JPS6153006A - Method of dyeing wood veneer - 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 dyeing wood veneers.

[Background technology]

In recent years, due to the depletion of wood resources, high-grade precious woods are becoming scarcer, their prices are rising, and their uses are becoming narrower.

For this reason, various improvement techniques have been developed to make effective use of wood resources. For example, a wood veneer is made by rotary-cutting low-grade water such as South Sea lumber, which is then bleached and dyed. Multiple sheets are then stacked with adhesive and pressed together using a pair of uneven molds to create a laminated flitch. One example of this is the development of technology to create laminated decorative veneers that resemble high-grade precious woods by slicing them.

However, this method has the problem that the dyeing of the material is not sufficiently uniform, resulting in color unevenness and color variation, which impairs the natural look. This is because the permeability of the dye into the wood veneer is uneven due to the fiber structure of the wood. [Object of the Invention] An object of the present invention is to provide a method for dyeing a wood veneer that can uniformly dye the wood veneer and reduce color unevenness and color variation of the wood veneer.

[Disclosure of the invention]

The method for dyeing a wood veneer according to the present invention is characterized by dyeing the wood veneer with a dyeing liquid containing a surfactant and an alkali, after decolorizing the wood veneer if necessary.

In this way, by dyeing with a dye solution containing surfactant and alkali, the eluted components and resin components in the wood veneer are removed, and the affinity with the dye is improved, which improves the permeability of the dye. This allows for uniform dyeing with no uneven color.

The surfactant used is preferably a nonionic or anionic surfactant, but is not particularly limited. Examples of nonionic surfactants include polyoxyethylene octylphenol ether, polyoxyethylene sorbitan monolaurate, and polyoxyethylene/polypropylene brosulfonate polymer, and examples of anionic surfactants include dialkyl sulfosuccinate esters. Examples include sodium salt, sodium dodecylbenzenesulfonate, sodium alkylmethyltaurate, and sodium dioctylsulfosuccinate.

Further, as the alkali, it is particularly preferable to use a weak alkali. Sodium carbonate can be suitably used as the weak alkali, but other weak alkalis such as aqueous ammonia and calcium hydroxide can be used.

Sodium silicate and the like can also be used. Furthermore, strong alkalis such as sodium hydroxide and potassium hydroxide can also be used if the concentration is low.

Example: Rotary cutting veneer of Agatis wood with a thickness of 1
After decolorizing by immersing in 2% hydrogen peroxide solution of H9.5 at 60°C for 3 hours, 1% sodium alkylthimethyltaurate and sodium carbonate were added to 0.2% Suminol Milling Brown 5R aqueous solution. Staining was carried out at 95-100°C for 3 hours. As a result, the veneer was dyed evenly to the inside, with very little unevenness in color.

〔Effect of the invention〕

According to this invention, by dyeing a wood veneer with a dyeing liquid containing a surfactant and an alkali, it is possible to dye the wood veneer uniformly and with less unevenness to the inside of the wood veneer.

Claims (2)

[Claims] (1) A method for dyeing a wood veneer, which comprises dyeing the wood veneer with a dye solution containing a surfactant and an alkali. (2) The method for dyeing a wood veneer according to claim (1), wherein the alkali is a weak alkali.