JPS5845931B2 - Manufacturing method of artificial decorative veneer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing artificially decorated veneers.

By laminating and press-bonding multiple wood veneers to form a flitch, and slicing this flitch, an artificial decorative unit is created in which the laminated contact surface of each wood veneer is expressed as annual ring lines on the wood surface. In the manufacturing method of the board, in order to make the color tone of the conventionally obtained artificially decorated veneer resemble that of natural wood, a light-colored tree species with a high dyeing effect is used as the wood material veneer, and the color tone is dyed in an attempt to reproduce this. Previously, the wood veneer used was dyed in a bath, but the wood veneer used was limited to light-colored wood species, which not only limited the types of wood that could be used, but also made it impossible to dye the wood veneer to a lighter color than the wood veneer used. Therefore, it is not possible to achieve a color tone of the artificially decorated veneer that is lighter than that of the wood material veneer used, and due to differences in fiber structure in the heartwood and sapwood of natural wood, etc. It was also impossible to suppress the resulting unevenness in the dyeing and make it uniform.

In order to overcome the drawbacks of the conventional methods mentioned above, a method has been developed in which decolorization is performed before dyeing wood veneers, but since differences in the degree of decolorization greatly affect the dyeing effect, If there is a difference in the degree of decolorization between lots, if flitching is performed for each lot, the resulting artificially decorated veneer will have a different color. It is extremely difficult to carry out a bleaching process to prevent this from occurring due to variations in the quality of the wood veneers used and the difficulty in adjusting the bleaching bath, which inevitably results in uneven color tones.

On the other hand, if there is little variation in the degree of decolorization, if the decolorized wood veneers are dyed under the same dyeing conditions, the color tones of each wood veneer will be too uniform, resulting in an artificially decorated veneer. The color tone of the wood grain pattern expressed on the wood surface becomes monotonous, and it is not possible to reproduce the subtle color changes seen in natural wood. It has the disadvantage of being lacking.

Therefore, an object of the present invention is to provide a method for producing artificial decorative veneers having natural-looking color tones without causing color differences in the artificial decorative veneers produced between lots.

An embodiment of the present invention will be described below based on the drawings.

That is, the method for manufacturing this artificially decorated veneer includes a decoloring process (Figure A) in which a wood veneer 1 is immersed in a decolorizing bath 2 such as an aqueous hydrogen peroxide solution (Fig. L value of plate 1 (UL according to JIS Z8730
The brightness in the C8 display system, a, and b systems (Hunter color difference method) is measured using a spectrophotometer, and the brightness value (the larger the number, the brighter) is used as a measure of the degree of decolorization, for example, L.
Value 90 or more...A 85-90... Mouth 80-85...Multiple stages of group A (close to white), - (reddish) depending on the degree of decolorization as shown in C. , a yellowish tinge remains and the finish of the dyeing process in the subsequent process becomes a dark color).

The decolorized veneer sorting process (B in the same figure) separates the wood materials into groups A220 and C220 in the decolorized veneer sorting process (with a degree of decolorization between A and C). A dyeing process (C) in which each group of boards is dyed under the same dyeing conditions (regardless of the sorted group), and these dyed wood veneers 1 are subjected to the decolorization process. In the board sorting process, veneers belonging to each group are mixed with those belonging to other groups, so that they are properly combined and laminated. A flitch processing step (D in the same figure) in which the flitch 5 is obtained by pressing and adhering the flitch 5 with a colored resin paper 3 for the material part interposed therebetween, and a cutting step (E in the same figure) in which the flitch 5 is sliced from a certain direction. It consists of

In this way, the bleached wood veneers 1 are sorted into several groups according to the degree of bleaching, and these wood veneers 1 are dyed under the same dyeing conditions. A difference occurs in the degree of staining among the selected wood veneers 1 having different degrees of decolorization, and these wood veneers 1 with different dyeing times are divided into groups in the decolorization treatment veneer sorting process.

This can be seen on the surface of artificial decorative veneers obtained by laminating and press-bonding materials that belong to groups 1 and 2 in appropriate combinations so that they are mixed with materials that belong to other groups. Among the wood grain patterns, each spring wood layer expressed by the wood material veneer 1 has a different color distribution, and an artificial decorative veneer with excellent multicolor appearance can be obtained.

In addition, in order to impart a multicolor feel to such a wood grain pattern, it is possible to dye the wood veneer 1 under one dyeing condition without having to divide the wood veneer 1 into various dyeing conditions. It has the advantage of being extremely simple.

Furthermore, since it allows for variations in the degree of decolorization without paying attention to ensuring that the conditions such as the decolorization bath 2 and the materials of the wood veneer 1 used are the same, the decolorization process becomes easier. Therefore, it is possible to suppress a decrease in the usage yield of wood material veneer due to defective decolorization.

In another embodiment of the present invention, the wood veneer to be decolorized in the decolorization step in the above embodiment is boiled in an alkaline aqueous solution in a previous step.

An aqueous solution containing soda ash, sodium tripolyphosphate, and a nonionic surfactant is used as the alkaline aqueous solution, and is boiled for 4 to 6 hours at pH 9.0 to 10.0 under hot and cold conditions at 95°C.

