JPS6096405A - Method of decoloring wood - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] 〔Technical field〕 This invention relates to a method for decolorizing wood.

[Background technology]

BACKGROUND ART Wood with wood grain on its surface has traditionally been preferred as a building material for the interior of houses. However, since using natural wood is very expensive, generally, building materials with artificial decorative veneers pasted on the surface are mainly used.

Artificial decorative veneers are obtained by decolorizing and dyeing raw material veneers sliced from cheap lumber from trees, and then slicing flitches made by laminating and molding the veneers.

In the past, even though each material veneer had a different color, the same bleaching process was applied to each material veneer, so the color tone of the material veneer after bleaching could be different. there were. If the same amount of decolorizing agent was applied to all veneers, the degree of decolorization of the veneers after decolorization would vary.

[Purpose of the invention]

Therefore, an object of the present invention is to provide a method for decolorizing wood that does not cause variations in the degree of decolorization among the pieces of wood after being bleached.

[Disclosure of the invention]

The inventor has made extensive studies to achieve the above objectives,
completed this invention.

This invention is a wood skin coloring method for obtaining bleached wood by applying a bleaching agent to the wood and leaving it to stand, and is characterized by adjusting the amount of the bleaching agent applied according to the color value of the wood. Its gist is a method for decolorizing wood. This will be explained below based on an example.

The color value of the material veneer is measured, and the amount of skin coloring agent applied is determined according to the measured value. For example, for a material veneer whose L half value (brightness) is 75 or less, the concentration is 3 to 5% by weight.
alkaline solution at 115-145 g/rd, concentration 50-
85-100 g/60% by weight (7) H, O, aqueous solution
For material veneers coated with rd and having an L* value of 75 or more,
Decolorization treatment is performed by applying an alkaline solution and H, O, and aqueous solutions each having the same concentration as above, with the amount applied being half of the above amount.

Below, color values are listed in a table for the above examples and comparative examples in which the same amount of decolorizing agent was applied regardless of the Lm value. In addition, in this experiment, the B electric value (yellowness) is used for reference.
I also took a look at this. Example 1. The coating amounts of II and Comparative Examples i, n, m, rv were the same, and Example III
, which is twice the coating amount of IT.

(Margin below) Table 1 As shown in Table 1, the L electric value,
The difference in both B* values was small.

In the above embodiment, only the L electric value was used as the standard, but other A value (redness) or B electric value may be used as the standard, and L*
It is more preferable to adjust the application amount of the decolorizing agent by setting standards for both the A11 value and the B value. Further, in the embodiment, only one point from L to 75 was used as the reference point, but the number of reference points may be increased to finely classify the amount of the decolorizing agent applied. This allows for finer differences in color values between bleached veneers.

In the embodiment, a veneer was used as an example of the material to be bleached, but it goes without saying that the bleaching treatment may be applied to other wood materials.

〔Effect of the invention〕

As described above, the method for decolorizing wood according to the present invention is a method for decolorizing wood by applying a decolorizing agent to the wood and then leaving it to obtain bleached wood. Since it is characterized by adjusting the amount, there is no variation in the degree of bleaching among the pieces of wood after bleaching, and the resulting wood has a uniform color tone, making post-treatment easier.

Claims (1)

[Claims] +11 A method for decolorizing wood by applying a decolorizing agent to wood and then leaving it to obtain decolorized wood, which method is characterized by adjusting the amount of the decolorizing agent applied in accordance with the color value of the wood.