JPS59209813A - Method of improving and treating formation of figure of woody 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] The present invention relates to a method for improving the grain of a wooden veneer used as a plate for decorative plywood. [Background Art] Decorative plywood is produced by attaching a plate to the surface of the plywood. It is formed by slicing natural wood as a plate for high-quality decorative plywood.
Quality veneer is used. In addition, when trying to use cheap wood veneers such as Japanese pine as wood veneers, these wood veneers do not have a wood grain pattern or grain pattern. It could not be used for high-grade decorative plywood. Therefore, an attempt was made to color the wood veneer with heat burnt to reduce the graininess of the wood veneer, but it was not possible to sufficiently reduce the graininess of the wood veneer.

[Purpose of the invention]

The non-invention was made by considering the above points,
It is an object of the present invention to provide a method for treating the wood grain of a wooden veneer, which can avoid the grain of the wood veneer whose grain is not clear.

[Disclosure of the invention]

However, the method for improving the graininess of a wooden veneer according to the present invention is characterized by bleaching the wooden veneer and then subjecting it to a coloring treatment, and with this configuration, the above object has been achieved. Hereinafter, the present invention will be explained in detail by way of examples.

First, the wood veneer is bleached as shown in the process diagram of FIG. For bleaching, use a hydrogen peroxide solution or commercially available bleach (Nitto Kagaku Co., Ltd.'s Select Preach, Daino Shinko Co., Ltd.'s Chiku-Mishi 50).
This is done by immersing a wooden veneer in a bleaching solution prepared with a solution of (0, etc.) and then applying the bleaching solution to the wood veneer. The pH of the bleaching solution is preferably adjusted to about 9-12. By performing the bleaching treatment in this manner, the P bisulfate and oil content in the wood veneer are removed, and the uneven color of the wood veneer is also removed. Next, after washing this wood veneer with water, the wood veneer is colored. For coloring treatment, use sulfuric acid solution, hydrochloric acid solution, sodium chlorate solution, or a commercially available coloring agent (
Dog I! A wood veneer is soaked in a coloring solution prepared with a solution of Coloramine S (produced by Shinkosha Co., Ltd., etc.), and the coloring solution is applied to the wood veneer. It is a product that develops color by coloring the ingredients. The pH of the coloring liquid is preferably adjusted to 1 to 2. Here, the graininess of the wood veneer is caused by the fact that the spring wood has a low tissue density and is pale in color, while the summer wood has a large tissue density and is dark in color. The idea is to improve the visibility of the wood by increasing the difference in color tone between the wood veneer and the summer wood, but the wood veneer is bleached before being colored, In addition to eliminating variations in color, this bleaching process also makes the summer wood with a dense structure porous, making it easier for the coloring solution to penetrate, which improves the degree of coloration in the summer wood. It is possible to improve the grain of the wood because it can be carved. After coloring in this way, the wood veneer is washed with water and dried to finish.

FIG. 2 shows a process diagram of another embodiment of the present invention, in which a wooden veneer is treated with alkali before bleaching. Alkaline treatment is performed by soaking a wooden veneer in an alkaline solution with a pH of 1 to 1, such as a sodium hydroxide solution, and applying an alkaline solution to the wood veneer.This alkaline treatment improves the bleaching effect during bleaching. It is something that can be improved. Further, in the embodiment shown in FIG. 2, after the coloring treatment, the wooden veneer is further subjected to an alkali treatment and a bleaching treatment. After this coloring treatment, the color of the spring wood is bleached and the grain of the wood is further improved by applying the re-drying white treatment after the coloring process (the summer wood has a honey-like structure and is therefore difficult to receive bleaching action). The best thing is to let it happen.

Similarly, when bleaching wood veneers with a bleaching solution such as a hydrogen peroxide solution, simply immersing the wood veneer in a bleaching tank may not allow the bleaching solution to act uniformly on the wood veneer, resulting in uneven bleaching. I criticize. In this case, as shown in Fig. 5, a liquid supply tact (3) having liquid supply holes (2) on the entire surface at both ends of the bleaching tank (1) and a liquid suction tact having liquid suction holes (4) on the entire surface. 6) and the left and right facing each other and hit the liquid supply tact (
3) and the liquid suction tact (5) are connected with a pi") fel, and a bong "j (7) is attached to the middle of the pipe (6). In this one the pump (7)
As a result, the bleaching solution in the bleaching tank (1) is sucked through the liquid suction hole (4) and discharged from the liquid supply hole (2), resulting in a uniform bleaching solution in the bleaching tank (1). It is possible to generate a flow and cause the bleaching solution to act uniformly on the wood veneer A, thereby achieving uniform bleaching.

〔Effect of the invention〕

As described above, in the present invention, since the wood veneer is bleached and then subjected to color development treatment, the color of the spring wood portion of the wood veneer, which is easily affected by the bleaching solution, can be removed by the bleaching process. By making the wood veneer porous, it is possible to make it easier for the coloring liquid to act on the summer wood area, and it is possible to sharpen the difference in color tone between the spring wood area and the summer wood area and improve the grain of the wood. However, it is now possible to use wood veneer, a material that has traditionally only been used as a low-grade product, as a high-quality product. Furthermore, processing can be done by bleaching or coloring, making it possible to process large quantities.

[Brief explanation of drawings]

Fig. 1 is a process diagram of one embodiment of the present invention, Fig. 2 is a process diagram of another embodiment of the same, and Fig. 5 is a partially cut-out perspective view of an embodiment of the apparatus used for bleaching in the same. In this case, A is a wooden veneer. Agent Patent Attorney Choshichi Ishi

Claims (1)

[Claims] (1) A method for improving the grain of a wood veneer, which is characterized by bleaching the wood veneer and then subjecting it to color development. A method for improving the graininess of a wooden veneer as set forth in claim 1. (3) A method for improving graininess of a wooden veneer as set forth in claim 1. The treatment method for improving the graininess of wood veneer as described in Section 2.