Composition for production of a type of soft fiberboard

 

(57) Abstract:

Usage: the invention can be used in the manufacture of products such as a soft wood-fiber plates in the wet wood and pulp and paper production. The essence of the invention: composition for production of a type of soft fiberboard contains components in the following ratio, wt. % : scop of 7.8 to 12.0; sludge from cleaning of the circulating water drevesnostruzhechnogo Department of 68.7 - 78,6; sawdust fractions of manee 5 mm 11.8 to 17.7; repellent 1,6 - 2,2. After mixing the components to produce the outflow of mass on the grid of the mold, dehydrated under vacuum and optionally pressing, the resulting carpet is subjected to drying. table 1.

The invention relates to woodworking and pulp and paper production and can be used in the manufacture of products such as a soft fiberboard.

Known composition for the manufacture of fibrous plates containing scop, representing the sediment after physico-mechanical treatment of wastewater from pulp and paper industry. Produce outflow mass and dehydration, and then perform hot pressing. 10-18 mm, the tensile strength in bending to not less than 5.0 to 8.0 MPa, water absorption for 2 hours and not more than 30% , moisture not more than 12% . However, the production of these plates requires expensive equipment (multi-storey hot hydraulic press), with the resulting plates are not used as insulating materials because of their higher density.

Known composition for the manufacture of wood-fiber plates containing crushed chips and flattened sawdust, pre-treated with an aqueous solution of ammonia at a ratio of 1: 120. In the fibrous mass is injected binder, such as albumen glue in the amount of 1% , or phenol-formaldehyde resin in the amount of 1,5-2% by weight of the absolutely dry fiber, glue the weight of a paraffin wax emulsion with the consumption of paraffin 1% by weight of the absolutely dry fiber, and as a precipitator use 2% sulfuric acid. Then produce a molded carpet on the casting machine, molded carpet is subjected to pressing by the press at 180-200aboutC for 6-8 minutes Slabs subjected to heat treatment at 160aboutC for 2-4 hours Get slabs have the following characteristics: bending strength 271-701 kg/cm2, water for 24 h 14-37,8, swelling of 7.6 is 34.0% .

Complex multi-stage technology using a variety of chemicals, as well as a large consumption of energy causing high cost products.

The known composition of the paste for the manufacture of fiberboard from waste pulp and paper production, containing, by weight. % : scop 70-90 and sawdust 10-30. Reflux was carried out in laboratory conditions on a vacuum-forming machine to form dimensions 20x20 see Cold pressing plates produced on the hand pump to a moisture content of 70% . Hot pressing was carried out in a hot hydraulic press "ihom" at a temperature of 160-170aboutWith a pressure of 1.5 MPa for 90-100 minutes of Physical-mechanical properties of samples of the plates was determined according to GOST 19592-80. The plates had the following characteristics: density 629-665 kg/m3; tensile strength Flexural 3.9 to 5.0 MPa, water absorption of 5.2 to 7.0% .

However, the resulting plates belong to the semi-solid grades, and, therefore, they cannot be used in sa for a long time leads to increased consumption of energy, that significantly increases their cost.

Research current level of technology in the field of patent and scientific and technical information sources showed that the scop and sawdust in the production of soft plates were not used.

The closest technical solution to the claimed composition on the physicomechanical properties and applied technology is a composition for the production of wood-fiber soft plates containing fibre mass of wood chips mixed with bark no more than 15% . The plates get wet by the conventional technology. Wood chips are subjected to hot, usually a two-step grinding in grinders (hot grinding - PEM), refiners (disk mills), the resulting fiber suspension is injected paraffin emulsion and the coagulant and produce ebb and extrusion, molded cloth plate is dried. The obtained fiber soft plates meet the requirements of GOST 4598-86.

Plate for brand M-1 have the following characteristics: tensile strength Flexural - average of 2.0 MPa, the density of 300-400 kg/m3, water for 2 h is the upper bound of 34% , thermal conductivity of 0.0 the value of tensile strength Flexural get soft slabs marks M-1, as well as the low efficiency of the process, so as to produce plates used chips containing not less than 85% of the wood on the mill which consumes large amounts of electricity and use of metal equipment.

