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Method of manufacturing medium density fiber board thick plate using spray evaporation-vacuum hot pressing technology

A vacuum hot-pressing and medium-density technology, which is applied to flat products, wood processing appliances, household components, etc., can solve problems such as prolonging hot-pressing time and reducing product quality, and achieves small cross-sectional density distribution deviation and internal bonding strength. The effect of improving and reducing free formaldehyde

Inactive Publication Date: 2004-05-05
NANJING FORESTRY UNIV
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  • Summary
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  • Description
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AI Technical Summary

Problems solved by technology

[0002] At present, the hot pressing of medium-density fiberboards is conducted by contacting and heating 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 MDF longer, and it is more difficult to press thick boards
When the thick plate needs to be pressed, the hot pressing time can only be extended, and the quality of the product will be reduced as a result.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0012] Example 1: Compression thickness 20mm, density 0.70g / cm 3 The medium density fiberboard adopts spray steaming-vacuum hot pressing process, and its technical parameters are: the slab is first compressed to 0.3g / cm 3 , and then spray steam the slab, the steam spray time is about 3s, the steam pressure is 0.3Mpa, after 2min, vacuum the slab, the suction time is 6s.

example 2

[0013] Example 2: Press thickness 30mm, density 0.65g / 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 spray steam time is about 8s, the steam pressure is 0.5Mpa, after 6min, the slab is vacuum-suctioned, and the suction time is 8s.

example 3

[0014] Example 3: Pressing thickness 40mm, density 0.60g / 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 15s, the steam pressure is 0.8Mpa, after 8min, the slab is vacuumed, the suction time is 15s.

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Abstract

A process for preparing the thick medium-density fibreboard by steam spraying-vacuum hot pressing technology includes hot pressing to make its density be 0.2-0.7 g / cu.cm while spraying steam under 0.2-1.0 MPa for 2-20S, and vacuumizing for 5-40 S for removing condensed water.

Description

technical field [0001] The invention belongs to the field of wood-based panel manufacturing technology, in particular to a method for manufacturing medium-density fiberboard slabs by injecting steam and vacuum suction on slabs. Background technique [0002] At present, the hot pressing of medium-density fiberboards is conducted by contacting and heating 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 density fiberboard longer, and it is more difficult to press thick plates. When it is necessary to press a thick plate, the hot pressing time can only be extended, and the quality of the product will be reduced as a result. Contents of the invention [0003] The purpose of the present invention is to avoid the disadvantages of the above-mentioned prior art and provide a method to make the center ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27N3/00B27N3/12
Inventor 徐咏兰华毓坤周定国卢晓宁周晓燕金菊婉王守祥张永干冯长富
Owner NANJING FORESTRY UNIV
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