RU2001750C1 - Method of making fiber board - Google Patents

Abstract

Usage: in the woodworking and pulp and paper industry in the manufacture of soft woody boards. SUMMARY OF THE INVENTION: a method for manufacturing wood-fiber boards, comprising preparing wood pulp by treating it with sapropel binder, carpet casting, pressing and heat treatment of boards. Waste paper or osprey is additionally added to its composition in the following ratio of components, wt.%, Wood particles: waste paper or osprey: binder - sapropel (55 - 79): (1 - 30). (1 - 20). 2 tab.

Description

The invention relates to the production of building materials and can be used in the woodworking and pulp and paper industries in the manufacture of soft fiberboards.

A known method of manufacturing soft wood-fiber boards, including the preparation of wood fiber, forming a carpet on a round-mesh casting machine, applying an antiseptic composition containing sodium salt and water, and drying the carpet, and the application of an antiseptic composition is carried out at a temperature of 40-60 ° C.

However, this method makes it possible to obtain wood-fiber boards with low physical and mechanical properties, since the glued wood pulp has weak mechanical bonds in their manufacture.

The closest technical solution for the totality of features is a method of manufacturing thermally insulating boards from wood pulp on a binder sapropel by cold pressing followed by drying, and the products after pressing are kept in a heat chamber for 5-6 hours at 160-180 ° C.

A disadvantage of the known method is the production of wood boards with relatively low physical and mechanical properties, since during cold pressing, crushed particles of wood pulp plasticized by moisture cannot come together, which leads to insufficient tightening of microspaces and the convergence of fibers by surface tension the wife.

The aim of the invention is to increase physical and mechanical properties.

This object is achieved in that in a method for the manufacture of wood-fiber boards, including the preparation of wood pulp by treating it with binder sapropel, carpet casting, pressing and heat treatment of the plates according to the invention, waste paper or scoop are additionally added to the pulp to prepare it in the following ratio of components, wt.%: wood particles: waste paper or osprey: binder - sapropel (55-79): (1-30): (1-20).

Sawdust of both coniferous and deciduous species is used as wood particles, and agricultural waste, for example, fire, can be used. Paper was used as waste paper in accordance with GOST 10700-89

or osprey formed during the production of paper and paperboard. As a binder, sapropel according to TU 10.11.860-90. The proposed method of manufacturing

fiber boards are as follows.

Example 1. Mixing of raw materials is carried out in rolls. The roll is loaded with doses of raw materials, respectively. wt.%: wood particles 55, waste paper 30 and binder - sapropel 15, at the same time pour water (up to a control mark, by level) and mix and grind the components according to

well-known technology, and then the carpet is cast on the net surface of the casting box of the molding machine. The resulting carpet is dehydrated by vacuum suction to a moisture content of less than

80%, the plate blank is pressed at a specific pressure of 0.45-0.5 MPa and subjected to deeper dehydration to a residual moisture content of less than 55%. With this, the cheese plate gains strength,

sufficient to transport it to the drying operation. The heat treatment of the boards is carried out in typical dryers at a temperature of 120-160 ° C, after which the wood-fiber board is fed for format cutting.

Examples 2-11 The method is carried out analogously to example 1. They differ in the dose of raw materials in the composition of the wood-fiber board. The technological parameters of the manufacture of plates and their recipe are presented in table 1.

The test results in order to determine the quality indicators of fiberboards are shown in Table 2.

Thus, the invention improves the quality of wood-fiber boards, while the strength, water-resistant, heat-resistant properties of the boards are improved.

These boards have low thermal conductivity, which is an important advantage of wood-fiber (soft) boards not only in comparison with solid wood, but also with other traditional thermal

insulators. To increase the biostability, hydrophobicity, and fire resistance when mixing the raw materials of the fiberboard, chemical additives can be added to its composition.

(56) USSR Copyright Certificate Nfe 1373743, cl. In 27 N 3/04, 1986,

USSR copyright certificate No. 378331. cl. In 27 N3 / 04, 1968.

Table 1

 A wood-fiber board has not formed.

Claims (1)

The claims METHOD FOR PRODUCING WOOD-FIBER BOARDS, including preparation of wood pulp by treatment with sapropel binder, carpet casting, pressing and heat treatment of boards, characterized in that when table 2 Continuation of the table. 2 the preparation of wood pulp in its composition 5 is additionally introduced waste paper or osprey in the following ratio of components, wt.%: Wood particles55 - 79 Waste paper or scrap 1 - 30 10 Sapropel 1 - 20