SU1212800A1 - Device for making wood fibre boards - Google Patents

Description

The invention relates to devices for forming a wood fiber carpet and can be applied in the woodworking and pulp and paper industry.

The purpose of the invention is to increase productivity.

FIG. 1 shows a diagram of a device for forming wood fiber carpet; in fig. 2 shows section A-A in FIG. one.

The device contains a massive pool 1, a settling tank 2, waste water, a sizing box 3, an additional mass pipeline 4 with a pipe 5, a slotted pipe 6 for feeding wood fiber, a molding chamber 7, suction boxes 8, tension shafts 9, grids 10, pressing shafts 11 The pipe 5 of the additional mass pipe 4 has a living section I smaller than the formed carpet 12, while it is located coaxially with the slit-like pipe 6 and inside the molding chamber 7.

The pipe 5 has slots 13, the length and width of which increases to the outlet of the pipe.

The device works as follows.

The fibrous pulp from the bulk basin i is fed to the sizing box 3 and then metered through the slit 6 inlet into the molding zone 7. Here, under the action of the suction effect created by vacuum pumps through the suction pump 8 and the grid 10, dehydration occurs on the perforated surface of the forming part 7 of the device. ,

As the grids 10 move, the layers of the future carpet 12 gradually increasing in thickness are moved. After partially

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Layers of carpet 12 will be formed through the perforated, - primary pipe 5 from the sump 2 recycled water is supplied with waste. Water is supplied to the sump 2 after it is removed during the formation of the carpet (from the molding zone, sub-pressing, etc.).

Together with wastewater, fibers, partially paraffin and binder, water-soluble products of wood hydrolysis enter the settler, where all this suspension settles to the bottom, and then is transported to the forming zone through the nozzle 5. The output of the caught fiber in the settler and other particles occurs through holes in pipe 5, and these holes are located in the area of the molding zone where the layers of the future carpet are partially formed. The increase in the perforation holes in the nozzle 5 to its exit is due to the fact that in the initial waste supply zone the layers of the carpet are not strong enough yet, there is a gradual increase in the additional mass introduced into the future carpet with water. With the passage of wastewater containing wood fibers through the already formed layer, they are retained on it. The same happens when hydrophobic and hardening additives pass through the fiber layer, i.e. With this method of introducing waste into wood pulp, materials are captured that have fallen into a septic tank with waste water to produce plates, and they do not go to the surface of the carpet, but remain inside it. This eliminates the appearance of negative moments during hot pressing.

The economic effect from the use of the invention at a plant with a capacity of 5 million meters of slabs per year will be 35-40 thousand rubles.

vniish

Circulation 502

Order 706/24 Subscription

Branch ShSh Patent, Uzhgorod, Proektna St., 4

Claims (1)

DEVICE FOR FORMING A WOOD-FIBROUS CARPET, including a mass pool, a sump of recycled water, a box for gluing wood-fiber mass with a slit-shaped outlet pipe, and also a chamber formed by perforated nets and suction boxes with molding and pressing zones, characterized in that, in order to increase performance, it is equipped with an additional pipe, which is placed coaxially slit-shaped discharge pipe and connected by a mass pipe to the sump, and the output section is additional The nipple is located in the aeon of molding and is perforated. $ g SU. ,, 1212800