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Preparation method of high-strength bamboo veneer

A high-strength, veneer technology, used in manufacturing tools, mechanical equipment, reed/straw treatment, etc., to reduce the difficulty of flattening, overcome mildew, and have high physical strength

Active Publication Date: 2020-09-15
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the above-mentioned problems that existing bamboo material flattening equipment and method exist, propose a kind of preparation method of fast high-strength bamboo veneer, by adopting sodium chlorite and hydrogen peroxide mixed solution to bamboo tube It is processed to remove part of the hemicellulose and lignin in the bamboo tube, open the tight connection between the cellulose and rely on hydrogen bonds to make the bamboo tube replastic, and then use a simple process to unfold the bamboo tube, and finally maintain a certain Under the condition of moisture content, through high temperature and high pressure, relying on a large number of cellulose hydroxyl groups in bamboo to form strong hydrogen bonding again, forming a highly dense whole bamboo veneer

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0014] A preparation method of high-strength bamboo veneer, specifically comprising the steps of:

[0015] (1) Cut bamboo into bamboo tubes with a length of 1-1.5m, and then put them in a high-temperature water pool at 80-100°C for 8-12 hours; take out the steamed bamboo tubes and dry them at low temperature, and then dry the bamboo tubes at 100°C until The moisture content is about 6-10%. Finally, put it into a climate box with a temperature of 25°C and a relative humidity of 65% for equilibrium treatment.

[0016] (2) Mix sodium chlorite solution with a mass fraction of 10-20% and hydrogen peroxide solution, and the mass ratio of hydrogen peroxide solution added is 15-25% of the solid mass of sodium chlorite;

[0017] Then seal the inner and outer walls of the bamboo tube prepared in step (1) with tin foil, cover the upper and lower ends of the bamboo tube with acid-resistant, alkali-resistant and high-temperature-resistant sealed bags, and fill the prepared sodium chlorite ...

Embodiment 1

[0022] (1) Cut the moso bamboo tube into several sections of 1m long bamboo tube, and then put it into a high-temperature water pool at 80°C for 8 hours; take out the steamed bamboo tube and dry it at low temperature, and then dry the bamboo tube at 100°C until the moisture content is 8% or so; finally placed in a climate box with a temperature of 25°C and a relative humidity of 65% for equilibrium treatment;

[0023] (2) Mix the sodium chlorite solution with a mass fraction of 20% and the hydrogen peroxide solution, and the mass ratio of the hydrogen peroxide solution is 25% of the solid mass of sodium chlorite; then step (1) is ready The inner and outer walls of the bamboo tube are sealed with tin foil, and the upper and lower ends of the bamboo tube are tightly sealed with acid-resistant, alkali-resistant and high-temperature-resistant sealed bags. The prepared sodium chlorite solution is filled in the sealed bag at the upper end, and the solution is quickly sucked into the ...

Embodiment 2

[0028] (1) Cut the Julong bamboo produced in Yunnan into 1.5m-long bamboo tubes, and then put them in a high-temperature water pool at 100°C for 12 hours; take out the cooked bamboo tubes and dry them at low temperature, and then dry the bamboo tubes at 100°C until the moisture content is 8% or so; finally put into a climate chamber with a temperature of 25°C and a relative humidity of 65% for equilibrium treatment;

[0029] (2) Mix the sodium chlorite solution with a mass fraction of 15% and the hydrogen peroxide solution, and the mass ratio of the hydrogen peroxide solution is 20% of the solid mass of sodium chlorite; then step (1) is ready The inner and outer walls of the bamboo tube are sealed with tin foil, and the upper and lower ends of the bamboo tube are tightly sealed with acid-resistant, alkali-resistant and high-temperature-resistant sealed bags. The prepared sodium chlorite solution is filled in the sealed bag at the upper end, and the solution is quickly sucked in...

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Abstract

The invention provides a preparation method of a high-strength bamboo veneer. A mixed solution of sodium chlorite and hydrogen peroxide is used for pretreating a bamboo tube to remove part of hemicellulose and lignin in the bamboo tube and open a hydrogen bond connection between celluloses in order to make the bamboo tube have replasticity, the bamboo tube is unfolded by utilizing a simple process, and finally a large number of cellulose hydroxyl groups in the bamboo material are combined in a hydrogen bond form by utilizing high temperature and high pressure under the condition of keeping a certain moisture content to form the whole bamboo veneer with high compactness. The method has the advantages of being simple in process, low in cost, short in time and the like, a special bamboo flattening machine is not needed, preparation of the high-strength bamboo veneer can be achieved through simple equipment, and the method is suitable for large-area application and popularization.

Description

technical field [0001] The invention relates to a method for preparing a high-strength bamboo veneer, which belongs to the technical field of bamboo / wood processing. Background technique [0002] As a large classification of wood, bamboo has a wide range of sources, fast growth rate, beautiful texture, and low price. It has been widely used in daily necessities and building structures, but the natural hollow and knotty shape of the original bamboo tube limits its application in the field. further wide application. In order to improve the utilization rate of bamboo, the round bamboo flattening technology has been extensively studied since the 1980s. The main research idea is to treat bamboo chips or bamboo tubes at high temperature to reach the softening temperature of lignin, and then flatten them in a special round bamboo Flattening is carried out on the machine to overcome the limitation of bamboo tube shape, which is convenient for advanced processing and multi-face appl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27K9/00B27J1/00B27K5/00B27K5/04B27K3/32B27K3/20B27K3/16B27M1/02
CPCB27J1/00B27K3/16B27K3/20B27K3/32B27K5/0085B27K5/04B27K9/002B27M1/02
Inventor 何文李泽芦梦婷曹济舟强瀚程大莉许斌
Owner NANJING FORESTRY UNIV
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