SU1419894A1 - Particle-board production line - Google Patents

Abstract

This invention relates to the woodworking industry. The purpose of the invention is to improve the quality of the plates by reducing the formaldehyde content. The line includes units for the preparation of wood particles, drying in the form of separate chambers 18, sorting, forming a carpet and pressing. In front of the drying unit, there is a removal device from unbound moisture in the form of a box 10 with a lamellar bottom 11. The box 10 is connected to the upper 12 and lateral parts with a pneumatic system and has a mechanism for alternately supplying air to the plate bottom 11. Wood particles entering the node drying, it is fed to the plate bottom 11 and to the guide channels 17. With the help of the alternate air supply mechanism, hot air is fed under the plate plate I1 of the first chamber. Due to the created air pressure and the inclined channels 17, the particles are directed to the outlet of the drying unit. 7 il. i (P

Description

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The invention relates to the woodworking industry and can be used in the manufacture of wood-based panels.

The purpose of the invention is to improve the quality of the plates by reducing the formaldehyde content.

Figure 1 shows the production line of particle boards; figure 2 is a drying unit; on fig.Z - section aa in figure 2; figure 4 - section bb on: fig.Z; on fig.Z - section bb In figure 4; figure 6 is a view of G in fig.Z; figure 7 - section dd in figure 6.

The lines for the manufacture of wood-fiber boards include kinematically Interconnected node 1 | preparation of wood particles 2, nodes 3 drying, 4 sorting, 5 carpet formations and 6 pressing plates, and also drive 7 with a pneumatic system 8. | Line is equipped with a nepeq located knotting the drying unit with the removal device 9 from the particles 2 unbound moisture, which is made in the form of a box 10 with a bottom bottom m 1 1, while the box 10 is connected to the upper 12 and side 13 parts to the pneumatic system 14 and has: a mechanism 15 alternately feeding air ha to plates 11 in the form of a turn The rotary disk 16 with a transverse channel connects the pneumatic system 14 to the plates 11, and the plates 11 are rotatable with guide channels 17 inclined from the entrance of the box 10 to its exit, the drying unit being made as a series of chambers 18 isolated from each other.

Lini works as follows. Wood particles H 2 are fed to preparation node 1, where chips are obtained from them, and then wood particles 2 are fed to node 3, where unbound moisture is removed from them. Fine particles 2 are removed by pneumatic system 8 for further processing. The remaining wood particles 2 through the metering unit arrive at sorting 4, where the separation of coarse and small particles takes place. Large wood particles go for regrinding. Technological chips come to the hot-drying unit 3, where the separation into two fractions again takes place. The small fraction goes to the outer layers, and the large fraction goes to the middle layer. Woody

Particles 2 entering the drying unit 3 are fed to the initial zone of the drying chamber 18 via the metering device 11 to the plate bottom 11 and to the guide channels 17. Using the pneumatic system 14 and the mechanism 15 of the alternate air supply, hot air is fed under the plate bottom 11 the first chamber 18. Due to the created air pressure and the inclined channels 17, the particles 2 are directed to the exit of the drying unit 3. Next, the wood particles 2 arrive at the extrusion unit 6.

The device allows, during drying, to get rid of residues of the fluid particles that are destroyed, are a source of formaldehyde, which enters the atmosphere and is absorbed by larger particles. I

Thus, a significant part of the water is removed in the first stage without heating the wood particles with flue gases, which leads to energy savings because the water has a high heat capacity, as well as reducing the toxicity of the plates and pollution of the atmosphere due to a decrease in the residence time of wood particles in the high environment. temperature

Claims (1)

Invention Formula The lines for the manufacture of particle boards, including kinematically interconnected components for preparing wood particles, drying, sorting, forming a carpet and pressing the plates and driving with a pneumatic system, are different in that, in order to improve the quality of the plates by reducing the formaldehyde content, the line is equipped with In front of the drying unit, a device for removal of unbound moisture from particles, which is made in the form of a box with a lamellar bottom, wherein the box is connected to the upper and side parts of the pneumatic system and has mechanisms still alternately supplying air to the plates in the form of a rotary disc with a transverse channel with a compound of pneumatic plates and the plates are formed with obliquely disposed pivot from the inlet duct to the outlet of the guide channels. Fig, 1 Aa Fig.Z Bb Ik with I ii, /// I ///. five Type G FIG. 6 ////// Fa 5 Dl 7