixture obtained, a mass of discrete particles is formed at individual points. When gluing wood particles at certain points, the bonding strength of particles is quite high and has a significant advantage over bonding in a solid adhesive film, namely, in point adhesive layers, internal stresses are practically not formed, which leads to a decrease in bonding strength in the process of chipboard production. plates

The invention is illustrated by the following example.

Samples of chipboard with the traditional method and in accordance with the invention are manufactured under laboratory and industrial conditions. The results of the research are shown in the table.

Under laboratory conditions, single-layer chipboard is 10 mm thick, format 600x600 mm, simulating the middle layer of three-layer boards. Wood particles and grinding dust are used for the boards. The degree of osmogeni - 8%. In one of the mixer chambers, the grinding dust is mixed with a liquid resin and then the resulting mass is sprayed as a discrete binder into another chamber, into which dry wood particles of the inner layer are fed, and finally

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they are mixed. Carpet formation is carried out manually. The package is pressed at a temperature of 170 ° C pressure of 2 MPa for 3 min,

Under production conditions, pressing of three-layer chipboard 16 mm thick, format 3500x1750 mm is carried out. Urea-formaldehyde resin KF-015 is used as a binder. Resin consumption in the outer layers is maintained at 13%, in the inner one 8%. In the mixer, the grinding dust is mixed with the liquid resin, and then the resulting mass is sprayed as a discrete binder into the technological dry chips of the inner layer of the plate and finally mixed. A chipboard carpet is formed, chipboard plates are pressed according to the following mode: the temperature of the press plates is 165 ± 5 ° C, the holding time is 0.3 min / mm, the specific pressure is 2.0 MPa.

EFFECT: reduced consumption

binder (resin) up to 15% and wood to

18% while maintaining the strength properties

chipboard in their production.

Claims (1)

Invention Formula The method of manufacturing particle boards, including preparing wood particles, mixing them with a binder, forming a carpet from a mixture and pressing, characterized in that, in order to reduce the consumption of binder and wood, a mixture of grinding dust with binder is used as a binder. liquid resin, and mixing with the binder is carried out by spraying a mixture of grinding dust with a liquid resin into a mixer with wood particles of the inner layer of the board.