JPS6124404A - Method of dyeing 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 dyeing wood veneers used in the production of laminated veneers.

(Background technology) A printing method is used as a method for dyeing wood veneers.

In the textile printing method, a dyeing solution is first applied to the surface of the wood veneer, and a roll coater is generally used in view of the viscosity of the dyeing solution, the amount of application, and the ease of handling the equipment.
(Due to unevenness of the surface of the wood veneer or variations in moisture content)
Variations in the amount of application occur. Variations in the amount of coating directly lead to uneven dyeing, so in order to achieve uniform dyeing, it is necessary to reduce the variation in the amount of coating. Among the causes,
Irregularities on the surface of the wood veneer cannot be avoided as long as the wood veneer is manufactured using a rotary machine.

(Objective of the Invention) The present invention was proposed in order to improve the above-mentioned drawbacks, and it is possible to uniformly dye a wood veneer by reducing uneven application of a dye solution to a wood veneer in a textile printing method. The purpose is to achieve this goal.

(Disclosure of the Invention) In order to achieve the above object, the present invention applies printing to one or both sides of a synthetic resin sheet, then overlaps the printed surface on the surface of a wooden veneer, and cures it under moist heat while pressing. The gist of the invention is a method for dyeing wood veneer, which is characterized by transferring the print using a method of printing. In other words, by forming a dye layer on a hydrophobic sheet, transferring the dye to the wood surface, and allowing the dye to penetrate and diffuse into the wood, uneven coating of the dye due to unevenness on the wood surface can be avoided. It can be avoided.

Since the hydrophobic synthetic resin sheet is uniform in both material and thickness, it is easy to form a uniform dyeing solution layer on this sheet.

(Example 1) Example 1 consists of the following steps.

(b) Preparation of staining liquid transfer sheet (b) Heat curing of wood veneer and dye liquid transfer sheet.

Next, each process will be explained.

(a) Preparation of dye liquid transfer sheet A hydrophobic synthetic resin sheet that can withstand 100°C, such as polypropylene or polyester, is used as the sheet. As the dyeing solution, an acid dye or a direct dye is used by dissolving it in a solution containing water and a thickener. As the thickener, carboxyl methyl cellulose, sodium alginate, methyl acrylate, polyethylene glycol, glycerin, etc. are used. This dye liquid is applied onto a sheet (on one side or both sides) using a roll coater, percoater, etc. to obtain a dye liquid transfer sheet.

(B) Heat curing of the wood veneer and the dye liquid transfer sheet (B) The dye liquid transfer sheet produced in (a) is stacked between wood veneers whose moisture content has been adjusted to approximately 100%.
Tighten with a pressure of about V-. This is placed in an airtight container and heated and cured while humidifying the wood veneer appropriately to prevent the moisture content from decreasing.

At this time, since the dye liquid transfer sheet is sandwiched between the wood veneers, the hydrophobic synthetic resin of the transfer sheet prevents the dye from moving between the wood veneers, so do not sandwich the sheet between the wood veneers. When curing with heat, the internal color variation of wood veneers within a stack book becomes smaller compared to the case of normal textile printing and dyeing.

(Example 2) Dye transfer sheet different from Example 1) When applying K dye, a pattern is printed. If this dye transfer sheet is heated and cured in the same manner as in Example 1, pattern dyeing can be applied to the interior of the wood veneer. Of course, it is difficult to create a fine pattern, but it is possible to create a pattern with a resolution of about 10 crn.

In the above description, the method for dyeing wood veneers has been described, but the present invention can also be applied to dyeing wood veneers used in the manufacturing method of laminated veneers.

(Effects of the Invention) As described above, the present invention applies printing to one or both sides of a synthetic resin sheet, then overlaps the printed surface on the surface of a wooden veneer, presses it tightly, and cures it with moist heat. By transferring the printing, (a) It is possible to uniformly dye the interior of the wood veneer.

(b) It is possible to dye the pattern to the inside of the wood veneer.

It is a stone that has the following effects.

Claims (1)

[Claims] A method for dyeing wood veneers, which is characterized by printing on one or both sides of a synthetic resin sheet, then stacking the printed surface on the wood veneer surface, and curing with moist heat while pressing to transfer the printing. .