JPH0429521B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] This invention relates to a method for manufacturing dyed veneer used for manufacturing artificial decorative veneers used as decorative materials for interior building materials, and an artificial decorative veneer using this dyed veneer. Concerning the manufacturing method.

[Background technology]

Artificial decorative veneer is used as a veneer for decorative boards. This artificial decorative veneer is usually made as follows. That is, a veneer obtained by rotary slicing or the like is degreased, bleached, and then dyed, the obtained dyed veneers are laminated with an adhesive, pressure molded to obtain a composite frit, and this is sliced. It is obtained by The dyed veneers used in such processes were usually almost uniformly dyed. For this reason, the decorative veneer obtained by laminating and pressing such dyed veneers and slicing them has a problem in that the decorative veneer has no color unevenness and tends to have a monotonous color expression.

[Purpose of the invention]

This invention was made in view of the above circumstances, and it is possible to dye a veneer with uneven coloring, and when it is made into an artificially decorated veneer, the uneven coloring is formed in the surface direction and/or thickness direction of the veneer. The purpose is to express a wide variety of color tones.

[Disclosure of the invention]

The inventor made extensive studies to achieve the above object. As a result, this invention was completed.
This invention is characterized in that when dyeing a wood veneer, a wood veneer partially impregnated with water or an alkaline solution using water and a polar solvent is used as the wood veneer to be dyed. The first method of manufacturing veneer
In order to obtain artificial decorative veneers by laminating and laminating dyed veneers and slicing the resulting laminated fritsch, the dyed veneers are partially coated with water or an alkaline solution using water and a polar solvent. The second gist is a method for manufacturing artificially decorated veneers, which is characterized by using dyed impregnated wood veneers. This will be explained in detail below.

The first invention uses wood veneers obtained by rotary lace or the like, or laminated sliced wood veneers obtained by slicing frits obtained by laminating these veneers, as raw materials, and uses these wood veneers as raw materials. After the board has been degreased and bleached according to the usual process, it is characterized by being impregnated with water or an alkaline solution using water and a polar solvent, prior to the next dyeing process.

As the polar solvent in this invention, dimethyl sulfoxide, dimethyl formamide, tetrahydrofuran, etc. are preferably used. Moreover, as the alkali, sodium hydroxide, potassium hydroxide, ammonia, etc. are preferably used.

FIG. 1 is a side sectional view showing an example of a wooden veneer impregnated with an alkaline solution used in the first invention. As shown in the figure, this wooden veneer 1a has an alkaline solution impregnated portion 2 and an alkaline solution non-impregnated portion 3 formed on its surface side. For example, as shown in FIG. 2, this partial impregnation with an alkaline solution can be carried out by using two roll coaters 5a and 5b that face portions 4a and 4b from both ends of the wooden veneer 1a, which is the raw material, to the vicinity of each end. The alkaline solution 6 is applied to the veneer 1 using the alkaline solution 6. In this case, a thickener can be mixed into the alkaline solution if necessary. As the thickener, glycerin, polyethylene glycol, etc. are preferably used.

Next, a wooden veneer impregnated with an alkaline solution is coated with water and dimethyl sulfoxide as a solvent.
A dyeing liquid containing carboxymethylcellulose and acidic dye dissolved therein is applied to the entire surface of both sides using an ordinary roll coater. FIG. 3 is a side cross-sectional view showing a wooden veneer to which a dyeing solution has been printed and applied after impregnation with an alkaline solution. As shown in the figure,
This wooden veneer 1a has a staining solution 7 applied to both surfaces thereof.

When this wood veneer 1a is heated and dried, a dyed veneer 8 as shown in FIG. 4 is obtained. In the printed dyed veneer 8 shown in FIG. 4, the alkaline solution impregnated area 2 of the wood veneer 1a shown in FIG. . The alkaline solution-impregnated area is light colored because the alkali suppresses dyeing. Therefore, by appropriately adjusting the permeation of the alkaline solution into the wood veneer, color unevenness such as shading can be freely formed. Note that the penetration of the alkaline solution can be controlled by the polarity and viscosity of the alkaline solution. That is, when an alkaline solution containing a polar solvent is used, its permeability is promoted, and the alkaline solution quickly permeates in the thickness direction of the veneer. On the other hand, if the viscosity of the alkaline solution is increased by adding a thickener or the like, the permeability into the inside becomes poor. In addition,
When applying the alkaline solution, it is also possible to create variations such that a color pattern is expressed on a two-dimensional surface.

In the second invention, the dyed veneers obtained in the first invention are laminated and laminated as usual, and the resulting laminated frits are sliced to obtain artificial decorative veneers.

That is, the second invention is a method in which a plurality of dyed veneers obtained in the first invention, or dyed veneers and other veneers, prepreg, etc. are laminated with an adhesive as needed, and this is molded. Pressure molding is performed using an appropriate mold such as a mold with a flat surface or a mold with unevenness to obtain a composite frit without unevenness or a composite frit with unevenness such as curvature. This assembled fritsch is sliced at a desired angle to reveal the grain or straight grain to obtain artificial decorative veneers.

The artificially decorated veneer obtained in the second invention can express color unevenness that is rich in variation in the surface direction and/or thickness direction of the veneer due to the color unevenness of the dyed veneer.

