JPS5847329B2 - Manufacturing method of dyed veneer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention ('!) relates to a method for producing dyed veneers used for producing laminated decorative veneers and the like.

Dyed veneers used in the manufacture of laminated decorative veneers and the like have been obtained in the following manner.

That is, it was obtained by placing a dye solution having a target color tone in a boiling tank and soaking the wood veneer for 3 to 8 hours to dye it.

However, the dyed veneer thus obtained had a problem in that there was a color difference (E) of 20 or more between the surface and the inside.

This is thought to be due to excessive selective adsorption of the dye to the surface of the veneer during dyeing, and at the same time slow diffusion of the dye from the surface to the interior.

In addition, when dyeing wood veneers as described above, if the wood veneers obtained from the sapwood and the wood veneers obtained from the heartwood are dyed at the same time, the wood veneers obtained from the heartwood will be dyed. Because the penetration of the dye into the wood veneer is worse than that of the wood veneer obtained from sapwood, there is also the problem that the color difference JE between the internal color of the heartwood wood veneer and the internal color of the sapwood wood veneer is 7 or more. was.

The inventors conducted a series of studies while taking into account that wood veneers are dyed using a high-temperature dye solution.

As a result, if a nonionic surfactant with a large HLB, especially a polyoxyethylene alkyl ether surfactant with an HLB of 15 or more, is added to the dye solution, even if the dye solution is at a high temperature, the inside of the veneer will be affected. At the same time, the selective adsorption of the dye to the surface of the veneer is suppressed, and the wood veneer is evenly dyed. It was found that the internal color difference between the sapwood material and the sapwood material was significantly reduced, leading to the development of this invention.

That is, the present invention is a method for producing a dyed veneer in which a dyed veneer is obtained by immersing a wood veneer in a dye solution and dyeing it, and the dye solution is a polyoxyethylene alkyl ether surfactant with a large HLB. The gist of this is to use a product that contains the agent.

The surfactant used in this invention has a structure of polyoxyethylene alkyl ether among nonionic surfactants, and has a structure of HL B (Hydrophi 1eLipop).
hile Balance) is large, preferably HLB is 15 or more.

These surfactants maintain a strong affinity with dyes even when the dye solution is at high temperatures, so they can rapidly capture dye molecules that attempt to dye the surface of the veneer in the solution. It works to prevent staining and gradually feed the dye into the veneer.

Therefore, surface darkening due to excessive dye adsorption on the surface of the veneer is prevented.

Additionally, this surfactant has excellent permeability, which helps the dye to diffuse from the surface of the veneer into the interior.

Therefore, the interior of the veneer is sufficiently dyed, and the dye penetrates into the interior of the veneer.

Therefore, by using such a surfactant, the color difference between the surface and inside of the wood veneer and the internal color difference between the heartwood and sapwood veneers are significantly reduced, resulting in uniformly dyed veneers. This will allow you to obtain a board.

Next, examples will be described together with comparative examples.

Examples 1 to 3, Comparative Examples 1 to 3 A 0.8 rhyme thick rotary veneer made of South Sea hardwood Aius wood,
The veneer collected from the periphery of the log is used as sapwood, and the veneer taken from the vicinity of the peeled core is classified as heartwood, and a dye solution containing 0.1% of the surfactant shown in Table 1 below is used. It was stained under the following conditions.

*(Dyeing conditions) Next, the obtained dyed veneer was divided into sapwood and heartwood, and the color tone of the surface and interior (1/2 part polished) of each was measured using a spectrophotometer. The color difference between the surface and the inside of the heartwood itself was determined, and the color difference between the inside of the sapwood and the inside of the heartwood was also determined and explained in Table 1.

As is clear from the table, the examples are superior in that the color difference between the surface and interior of the same material is smaller than that in the comparative example, and the internal color difference between the sapwood and the heartwood is also small.

In addition, among polyoxyethylene alkyl ether surfactants, one with a lower polymerization degree of ethylene oxide, which is a hydrophilic group, and an HLB of 11 was used, and this was compared with an example using one with an HLB of 15. It is shown in Table 2.

As is clear from the table, the example using HLB15 is more effective in dogs.

This is because the hydration between the ether bond of the ethylene oxide group and the water molecules is strong and difficult to break even at high temperatures, so this effect is strong (the activity of the resulting product with a high HLB is retained more strongly even at high temperatures). This is thought to be because the

Claims (1)

[Scope of Claims] 1. A method for producing a dyed veneer in which a dyed veneer is obtained by immersing a wood veneer in a dye liquid and dyeing the wood veneer, wherein the dye liquid contains H.
A method for producing a dyed veneer characterized by using a polyoxyethylene alkyl ether surfactant having a large LB. 2. Claim 1, wherein the polyoxyethylene alkyl ether surfactant has an HLB of 15 or more.
Manufacturing method of dyed veneer as described in section. 3. The method for producing a dyed veneer according to claim 1 or 2, wherein the dyeing liquid is heated to a high temperature.