Process and device for manufacturing thick fiber board by high frequency-contact combined heating mode

A technology for manufacturing fibers and processes, applied in the field of high-frequency-contact combined heating devices, which can solve the problems of long heating time of thick fiberboards, excessive differences in core and surface densities, and excessively thick surface pre-cured layers, etc., to achieve good processing performance , short heating time and high production efficiency

Active Publication Date: 2012-12-12
浙江新木材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention aims at the technical problems of too long heating time and high energy consumption of thick fiberboard caused by the current single contact heating method; too large difference between core and surface density, reduced mechanical properties; too thick surface pre-cured layer, high production cost, and provides A high-frequency-contact combined heating process for manufacturing thick fiberboards, which can produce high-performance fiberboards with a thickness of 30mm to 150mm through high-frequency-contact combined heating

Method used

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  • Process and device for manufacturing thick fiber board by high frequency-contact combined heating mode

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Experimental program
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Effect test

Embodiment 1

[0030] The fiberboard plank of the present invention is formed by uniformly mixing fibers and adhesives and curing by hot pressing. The process of the invention mainly includes batching, paving, molding, heating and post-treatment processes. Raw materials used in this embodiment: 100 parts of wood fiber, 15 parts of adhesive, 2 parts of curing agent, appropriate amount of waterproofing agent and release agent, the adhesive uses urea-formaldehyde resin, the curing agent is ammonium phosphate, the waterproofing agent adopts liquid paraffin, and the release agent adopts sodium silicate.

[0031] ①Batching, weighing the raw materials required for the manufacture of fiberboard, drying the fibers in the raw materials in advance, and controlling the moisture content of the fibers to about 14% according to the temperature and humidity of the manufacturing environment. In order to make the adhesive meet the requirements of use, it is necessary to prepare the glue, mix the adhesive, cu...

Embodiment 2

[0037] Raw materials used in this embodiment: 100 parts of wood fiber, 10 parts of adhesive, 1 part of curing agent, appropriate amount of waterproofing agent, release agent, adhesive is selected phenolic resin, curing agent is ammonium chloride, waterproofing agent adopts liquid paraffin, and release agent Using sodium silicate.

[0038] ①Batching, weighing the raw materials required for the manufacture of fiberboard, drying the fibers in the raw materials in advance, and controlling the moisture content of the fibers to about 8% according to the temperature and humidity of the manufacturing environment. In order to make the adhesive meet the requirements of use, it is necessary to prepare the glue, mix the adhesive, curing agent and waterproofing agent, and stir with a mixer for 30 minutes to make it evenly mixed. Put the dried fiber and the prepared glue into the glue mixer and mix evenly.

[0039] ② Pavement, pave the glued fibers on the surface of the press plate accordi...

Embodiment 3

[0043] Raw materials used in this embodiment: 100 parts of wood fiber, 20 parts of adhesive, 2 parts of curing agent, appropriate amount of waterproofing agent and release agent, the adhesive uses melamine modified urea-formaldehyde glue, the curing agent is boric acid and citric acid, and the waterproofing agent adopts liquid paraffin , The release agent uses sodium silicate.

[0044] ①Batching, weighing the raw materials required for the manufacture of fiberboard, drying the fibers in the raw materials in advance, and controlling the moisture content of the fibers to about 12% according to the temperature and humidity of the manufacturing environment. In order to make the adhesive meet the requirements of use, it is necessary to prepare the glue, mix the adhesive, curing agent and waterproofing agent, and stir with a mixer for 30 minutes to make it evenly mixed. Put the dried fiber and the prepared glue into the glue mixer and mix evenly.

[0045] ② Pavement, pave the glued...

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Abstract

The invention belongs to the technical field of fiber board processing, in particular to a process for manufacturing a thick fiber board by a high frequency-contact combined heating mode. The process comprises the following procedures of batching, paving, mould pressing, heating and post-processing. In the heating procedure, a board blank is heated by coupling a contact heating mode with a high-frequency electric field heating mode, namely the board blank is heated by a hot press board in a contact manner while receiving heat energy generated by a high-frequency electric field, wherein, the temperature of the hot press board is controlled within the range of 80-110 DEG C, and the heating time is controlled within the range of 2min-25min so that an adhesive can reache curing temperature. The invention further relates to a high frequency-contact combined heating device which is applicable to the process. In the invention, the board blank is heated by the high frequency-contact combined heating mode, which overcomes the defects of a single contact heat transfer mode such as non-uniformity in heat conduction and undercure of the adhesive at a core layer caused thereby, and finally solves the heating difficulty in manufacturing the high-performance wood board with the thickness of 30mm-150mm.

Description

technical field [0001] The invention belongs to the technical field of fiberboard processing, and specifically relates to a high-frequency-contact combined heating process for manufacturing thick fiberboard plates, and also relates to a high-frequency-contact combined heating device suitable for the process. Background technique [0002] The excellent performance of wood determines that it becomes an indispensable material in people's production and life. But today, as timber resources are dwindling, humans are beginning to pay more and more attention to how to use twigs or wood scraps as raw materials to manufacture various wood material boards, especially fiberboards. [0003] At present, my country has become a big country in the production and consumption of wood-based panels. The overall production process of wood-based panels is becoming more and more mature and improved, but the single thickness of products is a prominent problem. For example, fiberboard, domestic MD...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): B27N3/12B27N3/18
Inventor张安将陈正光邵成峰
Owner浙江新木材料科技有限公司