Composition for soft groundwood board

FIELD: woodworking industry, in particular composition for soft groundwood board.

SUBSTANCE: claimed composition contains (mass %): wood fiber 86.7-92.5; fiber-containing precipitate 9.6-3.8; paraffin emulsion 2.5; and sulfuric acid 1.2; wherein ratio of wood fiber and fiber-containing precipitate is 90-96:10-4, respectively. Fiber-containing precipitate used as wood raw material represents waste from wet method for production of soft groundwood board and sulfate method for production of cellulose.

EFFECT: method for production of soft groundwood board with reduced prime wood mass consumption without deterioration of characteristics.

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The invention relates to chemical technology, in particular to the manufacture of soft fiberboard wet method.

Known composition for soft fiber boards containing wood fiber, wax and sulfuric acid [Rebrin S. p., Merav DU, V.N. Evdokimov. Technology hardboard. - M.: Forest industry, 1982, pp.272].

A disadvantage of the known compositions is the high content of conditioned pulp

The technical result of the invention is to reduce the flow of conditioned pulp without changing the quality of the finished soft fiberboard.

The technical result of the invention is achieved in that the composition for soft fiberboard as part of raw wood contains voloknistihm precipitate obtained by mechanical treatment of industrial effluents of pulp and Board industries, with a mass ratio of wood fiber and volocesanomaderno sediment (90-96):(10-4), respectively, in the following ratio, wt.%:

Wood fibre 86,7-92,5

Sediment voloknistihm 9,6-3,8

Emulsion paraffin 2,5

Sulphuric acid 1,2

Voloknistihm precipitate is formed by mechanical industrial wastewater treatment pulp and Board production after their preliminary biologists who eskay cleanup.

A distinctive feature of the proposed composition is content in its composition as wood raw material volocesanomaderno sludge is waste in the wet method of production of wood-fiber plates and sulfate production method of cellulose.

An example of obtaining the composition for fiberboard

In industrial wood fibre softwood with the degree of grinding and 26, the concentration of mass of 2.3% add voloknistihm sediment [table 1] concentration 22,50 g/l at a weight ratio of 96:4; then add sulfuric acid in the amount of 1.2% by weight of the absolutely dry fiber to bring the pH to 4.2 and paraffin emulsion in the amount of 2.5% by weight of the absolutely dry fiber.

Table 1
Physico-chemical properties volocesanomaderno sediment
Name of indicatorValue
the concentration of sediment22,50 g/l
mass fraction of fine wood pulp fibers68,0%
mass fraction of other wood inclusions (scop, sawdust)0,7%
mass fraction of the mineral4,3%
mass fraction of active Il-Christ.” 27%
pH6,7

The composition is mixed, loaded into a laboratory otlivnyy machine for dewatering a fibrous carpet. Wet plate is additionally subjected to dehydration in laboratory press, cold pre (to a moisture content of not more than 60%) at specific pressure of 0.3 MPa for 3 seconds Then the plate is dried in drying chambers for 3 h before the humidity at more than 3%. From the obtained slabs cut samples in accordance with GOST 19592. Water absorption plates define a through 2 h after keeping them in water at a temperature of 20°C. Verification of Flexural strength is produced on the test machine according to GOST 7855-74.

Physico-mechanical properties of soft fiberboard, obtained from the compositions of different composition, are given in table 2.

Table 2
The compositions and the performance of wood-fiber boards
TrackMass fraction in the composition, %Physico-mechanical properties of fiberboard
 wood fibresediment voloknistihmparaffinsulfuric aciddensity, kg/m3/td> water for 2 h %humidity, %the ultimate strength in static bending, MPa
offer92,5the 3.82,51,2157,732,83,60,51
offer89,66,72,51,2162,232,6the 4.70,45
offer86,79.62,51,2170,832,85,20,42
known96,3-2,51,2145to 33.84,20,42
The value of indicators in accordance with the requirements of GOST 4598 for plates brand M 3100-200≤34≤12≥0,4

Composition for soft wood-fibre boards, including conforming wood fibre, voloknistihm sludge, paraffin and sulfuric acid, characterized in that as part of raw wood contains voloknistihm precipitate obtained by mechanical treatment of industrial effluents of pulp and Board about what svoystv, when the mass ratio of wood fiber and volocesanomaderno sediment 90-96:10-4, respectively, in the following ratio, wt.%:

Wood fibre 86,7-92,5

Sediment voloknistihm 9,6-3,8

Emulsion paraffin 2,5

Sulphuric acid 1,2



 

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