CN101229646A

CN101229646A - Wood dyeing method of pretreatment using microwave

Info

Publication number: CN101229646A
Application number: CNA2008100307103A
Authority: CN
Inventors: 李贤军; 傅峰; 周永东; 陈志林; 陈苇; 蒋全兴; 卢克阳; 林兰英
Original assignee: Central South University of Forestry and Technology
Current assignee: Central South University of Forestry and Technology
Priority date: 2008-02-27
Filing date: 2008-02-27
Publication date: 2008-07-30
Anticipated expiration: 2028-02-27
Also published as: CN100575017C

Abstract

The invention discloses a timber dyeing method with microwave pretreatment. The method comprises the following steps: the timber is dried with a conventional drying method to the extent that the moisture content is 20 percent to 40 percent; the microwave is used for heating pretreatment of timber, with the power density of microwave radiation controlled at 0.1-5 w/cm<3>, the radiation temperature at 80-120 DEG C, and the radiation time lasting for 30 to 480 seconds; the timber after heating pretreatment by the microwave is quickly immersed in properly prepared dye liquor in the normal temperature with the immersion time controlled at 30 to 240 minutes; finally, the dyed timber is washed with water and then piled in a drying kiln for post treatment of drying. The method of the invention has the advantages of low investment in equipment, simple technique, good effect of treatment, etc.

Description

Utilize microwave to carry out pretreated wood staining method

Technical field

The present invention relates to a kind of wood staining method, relate in particular to a kind of microwave that utilizes and carry out pretreated wood staining method.

Background technology

Wood staining is to adopt certain technology to be coated in wood surface or infiltration timber inside various pigment, dyestuff, makes timber present versicolor a kind of treatment process.Wood staining is the effective technical way that meets individual requirements, expands the timber scope of application, the excellent usefulness of the bad material of realization, increases the Wood products added value.Aborning, in order to improve the dye level of timber, colouring method commonly used has pressurization, vacuum-pressure processes, cold and hot channel process.Pressurization is that timber and dyeing liquor are placed the pressurized treatments jar, utilizes impressed pressure that dyeing liquor is pressed into timber inside; Vacuum-pressure processes is earlier timber to be placed process tank, vacuumizes the air of getting rid of in the wood cell chamber, by compression pump dyeing liquor is pressed in the process tank then, by high pressure dyeing liquor is pressed into timber inside; Cold and hot channel process is earlier timber to be placed temperature high dyeing liquid, the dyeing liquor that again timber is placed temperature to reduce.Preceding two kinds of processing method equipment investments are big, technology is complicated, processing cost is high, and the processing depth as shallow of the third method.

Summary of the invention

The technical problem to be solved in the present invention is to overcome the deficiencies in the prior art, provides the microwave that utilizes that a kind of equipment investment is little, processing cost is low, treatment effect is good to carry out pretreated wood staining method.

For solving the problems of the technologies described above, the technical scheme that the present invention proposes is that a kind of microwave that utilizes carries out pretreated wood staining method, comprise that timber is predrying, dyeing, dye the back drying steps, it is characterized in that after the predrying step of timber, before the dyeing step, timber is carried out Microwave Pretreatment.

Above-mentioned wood staining method specifically may further comprise the steps:

(1) timber is predrying: utilizing the conventional drying method is 20%～40% with the drying of wood to moisture content;

(2) Microwave Pretreatment: utilize microwave that the timber after predrying is heated, in microwave heating process, microwave irradiation power density is controlled at 0.1～5w/cm ³, temperature is controlled at 80 ℃～120 ℃ during radiation, and radiated time continues 30～480 seconds; Described Microwave Pretreatment technology can adopt timber microwave dryer or other microwave heating equipment that timber is carried out heating using microwave;

(3) dyeing: the timber after the Microwave Pretreatment is immersed in rapidly in the normal temperature dyeing liquid for preparing, and soak time was controlled at 30～240 minutes;

(4) dye the back drying: with the washing of the timber behind the dyeing, the dyeing material after will washing is again put into dry kiln and is carried out dry processing of later stage, the timber after obtaining dyeing.

In above-mentioned wood staining method, by utilizing microwave that timber is carried out preliminary treatment in the past earlier, moisture vaporization, gas in the timber are expanded at dyeing, the air in the wood cell chamber is rejected to outside the timber; And then timber placed the normal temperature dyeing liquid for preparing rapidly, and after the cooling of timber temperature, the water recovery in the lumen, pressure reduces, and utilizes the inside and outside pressure differential of timber dyeing liquor can be pressed into timber inside, reaches the purpose of degree of depth dyeing.

Compared with prior art, the invention has the advantages that can solve effectively that the equipment investment that exists in solid wood pressurization and the vacuum-pressure processes dyeing course is big, processing cost is high and cold and hot channel process dyeing course in the shallow difficult problem of dye level, and provide a kind of microwave that utilizes to carry out pretreated wood staining method.By Microwave Pretreatment of the present invention, can get rid of the air in the wood cell chamber; In processing procedure, the microcosmic of timber inside, macrostructure can not change, and promptly can not produce destruction to timber pit structure, wood cell.Utilize the preliminary treatment before the instantaneity of heating using microwave and high-penetrability dye to timber, not only reduced equipment investment and production cost, and technology is simple, treatment effect is better; In addition, utilize heating using microwave also to have advantages such as firing rate is fast, lumber thickness direction homogeneous heating.

The specific embodiment

Embodiment 1:

Cut-off is the masson pine log of 500mm for 90mm, length directly, and it slowly is dried to moisture content is 30%; Then the log after predrying is placed in the microwave dryer, open microwave generator it is carried out heat pre-treatment, microwave irradiation power is that 3kw (is that radiosity is 0.94w/cm ³), radiation temperature is controlled at 100 ℃, and radiated time is 150 seconds; Again the timber after the heating using microwave is immersed in rapidly in the good normal temperature dyeing liquid of configured in advance, soaked 180 minutes; The washing of timber after will dyeing at last, and the dyeing material after will wash is piled and is carried out dry processing of later stage, the timber after obtaining dyeing in the dry kiln.Compare with the timber that does not pass through Microwave Pretreatment, its dye liquor uptake has improved 31%.

Embodiment 2:

Getting thickness is that 20mm, width are that 100mm, length are the Chinese catalpa wood plank of 100mm, and being dried moisture content in conventional steam drying kiln is 25%; Then the Chinese catalpa wood plank after predrying is placed microwave dryer, open microwave generator heating timber, microwave irradiation power is that 0.8kW (is that radiosity is 4w/cm ³), radiation temperature is controlled at 105 ℃, and radiated time is 100 seconds; Again the timber after the heating using microwave is immersed in rapidly in the good normal temperature dyeing liquid of configured in advance, soaked 120 minutes; The washing of timber after will dyeing at last, and the dyeing material after will wash is piled and is carried out dry processing of later stage, the timber after obtaining dyeing in the dry kiln.Compare with the timber that does not pass through Microwave Pretreatment, its dye liquor uptake has improved 43%.

Claims

1. one kind is utilized microwave to carry out pretreated wood staining method, comprises that timber is predrying, dyeing, dyes the back drying steps, it is characterized in that after timber is predrying, before the dyeing, timber is carried out Microwave Pretreatment.

2. wood staining method according to claim 1 is characterized in that specifically may further comprise the steps:

(2) Microwave Pretreatment: utilize microwave that the timber after predrying is heated, in microwave heating process, microwave irradiation power density is controlled at 0.1～5w/cm ³, temperature is controlled at 80 ℃～120 ℃ during radiation, and radiated time continues 30～480 seconds;