Method of manufacturing thick medium high density fiber boards using single face spraying vacuum hot pressing technology

A high-density fiberboard, vacuum hot-pressing technology, applied to flat products, wood processing appliances, household components, etc., can solve problems such as difficulties, prolonging the hot-pressing time, and long hot-pressing cycle of medium and high-density fiberboards, and achieve cross-sectional density distribution deviation Small size, increased internal bonding strength, and reduced free formaldehyde

Inactive Publication Date: 2004-12-22
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the hot pressing of medium and high density fiberboards is done by contacting and conducting heating to the slab through the hot pressing plate. Since the fiber is a poor conductor of heat, and the slab contains a certain amount of air, it greatly affects the heat transfer rate of the slab, thus Make the hot pressing cycle of medium and high density fiberboard longer, and it is more difficult to press thick board
When the thick plate needs to be pressed, the hot pressing time can only be extended, and the result will also reduce the appearance and internal quality of the product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Example 1: Compression thickness 30mm, density 0.75g / cm 3 The medium density fiberboard adopts spray steaming-vacuum hot pressing process, and its technical parameters are: the slab is first compressed to 0.35g / cm 3 , and then spray steam the slab, the steam spray time is about 5s, the water vapor pressure is 0.4Mpa, after 1.0min, vacuum the slab, the suction time is 6s.

Embodiment 2

[0014] Embodiment 2: Pressed thick 30mm, density 0.88g / cm 3 The medium density fiberboard adopts spray steaming-vacuum hot pressing process, and its technical parameters are: the slab is first compressed to 0.40g / cm 3 , and then spray steam the slab, the spray steam time is about 10s, the water vapor pressure is 0.6Mpa, after 2.0min, the slab is vacuumed, and the suction time is 8s.

Embodiment 3

[0015] Embodiment 3: pressing thickness 50mm, density 0.75g / cm 3 The medium density fiberboard adopts spray steaming-vacuum hot pressing process, and its technical parameters are: the slab is first compressed to 0.35g / cm 3 , and then spray steam the slab, the steam spray time is about 12s, the water vapor pressure is 0.6Mpa, after 2.0min, vacuum the slab, the suction time is 12s.

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PUM

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Abstract

A technology for preparing the medium-or high-density thick fibreboard includes hot-pressing the raw fibreboard while spraying steam onto its one surface for 1-10 min, and vacuum sucking for removing condensed water for 5-40S. Its advantage is short hot-pressing time and high productivity.

Description

technical field [0001] The invention belongs to the field of wood-based panel manufacturing technology, and in particular relates to a method for manufacturing medium and high-density fiberboard thick boards by a single-side spray steaming-vacuum hot pressing process. Background technique [0002] At present, the hot pressing of medium and high density fiberboards is done by contacting and conducting heating to the slab through the hot pressing plate. Since the fiber is a poor conductor of heat, and the slab contains a certain amount of air, it greatly affects the heat transfer rate of the slab, thus The hot pressing cycle of the medium and high density fiberboard is longer, and it is more difficult to press the thick plate. When it is necessary to press a thick plate, the hot pressing time can only be extended, and the result will also reduce the appearance and internal quality of the product. Contents of the invention [0003] The purpose of the present invention is to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27N3/18
Inventor 徐咏兰华毓坤周定国卢晓宁金菊婉周晓燕
Owner NANJING FORESTRY UNIV
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