In the decolorization process, the wood veneer that has been boiled in an alkaline aqueous solution is treated with H2O22-3 stabilizers (water glass, magnesium sulfate, etc.).
．． Temperature 60 in a decolorizing bath with pH 9.5 to 10.0 in which Co. 5 was dissolved.
Decolorization treatment is performed by immersion under conditions of ~70°C.

The other steps are the same as in the previous example. in this way,
By boiling the wood veneer in an alkaline aqueous solution before decolorizing it, it not only removes the resin that adheres to the wood veneer, but also removes the radiant fiber structure of the wood veneer. The cells are well lysed, the filling substance is eluted, and the alkaline substance is filled into the fiber structure of the wood veneer. The penetration of hydrogen peroxide, which is the main component of the decolorizing bath, into the fiber tissue and the oxidation reaction are promoted, and the bleaching process is carried out quickly and effectively. Even in cases where there is a difference in the degree of decolorization, there is no difference in the degree of decolorization that is seen when direct decolorization is performed without pretreatment as in the past, and the decolorization is done uniformly and in a short time (in the case of the conventional method, 3 ~
In this embodiment, the decolorization process that previously required 4 hours can now be carried out in about 2 hours, which greatly simplifies production.

Further, there is no problem such as deterioration in strength of the bleached wood veneer, which is the case with conventional methods in which hypochlorous acid is used as the main component of the bleaching bath to increase the bleaching effect.

In the above examples, the hydrogen peroxide concentration of the decolorizing bath in the decolorizing process was adjusted to a range of 0.5 to 1.5, and the wooden material was immersed in the decolorizing bath for 2 to 4 hours. The board can be bleached yellow.

That is, by boiling in an alkaline aqueous solution, the alkaline substance penetrates into the inside of the radial fiber structure, etc., and the wooden material veneer is exposed to the decolorizing bath with a hydrogen peroxide concentration of 0.5 to 1.5 degrees. The reaction produces a yellow color rather than a strong white color.

In addition, the degree of bleaching under the above decolorization conditions is determined according to JIS Z873.
0 of ULC8 display system, a.

When numerically displayed using the b system (...inter color difference formula), the following is obtained.

L-85~90 a--3~-2 b-25~28 However, the L value indicates lightness, the a value indicates chromaticity (degree of redness), and the b value indicates saturation (degree of yellowness). , The larger the a value is, the less red the color is (, The larger the b value is, the less the yellow color is.

In this way, by bleaching wood veneer yellow in the decolorization process, if you want to reproduce a natural wood with a relatively strong yellow tone, such as zelkova wood, you can bleach the wooden veneer to yellow in the decolorization process. Compared to the case of dyeing by blending many types of dyes, such as dyes, there are fewer types of dyes to be blended for yellow dyes, and the dye bath can be prepared, so it is possible to adjust the quantity of dye, etc. This method has the advantage that the work in the dyeing process is greatly reduced.

Since the yellowing of the wood veneer in this decolorization process is carried out after the previous process of boiling in an alkaline aqueous solution, differences in the fiber structure of the wood, such as the sapwood and heartwood, Can be processed uniformly without being affected.

As described above, the method for manufacturing artificially decorated veneer of this invention is as follows:
A decolorization process in which wood veneers are decolorized, a decolorization veneer sorting process in which the wood veneers are sorted into multiple groups according to the degree of decolorization, and a decolorization veneer separation process in which each group is separated. A dyeing process in which wood veneers sorted into different groups are dyed under the same dyeing conditions for each group, and after the dyeing process, wood veneers from each group are mixed with wood veneers from other groups. The process involves a flitch processing process in which flitches are obtained by combining and laminating the flitches and bonding them together, and a cutting process in which the flitches are sliced, resulting in color differences in the artificially decorated veneers produced between lots. The present invention has the effect that it is possible to extremely easily produce an artificially decorated veneer with a rich natural feel, which has a change in color tone in each spring part of the wood grain pattern on the wood surface, without causing product variations.

[Brief explanation of drawings]

The figure is a manufacturing process explanatory diagram showing an embodiment of the present invention. 1...Wood material veneer, 2...Decolorizing bath, 3...Colored resin paper 4...Irregular shape, 5...Flitch.

Claims (1)

[Scope of Claims] 1. A decolorizing process for decolorizing wood veneers, a decolorizing veneer sorting process for sorting the wood veneers into groups in multiple stages according to the degree of decolorization, and a decolorizing process for decolorizing wood veneers. A dyeing process in which the wood veneers sorted into groups in the board sorting process are dyed under the same dyeing conditions for each group, and after the dyeing process, the wood veneers of each group are dyed under the same dyeing conditions. A method for manufacturing an artificial decorative veneer, which includes a flitch processing step in which material veneers are combined and laminated so as to be mixed with each other and pressed and bonded to obtain a flitch, and a cutting step in which the flitch is sliced. 2 The wood material veneer to be bleached in the bleaching process is:
2. The method for producing an artificially decorated veneer according to claim 1, which comprises boiling in an alkaline aqueous solution in the preceding step.