JPS5844050B2 - How to dye wood veneer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for dyeing wood veneers.

Traditionally, in order to manufacture decorative veneers with a straight-grain pattern made of carpenter's precious wood, such as Koematsu, it is necessary to add spring wood colored veneers to light-colored material veneers.
The colors of autumn wood are individually dyed and laminated, or two veneers are layered and dyed to express the spring wood color and autumn wood color within one veneer. There is.

However, there was a problem in that colored woods such as agathis wood and potocarpus wood could not be used as materials for such decorative veneers.

Therefore, it is an object of the present invention to provide a method for dyeing a wooden board, which allows colored wood to be used as a decorative veneer material.

That is, the present invention is characterized in that after a colored veneer is decolorized, it is subjected to a reduction treatment with a decolorizing agent and a dyeing treatment. It can be used as a material for any artificial precious wood by dyeing it afterwards.

After this decolorization treatment, the veneer is post-treated to remove the excess active ingredient of the decolorization agent and the extraction valve, and then dye the spring wood part for precious wood, and add autumn wood color to the surface. A large number of veneers are coated and dyed, and then treated in the same way. They are laminated and pressed so that the spring wood color and the fall wood color alternate, and are made into blina. They are then sliced at any angle to make decorative veneers. can be finished.

Further, after the decolorization treatment, the veneer may be dyed and removed at the same time using a staining solution containing a post-treatment agent to remove the excess active ingredient of the decolorization agent and the extraction valve.

In this case, the treatment solution is preferably a dyeing solution containing a metal complex dye, an acid dye, etc., mixed with an appropriate amount of a heavy metal compound such as ferric sulfate, copper sulfate, or lead sulfate.

After dyeing, the veneer is finished as a decorative veneer through the same laminating and slicing processes as described above.

Example 1: A veneer made of agathis material and having a thickness of LO mm and 0.8 mm was decolored under the following conditions.

Treatment liquid: Hydrogen peroxide...3 Sodium dasilicate...1.0% Magnesium sulfate...0.04% PH: 10 Bath ratio: 30 Liquid temperature: 60°C Treatment time: 4 hours Then, this decolorization was carried out. The veneer was post-treated under the following conditions, and a veneer with an L value (lightness) of 75 or more was obtained.

Post-treatment liquid: Sodium sulfate (Na2803)...0.3
% Bath ratio: 30 Liquid temperature: 100°C Treatment time: 1 hour This bleached veneer was dyed under the following conditions to obtain a dyed veneer with a color tone very similar to the color of Koematsuharu wood.

Dye Nisminol Milling Brown 3G (A-28
9: Sumitomo Chemical Co., Ltd.) 95 parts Ranil Brown 7R (A-295: Same as above) 5 parts...0.02 multi-bath ratio: 30 Liquid temperature: Boiling treatment time: 4 hours Furthermore, this dyed veneer was subjected to moisture content After printing to 200 to 300 coats, the next printing liquid is applied to one side to give the autumn wood color, and then they are laminated and pressed using a urethane adhesive so that the spring wood color and the autumn wood color are alternated. , created Flitch.

Printing liquid: C, 1, acid brown 13...2 polyC,
I, Acid Brown 19... 0.05% Sodium alginate... 1 The decorative veneer obtained by slicing flitch closely resembled natural Koematsu.

Example 2: A veneer made of agathis material and having a thickness of LO mm was uniformly decolored to the inside of the veneer under the following conditions.

Treatment liquid: hydrogen peroxide...3% sodium silicate (Na20.3SiO2)...3% magnesium sulfate...0.04% PH: 10 Bath ratio: 30 Liquid temperature: 60°C Treatment time: 4 hours Next, this bleached veneer was treated under the following conditions to obtain a dyed veneer.

Dye Nisminol Milling Brown 3G (A-28
9) ... o, t% Ranil Brown 7R (
A-295) ... 0.05 copper sulfate: 0.01 steamed water ratio: 30 Liquid temperature: Boiling Treatment time: 4 hours Because post-treatment and dyeing were performed at the same time with such a treatment solution, the The metal ions accelerate the decomposition of excess hydrogen peroxide contained in the decolorized veneer, eliminating the effect on dyeability.In addition, the metal ions that have penetrated into the interior of the veneer are oxidized by the excess hydrogen peroxide, and the dye The combination of coloring with metal oxide and metal oxide produced a more excellent and subtle color tone.

Furthermore, metal complex dyes are usually heavily adsorbed on the surface of the veneer,
Although it is difficult to uniformly dye the interior of the veneer, the use of heavy metal copper ions improves permeability and allows uniform dyeing to reach the interior of the veneer.

Comparative Example: A 1.0 mm thick veneer made of agathis material was bleached under the same conditions as in Example 2, and subsequently dyed under the following conditions.

Dye Nisminol Milling Brown 3G (A-28
9) ...Nil Brown 7R enjoying o, (
A-295)...0.05 Surfactant: Sumipon WB (manufactured by Sumitomo Chemical Co., Ltd.)...
0.1 Bath Ratio: 30 Liquid Temperature: Boiling Treatment Time: 4 hours In this dyeing, a part of the dye is subjected to the decomposition of residual hydrogen peroxide during the decolorization treatment, resulting in a decrease in dyeability, and at the same time, a surfactant is added. Despite this, it was highly adsorbed to the surface of the veneer, making it impossible to dye the inside of the veneer uniformly.

Comparative Example 2: Prior to dyeing in Comparative Example 1, the decolorized veneer was boiled in a 0.3φ solution of sodium sulfate, but the dyeability was not improved and it was not possible to dye the inside uniformly.

Claims (1)

[Scope of Claims] 1. A method for dyeing a wood veneer, which comprises decolorizing a colored veneer and then subjecting it to a reduction treatment with a decolorization agent and a dyeing treatment. 2. The method for dyeing a wood veneer according to claim 1, wherein the reduction treatment of the decolorizing agent and the dyeing treatment are carried out in this order. 3. The method for dyeing a wood veneer according to claim 1, wherein the reduction treatment of the decolorizing agent and the dyeing treatment are carried out in the same bath.