SU926138A1 - Composition for making woodwool slabs - Google Patents

Description

I

The invention relates to cellulose-but-paper production and can be used in the manufacture of fiber boards used as building elements in furniture industry.

Known composition to obtain. . fibrous construction material, including cellulose-paper production waste, consisting of wood fiber and cellulose and a binder - an aqueous dispersion of vinyl acetate homo- or copolymerTil

The disadvantage of this composition is the use of a special binder, which leads to an increase in the cost of material.

Known composition 2, intended for the production of fiber plates, which contains sewage sludge from paperboard production, which underwent physical and chemical cleaning, waste pulp from mixed

waste and active -.il biological wastewater treatment plant.

The components are taken in the following way, mas ..:

Sewage Sludge 58 Waste Paper30

Active il12

However, this composition is economically disadvantageous because it contains recycled fiber in the middle

10 1.2 mm long, which can be used in the production of various types of cardboard.

The purpose of the invention is to reduce its cost while increasing the bending strength of the plates.

The goal is achieved by the fact that the composition, including sewage sludge of cardboard and paper production and waste fiber, as waste paper fiber contains a residue from the fractionation of waste paper with a length of not more than 0.6 mm in the following ratio of components, May. %:

Sewage Sludge Recycled Fiber 25-75

Comparative data on the strength of building fiber plates for bending (kgf / cm), formed from different composite compositions, are summarized in Table 1,

Table 1

PRI me R 1. 150 g abs. dry sewage sludge at a moisture content of 73,, with a degree of grinding, 62 SR and ash content of 33.5 and 50 g abs. the dry residue from the fractionation of waste paper with a fiber length of not more than 0.6 mm, a degree of grinding of 56 CR and an ash content of t5.6% is stirred in a mixer at a concentration of 2.5.

The resulting mass is fed into a forming box and dehydrated by vacuuming at a vacuum of mm. Hg Art. For better dehydration of the mass, polyacrylamide in the amount of 0.5 to abs is introduced into the box before serving. dry fiber ..

The molded slab humidity 75 is pressed at a pressure of 5-6 atm and dried at 150-160 s.

The resulting plate has the following characteristics: a density of 1.03 g / s, a flexural strength of 305 kg / cm, ash content 2E%.

Example2. 100 g abs. dry sewage sludge, and 100 g abs. the dry residue from waste paper fractionation, analogous to example 1, is stirred in a mixer at a concentration of 2.5%.

From the resulting composition made from the stove as in Example 1 of

the following characteristics: density 1.03 g / cm, flexural strength 355 kg / cm, ash content 2.2.

PRI me R 3. The process is carried out analogously to example 1 using 50 g abs., Dry sewage sludge and 150 g abs. the dry residue from the fractionation of waste paper. Characteristics of the obtained plate: density of 0.99 g / cm, tensile strength at bending, ZbO kg / cm, ash content of 20.6%.

Characteristics plit; obtained by the known and proposed formulations are presented in Table. 2

Table 2

59

The invention makes it possible to organize waste-free production in cardboard factories that consume waste fiber, since waste products in the form of sewage sludge and residue from the fractionation of waste paper, which is not suitable for making high-quality paperboard, are used to manufacture fiberboard.

Claims (2)

1. USSR Author's Certificate No. 6U137, cl. Since 1975. 2. The order for the development and development of a complete production line for the production of fiber plates from sewage sludge from cellulose-paper production with a capacity of 5 thousand square meters. m per day. Code 13-30, approved. Lenglavpravleniya Gossna5a USSR 03/31/80 (prototype).