〔Effect of the invention〕

The first manufacturing method according to the present invention uses a wood veneer impregnated with water or an alkaline solution using water and a polar solvent as the wood veneer to be dyed. The dyed veneer obtained can freely express color unevenness such as shading and color patterns depending on whether or not it is impregnated with an alkaline solution.

Furthermore, in the second manufacturing method according to the present invention, the dyed veneers obtained in the first invention are laminated and laminated, and the obtained laminated frits are sliced to make an artificial decorative veneer. The veneer can express color unevenness that is rich in variation in the surface direction and/or thickness direction of the veneer due to the color unevenness that the dyed veneer has.

〔reference〕

When a large amount of salts are dissolved in a dyeing solution, the dye precipitates due to salting out, but if the object to be dyed is present therein, the dye is quickly stained. By utilizing this effect and fixing the dye to the wood veneer in the following manner, migration during drying of the veneer and bleeding during painting can be suppressed.

That is, after impregnating a wooden veneer obtained by rotary lace with an acidic or basic solution,
Apply dyeing solution of acid dye or direct dye to the print and cure. After that, it is impregnated with a basic or acidic solution and then heated and dried. An aqueous solution such as HCL is used as the acidic solution, and an aqueous solution such as NaOH is used as the basic solution.
Further, a solvent such as water, dimethyl sulfoxide, or glycols is used as the printing liquid, and a thickener such as glycerin is added as necessary.

When this type of treatment is carried out, the acid applied earlier reacts with the base applied later to form a salt, or conversely, the base applied earlier reacts with the acid applied later to form a salt, resulting in the wood veneer being damaged. The dye is fixed by salting out inside the container.

In addition, in such a method, when an acid dye is used, the following effects can also be obtained compared to the case where a salt aqueous solution is applied after applying a dyeing solution. In other words, when an alkali is pre-coated, staining of the dye is suppressed and the dye solution can penetrate uniformly.
Furthermore, when acid is pre-coated, the dyeing is accelerated, the amount of dyeing on the surface to which the dyeing solution is applied is increased, and a color concentration gradient can be formed in the thickness direction of the wood veneer.

In addition, when using a solvent in the staining solution,
Solvent remains in the wood veneer. Since residual solvent tends to cause poor adhesion, it is necessary to dissolve it. In such a case, you can do the following:

That is, dyes are hardly soluble in solvents with low polarity, but they are slightly soluble in glycols used in textile printing, and this effect is utilized. Specifically, a wood veneer obtained by rotary lace or the like is dyed using a dipping method or a printing method, and then immersed in a solvent with low polarity. Examples of less polar solvents include toluene, benzene, naphthalene, anthracene,
Phenol, benzyl chloride, etc. are used. Further, as the textile dyeing solution, an acidic dye solution or a direct dye solution is used, which is prepared by adding a thickener such as carboxymethyl cellulose or sodium alginate to a solvent such as water, dimethyl sulfoxide, or glycols. These textile dyeing solutions are applied using a flow coater, roll coater, spray method, etc., and then heated and dried.

As a result, solvents such as glycols elute into less polar solvents, but dyes do not.
This promotes adhesion within the wood veneer. Further, since a solvent with low polarity generally has a low boiling point, drying after treatment can be performed at a low temperature. Therefore, it is economical and also prevents deterioration of the dye due to heat.

The dyed veneer thus obtained is laminated and pressed,
By slicing, it can be made into artificial decorative veneer.

[Brief explanation of drawings]

Fig. 1 is a side sectional view showing an example of a wood veneer impregnated with an alkaline solution used in the present invention, Fig. 2 is a perspective view showing an example of an apparatus for impregnating and applying an alkaline solution in this invention, and Fig. 3 is a side sectional view showing an example of a wood veneer impregnated with an alkaline solution. FIG. 4 is a side cross-sectional view showing an example of a wooden veneer to which a dyeing liquid was later applied. FIG. 4 is a side cross-sectional view showing an example of a dyed veneer obtained by the present invention. 1, 1a, 1b...Wood veneer, 2...Alkaline solution impregnated part, 3...Alkaline solution non-impregnated part, 5
a, 5b...Roll coater, 6...Alkaline solution, 7...Dyeing solution, 8...Dyed veneer, 9...Light color area, 10...Dark color area.

Claims (1)

[Claims] 1. In dyeing a wood veneer, a wood veneer partially impregnated with water or an alkaline solution using water and a polar solvent is used as the wood veneer to be dyed. A manufacturing method for dyed veneer. 2. The method for producing a dyed veneer according to claim 1, wherein the dyeing is performed by a textile printing method. 3. The method for producing a dyed veneer according to claim 1 or 2, wherein the alkaline solution contains a thickener. 4 When laminating dyed veneers and slicing the resulting laminated fritsch to obtain artificially decorated veneers, wood partially impregnated with water or an alkaline solution using water and a polar solvent is used as the dyed veneer. A method for producing artificially decorated veneers, which is characterized by using dyed veneers. 5. The method for producing an artificially decorated veneer according to claim 4, wherein the dyeing is performed by a textile printing method. 6. The method for producing an artificially decorated veneer according to claim 4 or 5, wherein the alkaline solution contains a thickener.