Wooden sheet dyeing method for performing pretreatment by using cold plasma

A technology of cold plasma and dyeing method, which is applied in the field of wood composite material manufacturing, can solve the problems of slow lateral diffusion of dye solution, hinder the development of wood dyeing, and poor lightfastness of dyeing, and achieve the reduction of dyeing energy consumption, fast dyeing speed, and attached strong effect

Inactive Publication Date: 2012-02-15
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the small channel diameter of the microcapillary system, the lateral diffusion speed of the dye solution in the wood is very slow. Therefore, when the material to be dyed has a large format and thickness, the dyeing speed is very slow and the dyeing uniformity is poor.
In addition, for direct dyeing of wood, the mutual binding force between the dye and wood is mainly intermolecular van der Waals force or hydrogen bond, which is physical adsorption, and the light resistance of dyeing is poor.
The above problems have hindered the development of wood staining

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Take a poplar veneer with a thickness of 0.5mm, a length of 100mm, and a width of 100mm, adjust the moisture content to 12% after drying, place it on the feed conveyor belt of the cold plasma treatment system, adjust the distance between the two electrode rollers, Keep the distance between the surface of the wooden veneer and the electrode at 0.5 mm. Turn on the power supply, adjust the processing power to 1kW, and make the working gas between the electrodes generate cold plasma through dielectric barrier discharge. The wood veneer passes through four pairs of discharge electrode rollers at a speed of 2m / min. The working gas between the first two pairs of electrodes is air, and the working gas between the last two pairs of electrodes is ammonia. The wooden veneer treated with cold plasma is dyed by immersing it in the prepared direct dyeing solution, the temperature of the dyeing solution is 90° C., and the dyed wooden veneer is obtained after washing and drying. Compa...

Embodiment 2

[0016] Take a poplar veneer with a thickness of 3.0mm, a length of 100mm, and a width of 100mm, adjust the moisture content to 8% after drying, place it on the feeding conveyor belt of the cold plasma treatment system, adjust the distance between the two electrode rollers, Keep the distance between the surface of the wooden veneer and the electrode at 1 mm. Turn on the power supply, adjust the processing power to 3.5kW, and make the working gas between the electrodes generate cold plasma through dielectric barrier discharge. The wood veneer passes through four pairs of discharge electrode rollers at a speed of 10m / min. The working gas between the first two pairs of electrodes is air, and the working gas between the last two pairs of electrodes is ammonia. The wooden veneer treated with cold plasma is dyed by immersing it in the prepared direct dyeing solution, the temperature of the dyeing solution is 90° C., and the dyed wooden veneer is obtained after washing and drying. Co...

Embodiment 3

[0018] Take a poplar veneer with a thickness of 5.0mm, a length of 100mm, and a width of 100mm, adjust the moisture content to 2% after drying, place it on the feeding conveyor belt of the cold plasma treatment system, adjust the distance between the two electrode rollers, Keep the distance between the surface of the wood veneer and the electrodes at 1.5 mm. Turn on the power supply, adjust the processing power to 6kW, and make the working gas between the electrodes generate cold plasma through dielectric barrier discharge. The wood veneer passes through four pairs of discharge electrode rollers at a speed of 20m / min. The working gas between the first two pairs of electrodes is air, and the working gas between the last two pairs of electrodes is ammonia. The wood veneer treated with cold plasma is dyed by immersing it in the prepared direct dye solution, the temperature of the dye solution is 80°C, and the dyed wood veneer is obtained after washing and drying. Compared with t...

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PUM

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Abstract

The invention discloses a wooden sheet dyeing method for performing pretreatment by using cold plasma. The process comprises the following steps of: adjusting the water content of a wooden sheet to be 2-12 percent; placing on a feed conveying belt of a cold plasma treatment system; adjusting a space between two electrode rollers to keep the gap between the surface of the wooden sheet and an electrode at 0.5-1.5mm; starting a power supply; adjusting treatment power to be 1-6kW to produce cold plasma through dielectric barrier discharge of working gas between two electrodes; passing the wooden sheet through four pairs of discharge electrode rollers at a speed of 2-20m/min to simultaneously treat two surfaces of the wooden sheet, wherein the working gas between the two pairs of front electrode rollers is air and the working gas between the two pairs of rear electrode rollers is ammonia gas; and immersing the pretreated wooden sheet in direct dye solution for dyeing, and then washing and drying to obtain a dyed wooden sheet. The wooden sheet pretreated by cold plasma has high dyeing speed, high dye uptake and superior light resistance. In addition, the method has the advantages of energy conservation, environmental friendliness, easiness and convenience in operation, high efficiency and capability of continuous working.

Description

technical field [0001] The invention relates to a wood veneer dyeing method using cold plasma for pretreatment, and belongs to the technical field of wood composite material manufacturing. Background technique [0002] With the reduction of natural precious timber resources, industrial timber has gradually turned to artificial forest timber. The artificial forest grows faster, so the material is looser and the color is uneven; in addition, some artificial forest wood is prone to discoloration during storage and processing, making it widely used in construction, decoration, furniture, wood-based panel processing, etc. restricted. The artificial forest wood is dyed and processed to simulate the texture and color of precious species of wood. It is used in construction, interior decoration and furniture manufacturing, which can significantly improve the decoration and added value of artificial forest wood. [0003] The traditional method of dyeing wood veneer is the thermal di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27K5/02
Inventor 周晓燕章蓉汤丽娟周定国潘明珠梅长彤陈敏智兰平杨雪慧
Owner NANJING FORESTRY UNIV
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