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Method for manufacturing cold plasma modified single board quasi-artificial board

A technology of cold plasma and manufacturing method, which is applied to the jointing of wooden veneers, manufacturing tools, wood processing appliances, etc., which can solve the problems of increasing the release of free formaldehyde from boards and increasing production costs, so as to reduce the amount of adhesive used and operate Convenience and the effect of reducing production costs

Active Publication Date: 2010-05-12
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The increase in the amount of glue is beneficial to improve the bonding strength and deformation resistance of the board, but it also brings about the problems of increasing the production cost and increasing the release of free formaldehyde from the board

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Adjust the moisture content of the poplar veneer to 5%, place it in the sample room of the cold plasma modification equipment, close the sample room, turn on the vacuum pump, pump to a background vacuum of 2 Pa, and then pass in oxygen to carry out modification treatment. Working parameters: vacuum degree 10Pa. The processing power is 100W, and the processing time is 1min. Then, close the oxygen flow valve, feed ammonia gas to carry out graft polymerization treatment. Working parameters: vacuum degree 50Pa, processing power 100W, processing time 3min. Coat the treated veneer surface with urea-formaldehyde resin glue, the amount of glue applied is 260g / m 2 (double-sided), five-layer veneer is used to form a blank and then hot-pressed to make ordinary plywood. Hot-pressing process: hot-pressing temperature: 120°C, hot-pressing pressure: 1.0MPa, hot-pressing time: 60s / mm. After testing, the bonding strength of the board is increased by 6.78% compared with the board mad...

Embodiment 2

[0014] Adjust the moisture content of the poplar veneer to 6%, place it in the sample room of the cold plasma modification equipment, close the sample room, turn on the vacuum pump, pump it to a background vacuum of 2 Pa, and then introduce oxygen to carry out modification treatment. Working parameters: vacuum degree 20Pa. The processing power is 200W, and the processing time is 3min. Then, close the oxygen flow valve, feed ammonia gas to carry out graft polymerization treatment. Working parameters: vacuum degree 60Pa, processing power 200W, processing time 6min. Coat the treated veneer surface with urea-formaldehyde resin glue, the amount of glue applied is 250g / m 2 (double-sided), five-layer veneer is used to form a blank and then hot-pressed to make ordinary plywood. Hot-pressing process: hot-pressing temperature: 120°C, hot-pressing pressure: 1.0MPa, hot-pressing time: 60s / mm. After testing, the bonding strength of the board is increased by 20.6% compared with the boar...

Embodiment 3

[0016] Adjust the moisture content of the poplar veneer to 8%, place it in the sample room of the cold plasma modification equipment, close the sample room, turn on the vacuum pump, pump it to a background vacuum of 4 Pa, and then introduce oxygen to carry out modification treatment. Working parameters: vacuum degree 30Pa. The processing power is 300W, and the processing time is 5min. Then, close the oxygen flow valve, feed ammonia gas to carry out graft polymerization treatment. Working parameters: vacuum degree 80Pa, processing power 300W, processing time 10min. Coat the treated veneer with urea-formaldehyde resin glue, the amount of glue is 240g / m 2 (double-sided), five-layer veneer is used to form a blank and then hot-pressed to make ordinary plywood. Hot-pressing process: hot-pressing temperature: 120°C, hot-pressing pressure: 1.0MPa, hot-pressing time: 60s / mm. After testing, the bonding strength of the board is increased by 18.7% compared with the board made of untre...

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Abstract

The invention relates to a method for manufacturing cold plasma modified single board quasi-artificial board. The technique thereof is implemented by regulating water content of the single board to 5-8%, placing in a sample chamber of cold plasma modification equipments, vacuum pumping to 2-4Pa, pumping in oxygen, and regulating vacuum degree to 10-30Pa; starting a radio frequency power source, regulating processing power to 100-300W, and modifying the surface of the single board for 1-5min; turning off the oxygen flow control valve, pumping in ammonia, keeping vacuum degree at 50-80Pa, starting the radio frequency power source, regulating processing power to 100-300W, performing graft polymerization on the single board for 3-10min; coating urea resin on the surface of the single board, ageing, assembling and hot-pressing to manufacture into boards. The bonding strength of the product made of single boards modified by cold plasma can be improved by 5-25%, and the release amount of free formaldehyde is decreased by 10-30%. In addition, the method causes no pollution, and is simple in operation and strong in controllability.

Description

technical field [0001] The invention relates to a method for manufacturing veneer-based artificial boards (including plywood, multi-layer solid wood composite floor base materials and non-structural laminated veneer materials) through cold plasma modification treatment. It belongs to the technical field of wood-based panel manufacturing. Background technique [0002] Since the 21st century, my country's wood-based panel production is developing rapidly at an average annual growth rate of 20%. According to statistics, by the end of 2008, there were more than 6,000 large and medium-sized wood-based panel enterprises, with a total annual output of 94.1 million cubic meters. It is the world's largest wood-based panel production, consumption and import and export trade. Among the many wood-based panel products, the output and export volume of plywood has always ranked first. According to relevant data, the output of plywood in my country reached 35.41 million cubic meters in 20...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27D1/08B27K1/00
Inventor 周晓燕汤丽娟周定国张小培邵汉良徐信武梅长彤潘明珠郑菲许娟钱滢
Owner NANJING FORESTRY UNIV
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