SU1371924A1 - Device for manufacturing multiple-void wood particle boards - Google Patents

Abstract

The invention relates to devices for making hollow-core chipboard and can be used in woodworking industry. The purpose of the invention is to improve the quality of the plates by increasing their equal density and reducing toxicity. The device comprises a node 2 for metering wood particles 3, a node 4 for forming a carpet 5 with voids, a node 7 for cold pressing

Description

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a carpet, a hot extrusion unit 8 with heating plates 9 having channels 10, and screw hollow hollow-formations I1. The dosing unit 2 is filled in the form of a funnel 17 and driving screws 18. The carpet forming unit S 4 is formed by walls 19. The steam supply unit 25 is equipped with an ammonia feed unit 26. The resinous wood particles 3 are sent by the dosing unit 2 to the carpet forming unit 4, where, under pressure, the screws 18 and

The walls 19 and hollow cores 11 are used to make a hollow profile carpet 5. The profile carpet 5 is compacted in the cold-pressing unit 7 and then freed from screw hollow hollow-forming agents 11 and transferred to the interplate space of the hot-pressing unit 8. First, carpets are heated and then treated with ammonia gas fed through channels 10. 4 sludge.

This invention relates to devices for making hollow-core chipboard and can be used in woodworking industry.

The purpose of the invention is to improve the quality of the plates by increasing their equal density and reducing toxicity.

Figure 1 shows the device, a general view; figure 2 - section aa in figure 1; on fig.Z - section bb in figure 1. On figure 4 - the plate, cross section is ready.

The device comprises a base 1, a unit 2 for dispensing wood particles 3, a unit 4 for forming carpet 5 with voids 6, a unit 7 for cold pressing a carpet, a unit 8 for hot pressing with heating plates 9 equipped with channels 10 for transversely supplying steam and ammonia gas into the carpet, screw hollow cores 11 with transverse apertures 12 plugged with outlet ends 13 and inlet ends 14 connected by a pipe 15 with a vacuum pump 16, the metering unit 2 being designed as a funnel 17 and mounted along empty generators P drive augers 18, node 4 of the formation of the carpet 5 is formed by walls 19, and the walls forming the plane of the plate are made profile.

The protrusions of the 20 walls are arranged symmetrically relative to each other.

in the gaps 21 of the hollow cores 11, the valleys 22 are located in the plane of symmetry of each core generator 11, the heating plates 9 are made with the possibility of horizontal and vertical movement with the help of the power cylinders 23 and 24. The cylinders 24 are supported on the base 1, with this unit 25 steam supply

is equipped with an ammonia supply unit 26, and the transverse holes 12 of the pipe holders 11 are located tangentially to the internal channel 27, while the cold-pressing unit 7 and

hot pressing 8 is covered with nets (or ribbons) 28. At the exit of the press, the device is provided with a crosscut saw 29 for formatting cutting hollow-core slabs 30.

The device works as follows.

Wood particles 3 (wood fiber or struktkka), treated with phenolic or urea resins

using the metering unit 2, equipped with screws 18, is sent to the carpet forming unit 4, where, under pressure from the screws 18, the action of the profile walls 19 and hollow-forming agents 11 produces a hollow-profile carpet 5 formed by the projections 20 and valleys 22 of the profile walls 19. Carpet 5 in the formation unit 4 is produced by squeezing the wood particles 3 with the screws 18, i.e. an extrusion method is used, which ensures the orientation of particles perpendicular to the plane of the carpet 5.

The need to obtain a profile carpet with protrusions and depressions is due to the desire to obtain equal density walls of the plate 30 in all areas along its cross section. In order to increase the strength of hollow-core slabs, the profile carpet is guided to a roll sub-press 7, where under the influence of the shafts the carpet 5 is compacted and the wood particles 3 are oriented in the plane of the carpet 5. and screw-cutting void-formers 11 (the void-forming machine is screwed out of the carpet like a screw, while it is rotated in place and the carpet is moved), directed into the clearance between the heating plates 9 of the hot-pressing station 8, which at this moment are in the upper position and in open state.

After the carpet is moved to the interplate space, the heating plates 9 are closed by means of power cylinders 23 and steam is fed through the channels 10 through the thickness of the carpet 5. With the help of unit 25, the heating plates 9 are moved down by means of power cylinders 24. After heat treatment, the supply of steam from the automatic valves is stopped and, using node 26, ammonia gas is supplied to channels 10, which blocks free groups of phenol and formaldehyde, thus reducing the toxicity of the plates.

In the process of pressing, the vapor-gas mixture using a vacuum pump 16 through the openings 12 through the internal channel 27 and the pipeline 15 is removed from the plate 30. When rotating the emptying formers I1, the transverse openings 12 are not clogged with wood particles due to their inclination tangentially to the internal channel 27.

After treatment with ammonia, the pressing cycle is stopped, the plates 9 are opened and, with the help of the power cylinders 24, are moved upwards to their original position. The extruded hollow core plate 30 is cut with a crosscut saw 29 and the cycle is repeated.

Hollow-core slabs cut into a format are directed to the finishing area, where foam is poured into the voids and sealed by fixing films or plates at the ends, and on top of

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for the purpose of water resistance, they are either painted or pasted over with a film.

Thus, the proposed device allows to obtain wall panels of any size and with a bulk weight of 300-400 kg / m. The device provides continuous production of hollow-core slabs of various lengths with high productivity, since warming the carpet with live steam is provided in a few seconds.

The high physicomechanical characteristics of the obtained hollow-core slabs (the strength of the slabs during bending testing) provide as a result of obtaining the same density over the entire cross section of the slab walls, as well as as a result of orientation (flat pressing instead of extrusion) of wood particles than pressing in the plane of the plate.

Reduction of toxicity is provided by introducing gaseous ammonia into the thickness of the slab during hot pressing and thus blocking free phenolic and formaldehyde groups.

Claims (1)

Invention Formula A device for manufacturing hollow-core chipboard plates, comprising a base, a unit for metering particles in the form of augers installed in a funnel, a carpet forming unit formed by walls adjacent to the funnel, hollow core-holders with transverse holes, cold-pressing and pressing units with heating plates as well as a saw, characterized in that, in order to improve the quality of the plates by increasing their equal density and reducing toxicity, the wall of the forming unit on the side of formation of planes Litas are shaped with protrusions and depressions, with depressions located opposite void formers, and protrusions between them, augers of the dosing unit are installed along the void formers, heating plates are made with the possibility of vertical movement using power cylinders supported on the base, the steam supply unit is equipped with ammonia, and the transverse apertures of the hollow cores are located tangentially to the internal channel. g 6-5 Fig.Z Phi.