The aim of the invention is to increase the tensile strength in bending of the products obtained type soft fiberboard, greening process through the use of waste from wastewater treatment drevesnoplitochnykh (sludge), drivesnapshot and newsprint paper (scop) departments, as well as the use of sawdust from sawing and felling balance on the chips. In addition, the production efficiency by eliminating costly and energy-intensive equipment for stock preparation.

This objective is achieved in that the composition for production of a type of soft wood-fiber plates containing fibre mass and repellent - paraffin emulsion according to the invention, comprises a fibrous mass scop, sludge from cleaning of the circulating water drevesnostruzhechnogo Department and sawdust fraction less than 5 mm in the following ratio of components (for abs. dry weight) wt. % : Scop 7 Repellent 1,6-2,2

Used in the proposed technical solution, the sludge is a sludge produced by mechanical cleaning of the circulating water drevesnoplitochnykh shops (DPD), the main component of which is crushed cork.

Used as a wood-fiber mass scop is a fiber from mechanical wastewater treatment drivesnapshot and newspaper production.

Used in the inventive composition get sawdust when cutting and felling balance on the chips. In the proposed composition of the used sawdust fraction of less than 5 mm

The proposed components for mass production type soft fiberboard allows to obtain products with high tensile strength - the tensile strength in bending above the average for grade M-1.

The invention is illustrated by the 12 examples, the ratio of components in which the resulting characteristics are shown in the table.

The plates produce on the following technology.

Scop derived from the mechanical treatment of wastewater drivesnapshot and newspaper production ON "Kondopogakorm", mixed with the sludge produced during mehanizirovannoju on a sieve with the hole diameter of 5 mm, in the ratios shown in the table. Later in the suspension is injected paraffin (paraffin wax) in the amount indicated in the table. All are thoroughly mixed, followed by reflux of the mass on the grid of the mold, dehydrated under vacuum, then further dewatered by pressing under vacuum suction. After removing the pressure, and disconnect the vacuum wet plate, removed from the mold, is subjected to drying. Plates have dimensions of 40 × 50 cm and thickness 8-16 mm Plates have GOST 19592-80, the results are given in the table.

From the table it follows that the composition for production of a type of soft slabs containing components in the following amounts, by weight. % : scop of 7.8 to 12.0; sludge from cleaning of the circulating water drevesnostruzhechnogo Department of 68.7-78,6; sawdust fraction less than 5 mm 11.8 to 17.7 and repellent 1,6-2,2, has a higher (of 2.20 to 2.35 MPa) tensile strength in bending, compared with an average value of the index mark M-1 according to GOST 4598-86 under other properties to the requirements of the specified Standards (see examples 1-4 of table).

Thus, the proposed composition for the production of articles such soft fiberboard, compared with the prototype, allows polysilicate not from a special fibre mass (prototype), and of waste, much of which does not contain the fibrous elements and which are still disposed of in dumps or partially burned. The composition of the paste does not contain toxic substances, which consequently improves the ecological situation not only in nature, but in the room where you will get used plates, eliminating harmful effects on humans.

(56) Steingel I. A. Use of osprey in the production of fibre boards//Scientific-technical abstract collection VNIPI-Lesprom, 1983, vol. 8, S. 14-15.

USSR author's certificate N 1008327, class D 21 J 3/00, 1983.

Katina E. C. , Gavrilidis E. A. , Axelrod, H. Fibrous plates from waste pulp and paper production. - Sat. the scientific. proceedings of VNIIM New in the production of paper, cardboard and Board. Leningrad, 1988, S. 76-82.

GOST 4598-86 "fiberboard".

COMPOSITION FOR PRODUCTION of a TYPE of SOFT wood-FIBER PLATES containing fibre mass and repellent - paraffin emulsion, characterized in that the composition contains as wood pulp scop, sludge from cleaning of the circulating water drevesnostruzhechnogo production and sawdust fraction of less than 5 mm in the following someeventhandler Department of 68.7 - 78,6

Sawdust fraction less than 5 mm 11.8 to 17.7

Repellent 1,6 - 2,2

 

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