SU1516357A1 - Method of manufacturing dry-formed fiber board - Google Patents

Abstract

The invention relates to the woodworking industry and can be used in the production of dry-formed fibreboard. The purpose of the invention is to reduce the loss of tarred fiber during carpet molding. To do this, melted tall oil pitch is applied to wood chips treated with saturated steam at 180 ° C for 4 minutes. The melt temperature is 90 ° C, the amount of tall pitch is 2.5-12% by weight of absolutely dry wood. Then the chips are subjected to grinding on the refiner in one step. A phenol-formaldehyde resin is introduced into the obtained fiber in the amount of 3% by weight of absolutely dry fiber. The tar tar is dried to a moisture content of 6-8%, after which the fibrous carpet is formed. The carpet was cold pressed and hot pressed at 190 ° C for 6 minutes at a specific pressure of 5.5 MPa. After conditioning, the finished plates are tested in accordance with Spec. 13-444-83. The loss of wood raw material is determined at the exit from the cyclones located above the heads of the forming machine. 1 tab.

Description

(21) 4368367 / 29-15

(22) 01/21/88

(46) 10/23/89. Bul M 39

(71) Leningralesk forestry engineering academy im.M.M.Kirov

(72) G, I. Tsarev, N.S.Time, I.V. Kalina and V.M. Kiselev

(53) 674.817-41 (088.8)

(56) Rebrin S.P., Mersov E.D., Evdokimov V.G. Fiberboard technology. - M .: Lesna industry, 1982, P.169.

Biryukov V.I. and other Handbook of fibreboard. - M .: Lesna industry, 1981, p.68.

(54) METHOD OF MANUFACTURING LEVEL-FIBER DRY-SHAPED PLATES

(57) The invention relates to the woodworking industry and can be used in the production of dry fiberboard. The purpose of the invention is to reduce the loss of tarred fiber when

The invention relates to the woodworking industry and can be used in the production of dry-formed fibreboard.

The purpose of the invention is to reduce the loss of tarred fiber during carpet molding.

PRI and MER 1. On wood chips treated with saturated steam for 4 minutes, put tall peck in the form of a melt (90 C) in an amount of 1.5% by weight absolutely dry (a.s.) wood Then splinter

carpet molding. To do this, melted tall oil pitch is applied to wood chips treated with saturated steam at 180 ° C for 4 minutes. The temperature of the melt is 90 ° C, the amount of tall pitch is 2.5-12 by weight of absolutely dry wood. Then the chips are subjected to grinding on the refiner in one step. Phenol-formaldehyde resin was introduced into the resulting fiber in an amount of 3 by weight of absolutely dry fiber. The tar resin is dried to a moisture content of 6-8, after which the formation of a fibrous carpet is carried out. The carpet was cold pressed and hot pressed for 6 minutes at a specific pressure of 5.5 MPa. After conditioning, the finished plates are tested in accordance with Spec. 13-444-83. The loss of wood raw material is determined at the exit from the cyclones located above the forming heads. 1 tab.

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One-stage refining of the refiner, after which phenol-formaldehyde resin is introduced into the obtained fiber in an amount of 3% by weight of a.s. the fibers. The tarted fiber is dried to a moisture content of 6-B%, after which the fibrous carpet is molded, which is subjected to cold pressing and hot pressing at 190 ° C for 6 minutes at a specific pressure of 5.5 MPa. Finished plates after conditioning are tested according to specifications. Loss of wood raw material is determined at the output

cl

from the next

from cyclojov, located above the heads of the forming machine. The test results are presented in the table.

The press mass is prepared with the following composition, wt.%:

Wood weight 95.5 Tall peck1, 5

Phenol formaldehyde resin3

EXAMPLE 2 Chip steaming, the introduction of a melt of tall pitch, spreading of chips onto a fiber, the introduction of phenol-formaldehyde resin into it, drying of the fiber, molding, cold and hot pressing are carried out as in Example 1. chips is 2.5% of the mass of wood, while the press mass is prepared with the following composition, wt.%:

Wood fiber 9.5 Tall peck2.5

Phenol formaldehyde resin3

The results of testing the finished plates are shown in the table.

EXAMPLE 3: Production of the slabs of Example 1; The amount of the introduced tall pitch per chip is 7.5%. The press weight is prepared with the following composition, wt.% :.

Wood weight89.5

Tall Peck 7.5

Phenol formaldehyde resin3

The results of testing the finished plates are shown in the table.

Example 4. Manufacturing of slabs of example 1. The amount of tall pitch introduced on the chips is 12%. The press mass is prepared with the following composition, wt.%:

Wood fiber 85 Tall pitch12

Phenol formaldehyde resin3

The results of testing the finished pl are given in the table.

PRI me R 5. Production of plates according to example 1. The number entered

five

on the chips of tall pitch is. The press mass is prepared with the following composition, wt.%:

Wood fiber 83 Talla hemp

Phenol formaldehyde resin3

The results of the test plates are shown in the table.

According to these tables, the use of tall oil pitch in an amount less than 2.5% by weight of a.s. wood does not help reduce the loss of wood fiber to the environment. With an increase in the consumption of tall pitch (2.5-12.0%), a 3-fold reduction in fiber loss is observed as compared with the known method, with preservation of the physical and mechanical properties of the plates. With consumption of tall pitch, the amount of losses remains almost unchanged; it is the same with example A, where the consumption of tall pitch is 12%.

Thus, the proposed method, in comparison with the known, allows preserving the loss of the main raw material (wood fiber) and prevents environmental pollution of the fiber.

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Claims (1)

Invention Formula A method for producing dry-formed fibreboard, including steaming wood chips, processing it with a functional additive, grinding it on a fiberboard, drying the fiber, mixing it with a binder, then shaping the wood fiber carpet and hot pressing, characterized in that, in order to reduce the loss of the tarred fiber during the molding of the carpet, a melt is used as a functional additive tall pitch in the amount of 2.5-12% by weight of absolutely dry chips, which are processed chips after steaming. Known ,, 2 Suggested 950 37-57 1Ы8 23-3