Ultrasonic-assisted wood veneer dyeing method

A wood veneer and ultrasonic technology is applied in the field of wood dyeing, which can solve the problems of poor dye penetration and uneven dyeing of wood veneers, and achieve the effects of improving activation energy, good economic and social benefits, promotion prospects, and simple process operation.

Inactive Publication Date: 2015-02-25
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the technical bottleneck of non-uniform dyeing of wood veneer, poor dye permeability, especially thick veneer impervious dyeing under normal pressure conditions, based on the mechanism of wood penetration dyeing, and the unique cavitation effect, mechanical action and thermal effect of ultrasonic waves, Proposed a dyeing method under normal pressure conditions, especially suitable for thick veneer of wood

Method used

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  • Ultrasonic-assisted wood veneer dyeing method
  • Ultrasonic-assisted wood veneer dyeing method
  • Ultrasonic-assisted wood veneer dyeing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Rotate the fast-growing poplar logs into veneers with a thickness of 1.5mm, cut them into veneers with a format of 850mm*560mm, remove defective parts, dry them until the moisture content is less than 8%, polish the surface with 200-grit sandpaper, and put them into a dyed veneer. shelf.

[0054] Prepare acid red GR (C.I.Acid Red 73) dye solution with a dye mass fraction of 0.15% in the batching tank, add 0.15% anhydrous Na 2 SO 4 As a buffer, add 1% dye accelerator NaCl, turn on the agitator to fully dissolve the dye, and slowly add 10% H 2 SO 4 Solution, adjust the pH value of the dye solution to 4.0.

[0055] Pump the dye into the dye vat, turn on the dye solution single circulation system, after the dye solution circulates smoothly, turn on the electric heater, heat the dye solution to 80°C, turn on the ultrasonic transmitter, adjust the ultrasonic power to 0W, 120W, 240W or 300W, Frequency is 20KHz, processing 2h. After reaching the dyeing time, open the dyein...

Embodiment 2

[0057] Cut birch logs into veneers with a thickness of 1.5mm, cut them into veneers with a width of 850mm*560mm, remove defective parts, dry to a moisture content of <8%, polish the surface with 200-grit sandpaper, and put it into a dyeing rack .

[0058] In the batching tank, the acid red GR (C.I.Acid Red 73) dye solution with a dye mass fraction of 0.09%, 0.12% or 0.15% was prepared respectively, and 0.15% anhydrous Na 2 SO 4 As a buffer, add 1% dye accelerator NaCl, turn on the agitator to fully dissolve the dye, and slowly add 10% H 2 SO 4 Solution, adjust the pH value of the dye solution to 4.0.

[0059] Pump the dye into the dye vat, turn on the double circulation system of the dye liquor, after the dye liquor circulates smoothly, turn on the steam heater, heat the dye liquor to 80°C, turn on the ultrasonic transmitter, adjust the ultrasonic power to 300W, the frequency to 20KHz, and process for 2 hours . When the dyeing time is up, open the cover of the dyeing vat,...

Embodiment 3

[0061] Rotate the sycamore logs into veneers with a thickness of 1.2mm, cut them into veneers with a width of 850mm*560mm, remove defective parts, dry to a moisture content of <8%, polish the surface with 200-grit sandpaper, and put it into a dyeing rack .

[0062] Prepare acid red GR (C.I.Acid Red 73) dye solution with a dye mass fraction of 0.15% in the batching tank, add 0.15% anhydrous Na 2 SO 4 As a buffer, add 1% dye accelerator NaCl, turn on the agitator to fully dissolve the dye, and slowly add 10% H 2 SO 4 Solution, adjust the pH value of the dye solution to 4.0.

[0063] Pump the dye into the dye vat, turn on the dye solution single circulation system, after the dye solution circulates smoothly, turn on the electric heater, heat the dye solution to 80°C, turn on the ultrasonic transmitter, adjust the ultrasonic power to 300W, the frequency to 20KHz, and process for 1h , 2h, 3h, 4h or 5h. When the dyeing time is up, open the cover of the dyeing vat, hang out the ...

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Abstract

The invention discloses an ultrasonic-assisted wood veneer dyeing method. The method includes the steps of wood pretreatment; placing pretreated wood veneers into a dye vat and injecting dye liquor into the dye vat; opening a circulating system to enable the dye liquor to flow circularly in the dye vat, opening a heating system after the dye liquor circulates stably, opening an ultrasonic assisting system after the dye liquor reaches the set temperature, and subjecting the wood veneers to ultrasonic treatment. The ultrasonic-assisted wood veneer dyeing method has the advantages that ultrasonic treatment and wood veneer dyeing are conducted simultaneously, dyeing efficiency is high, and pressure equipment is not required; by means of ultrasonic treatment, new fluid passageways in wood are broken through, new dye molecule sorption sites are provided, dye liquor activation energy is improved, wood permeability can be improved, dye dye-uptake rate can be increased, dyeing time is shortened, dyeing temperature is lowered, dyeing effects are enhanced, and the method is applicable to thick veneers and is energy saving and efficient.

Description

technical field [0001] The invention relates to a method for dyeing wood, in particular to a method for dyeing wood veneers assisted by ultrasonic waves. Background technique [0002] Wood dyeing is an emerging technology to realize the efficient utilization of fast-growing wood in plantations. Through dyeing, the visual quality of fast-growing wood can be improved and the precious wood can be imitated. Dyed wood can not only meet people's demand for medium and high-grade decorative wood, but also increase the added value of fast-growing wood. At present, dyed wood products have been used in furniture manufacturing, interior decoration, flooring and wood-based panel finishes, handicrafts and other fields, and have achieved significant social and economic benefits. Wood dyeing is a process in which the dye molecules in the dye solution continuously wet, diffuse, penetrate, and absorb on the surface and interior of the wood. Therefore, the degree of penetration and adsorptio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27K5/02
CPCB27K5/02
Inventor 高建民刘毅郭洪武胡极航陈绍禹
Owner BEIJING FORESTRY UNIVERSITY
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