JPS58191102A - Manufacture of aggregate decorative 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 [Objective] This invention relates to an improvement in the method of expressing wood grain patterns in laminated decorative veneers. Specifically, the purpose is to provide a method for expressing wood grain patterns with subtle color unevenness using laminated decorative veneer technology using relatively dark-colored materials such as natural striped ebony, rose, and teak.

[Background Art] Conventionally, in the production technology of laminated decorative veneers, the following methods can be considered as methods for expressing subtle color unevenness.

(i) A method in which a printing agent is further applied to the dyed veneer for partial printing (ii) A method in which multiple types of veneers are assembled (iii) The dyed veneer is unevenly dyed in another dyeing process However, with method (i) above, the printing was often limited to the surface of the veneer, and the printing process was quite complex, resulting in poor productivity.Furthermore, poor adhesion on the printed surface often occurred. .

In method (ii), the color tone varies intermittently on the adhesive surface, so it was impossible to express subtle color unevenness.

Furthermore, in method (iii), there are clearly two dyeing steps.
There were drawbacks such as the need for more than one application and difficulty in managing brown color. This invention was made in view of the above circumstances.

[Disclosure of the Invention] The present invention is characterized in that after dyeing a raw veneer with a dye having relatively poor dyeability, the dye is squeezed out together with a medium to create color unevenness.

Here, as the dye having relatively poor dyeing properties, for example, those having relatively poor dyeing properties for wood, such as aniline blank, cobalt complex dye, and nigrosine, are used.

The dye can be squeezed out by applying pressure with something like a roll press, or by using a centrifuge. Alternatively, elution may be performed using an N agent such as alcohol. However, these are examples and are not intended to be limiting.

Note that it is easier to create color unevenness by applying pressure. The medium mentioned is also usually the water of the dyebath.

In the case of squeezing out the medium by applying pressure, the pressure is preferably applied so that the moisture content of the veneer becomes approximately 80 to 100%. After the veneer has been treated with the media, it is preferably dried to reduce the moisture content of the veneer to 30.
~60%. The following is a conventional manufacturing process for laminated decorative veneer.

This method is relatively simple in terms of process, and because the dye moves with the movement of the medium, it has become possible to create very subtle color unevenness. In addition, the color unevenness occurs in the thickness direction and plane of the veneer, and even after flitching and slicing, the color unevenness always appears on the surface of the laminated decorative veneer. Example 1 The manufacturing procedure of Example 1, which will be described below based on Examples, is shown below.

i Decolorized agathis veneer was dyed with the following dye system: Cobalt complex dye (black) 1 part Cobalt complex dye (brown) 1 part water Ioo part Temperature
95±2° C. Bath ratio: 30 to 40 hours 2 to 4 hours 11 The above dyed veneers were pressurized with a roll press to bring the moisture content to 80 to 100%.

iii It was dried in a dryer until the moisture content was 40±5%.

■ It was assembled and flitched using a commercially available urethane adhesive.

■ I sliced the flitch.

When the laminated decorative veneer obtained above was evaluated, it was found that subtle color unevenness was expressed and it closely resembled natural striped ebony.

Example 2 A similar effect was obtained when a commercially available aniline blank was used instead of the Kobal monomer dye (black) of Example 1.

Example 3 The cobalt complex dye (black) of Example 1 was 5TP-
A similar effect was obtained by monozeta staining using black 16 (manufactured by Udogaya Kagaku ■).

- Example 4 It was confirmed that by squeezing out the medium using a centrifugal separator instead of step 2 of Example 1, it was possible to express even more subtle color unevenness.

Example 4 Instead of step 2 of Example 1, soak the veneer in alcohol,
After dissolving the medium, it was dried. The rest was the same as in Example 1. As a result, there was even more subtle color unevenness, resulting in something that closely resembled a natural rose decorative veneer.

[Effect] This invention is characterized by dyeing the raw veneer with a dye that has relatively poor dyeability (such as aniline black), and then squeezing out the dye together with a medium using a method such as applying pressure to create color unevenness. This makes it possible to express subtle color unevenness in a relatively simple process, and continuous color changes can be obtained, so the depth and texture of natural precious wood can be expressed even with laminated decorative veneer. It has become possible.

Patent applicant: Matsushita Electric Works Co., Ltd.

Claims (1)

[Claims] (1) Raw material veneers are dyed, laminated with an adhesive interposed, sandwiched between molds with uneven surfaces and pressed together to form flitches, and then sliced to produce laminated decorative veneers. A method for producing laminated decorative veneers, which is characterized in that raw veneers are dyed with a dye that has relatively poor dyeability, and then the dye is squeezed out together with a medium to create uneven coloring.