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Heat pressing process for promoting artificial plate property

A technology of production efficiency and hot-pressing process, which is applied in the field of wood composite material manufacturing, can solve problems such as unfavorable production efficiency, prolonging the hot-pressing cycle, and adverse effects on board performance, so as to change the density distribution of the end surface, improve the performance of the core layer, and reduce negative effects. effect of influence

Inactive Publication Date: 2007-11-07
SOUTHWEST FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] During the above hot pressing process, after the slab is heated, the moisture on the surface of the slab vaporizes, and the water vapor carries the heat and transfers to the core layer, the temperature of the core layer rises, the adhesive solidifies, and the moisture in the core layer also begins to vaporize and accumulate inside the slab, resulting in Large steam pressure, the existence of steam pressure will have a negative impact on the performance of the plate. At the same time, after the hot pressing is completed, in order to prevent the damage of the steam pressure to the slab, the pressure relief process can only be carried out gradually, which prolongs the hot pressing cycle. It is beneficial to improve production efficiency, so how to eliminate the negative impact of steam pressure inside the slab has important practical significance for the formulation of wood-based panel hot pressing process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Embodiment 1: 6-8mm medium density fiberboard multi-layer press hot pressing process (sheet temperature 180 ~ 200 ℃) After the slab is loaded, the press is closed within 2 to 90 seconds until the slab is in contact with the pressing plate. When the press is closed to a position greater than the target thickness of 1-10mm, the pressure reaches 10-25MPa. After keeping it for 1-30 seconds, reduce the pressure to 0-12MPa. After keeping it for 30 seconds, turn on the press and reduce the pressure to 0-12MPa. within the range of 5MPa to release the steam inside the slab, which eventually leads to a drop in the steam pressure inside the slab. After 5-30 seconds, the press restores the pressure to 0-20MPa and maintains it for 30 seconds. The machine is closed to a position greater than the target thickness of 1 ~ 6mm, and after 45 seconds, the pressure is released and the press is opened to take out the plate.

[0013] Under the same conditions, the internal bonding strength of...

Embodiment 2

[0014] Embodiment 2: 16-18mm medium density fiberboard multilayer press hot pressing process (sheet temperature 180~200 ℃)

[0015] After the slab is loaded, the press starts to close. After the slab is loaded, the press closes within 2 to 90 seconds until the slab is in contact with the platen. When the press is closed to a position greater than the target thickness by 1 to 10mm, the When it reaches 10-25MPa, keep it for 1-30 seconds, then reduce the pressure to 0-12MPa, and keep it for 60 seconds, then turn on the press and lower the pressure to 0-5MPa to release the steam inside the slab, and finally cause the inside of the slab to The steam pressure drops, after 5-30 seconds, the press restores the pressure to 0-20MPa and maintains it for 50 seconds, and then closes the press to a position greater than the target thickness of 1-6mm within 2-60 seconds, and maintains it for 100 seconds After one hour, the pressure is released and the press is turned on to take out the sheet...

Embodiment 3

[0017] Example 3: 16mm particleboard single-layer press thermal process (press plate temperature 205°C)

[0018] After the slab is loaded, the press is closed within 2 to 90 seconds until the slab is in contact with the platen. When the press is closed to a position greater than the target thickness of 1 to 10 mm, the pressure reaches 10 to 25 MPa and is maintained for 1 to 30 seconds. Finally, reduce the pressure to the range of 0-12MPa and keep it for 60 seconds, then turn on the press and lower the pressure to the range of 0-5MPa to release the steam inside the slab, which will eventually cause the steam pressure inside the slab to drop. After 5-30 seconds , the press restores the pressure to 0-20MPa and maintains it for 60 seconds, then closes the press to a position greater than the target thickness of 1-6mm within 2-60 seconds, and after maintaining it for 30 seconds, release the pressure and open the press to take it out sheet.

[0019] Under the same conditions, compa...

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PUM

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Abstract

The invention discloses an improvement hot-pressing craft of artificial plate property in the composite wood material making technique domain, which is characterized by the following: loading the plate mould; closing for 2-90 s through press until the plate mould touches the plate; keeping 1-30 s to reduce the pressure within the scale of 0-12 Mpa when the press closure is more than object thickness by 1-10 mm and the plate pressure reaches 10-25 Mpa; keeping for 30-250 s; opening the press to reduce the pressure at 0-5 Mpa; releasing the steam in the plate; reducing the steam pressure for 5-30 s; restoring the pressure at 0-20 Mpa for 30-300 s; making the press close than object thickness by 1-6 mm within 2-60 s; keeping 45-450 s; starting the press to fetch the plate.

Description

Technical field: [0001] The invention relates to a hot-pressing process capable of improving the properties of wood-based panels, and belongs to the technical field of wood composite material manufacturing. Background technique: [0002] Hot pressing is an important process in the production of wood-based panels. Reasonable formulation and optimization of the hot pressing process will help improve the efficiency of the production line and improve product quality. The basic principle of hot pressing is: through the closing of the pressing plate, the wood-based panel slab with the adhesive applied is compressed to a specified thickness, and through the contact heating of the pressing plate, a series of physical and chemical changes occur between the wooden structural unit and the adhesive in the slab. Complete curing to form wood-based panels with specified physical and mechanical properties. [0003] The traditional hot pressing process is usually: after the slab is loaded, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B27N3/10
Inventor 杜官本
Owner SOUTHWEST FORESTRY UNIVERSITY