Quick pressing method for bamboo skin plywood and laminated wood

A technology of plywood and laminated timber, which is applied in the direction of manufacturing tools, wood processing appliances, and the joining of wooden veneers, can solve the problems of difficulty in promotion, increased investment in cold presses, etc., to reduce deformation and damage, reduce energy consumption, The effect of increased service life

Inactive Publication Date: 2012-11-14
INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The "two-step method" process needs to adjust and reconfigure the equipment. The energy saving effect is more obvious than the traditional "cold upper-hot press-cold lower" process, and the work efficiency is improved. However, it is necessary to purchase a cold press to increase investment, and the process flow There are high requirements for equipment and equipment, and it is still difficult to promote in factories

Method used

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  • Quick pressing method for bamboo skin plywood and laminated wood
  • Quick pressing method for bamboo skin plywood and laminated wood
  • Quick pressing method for bamboo skin plywood and laminated wood

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Choose bamboo strips and bamboo mats with a width of 2-3cm and a thickness of 1.2-2.0mm, and dry them to a moisture content of 8%. The material was soaked in a phenolic adhesive with a solid content of 25% for 5 minutes, removed, drained, and further dried to a moisture content of 15%. Design sheet density 0.9g / cm 3 , thickness 6mm, weighed after calculation, pave the bamboo mat on the outermost layer, and pave the bamboo curtain in the orthogonal direction according to the principle of symmetry, see image 3 ; Put into a hot press, the thickness is controlled by a thickness gauge. Control according to the following process parameters: the hot pressing temperature is 150°C, the high pressure pressure is 3MPa for 3min; the pressure is released to 2MPa within 30s, and the pressure is kept for 2min; the pressure is released to 1MPa within 30s for 4min, and the pressure is released to 0 within 1min to open the press. , take out the board, and store it after trimming (such...

Embodiment 2

[0039] Choose bamboo strips and bamboo mats with a width of 2-3cm and a thickness of 1.2-2.0mm, and dry them to a moisture content of 8%. The material was soaked in a phenolic adhesive with a solid content of 25% for 5 minutes, removed, drained, and further dried to a moisture content of 15%. Design sheet density 0.9g / cm 3 , the thickness is 12mm, weighed after calculation, the bamboo mat is paved on the outermost layer, and the bamboo curtain is paved in the orthogonal direction according to the principle of symmetry, see image 3 ; Put into a hot press, the thickness is controlled by a thickness gauge. Control according to the following process parameters: hot pressing temperature 150℃, high pressure 4MPa for 8min; pressure relief to 2MPa within 40s and hold for 2min; then pressure relief to 1MPa within 40s and hold for 4min; pressure relief to 0 within 3min to open the press , take out the board, and store it after trimming (such as image 3 ). Measured elastic modulus>...

Embodiment 3

[0041] Select bamboo strips with a width of 2-3cm and a thickness of 1.2-1.8mm, and dry them to a moisture content of 8%. The material was soaked in a phenolic adhesive with a solid content of 27% for 8 minutes, removed, drained, and further dried to a moisture content of 12%. Design sheet density 1.0g / cm 3 , the thickness is 25mm, weighed after calculation, all the bamboo curtains are paved in the forming frame in the same direction, put into the hot press, and the thickness is controlled by the thickness gauge. Control according to the following process parameters: hot pressing temperature 150℃, high pressure 5MPa, hold for 15min, depressurize to 2MPa and hold for 3min, then depressurize 1MPa for 2min, finally depressurize to 0 within 5min, open the press, take out the plate and store it .

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Abstract

The invention discloses a quick pressing method for a bamboo skin plywood and a laminated wood. On the basis of the traditional ''cold feeding-hot pressing-cold discharging'' process production line for producing the bamboo skin plywood and the laminated wood, the bamboo skin plywood and the laminated wood can be quickly pressed under the condition that the hot press of the traditional production line is only subjected to small transformation (which is characterized in that one program pressure reduction component is installed in the traditional press); the sized bamboo skin is paved into the bamboo skin plywood in the orthogonal direction or is paved into the bamboo skin laminated wood in the forward direction; the bamboo skin plywood or the bamboo skin laminated wood is put into the hot press; adhesive in the board can be solidified at high temperature and high pressure so as to form a board product by high-pressure forming; then, under the condition that the hot-pressing temperature in the hot press is not lowered, more than three sections of pressure relief processes are implemented; steam in the board is controlled to be released in order; and a finished product is taken out. Compared with the traditional ''cold feeding-hot pressing-cold discharging'' board pressing mode, the quick pressing method disclosed by the invention is characterized in that more than 60% of energy can be saved when being used for preparing the bamboo skin plywood and the bamboo skin laminated wood, and the production efficiency is improved by more than one time.

Description

technical field [0001] The invention belongs to the preparation technology in the field of wood-based panels, in particular to a method for manufacturing bamboo strip plywood and laminated boards. Background technique [0002] At present, the production and pressing process of bamboo wood-based panels in my country mainly adopts the "cold upper-hot pressing-cold lower" process, which has the disadvantages of long pressing time and low production efficiency. , and wood plywood of the same thickness, the hot pressing cycle is generally 15min to 18min. Moreover, the platen of the hot press has been subjected to alternating cold and heat for a long time, and is prone to deformation and damage. At the same time, cooling water consumes a lot of energy, resulting in high production costs. Therefore, process improvement is urgently needed. [0003] The cooling step of the press is omitted, and the pressing process of "hot up-hot down" can greatly reduce the hot pressing time, improv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27D1/08B27G11/00
Inventor 高黎王正任一萍
Owner INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
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