JPS592602B2 - Decorative veneer manufacturing method - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a method for manufacturing decorative veneer in which a decorative veneer with a wood grain pattern is created by processing and rolling a material veneer, and its purpose is to improve crack resistance and other properties. We aim to widely provide a manufacturing method for decorative veneers with improved physical performance, thereby contributing to the development of this industry.

Conventionally, when creating this type of decorative veneer, a large number of material veneers of a predetermined size obtained by rotary cutting raw wood are laminated with adhesive interposed between them, and then the material is laminated at 15 Ky/i or more from the top and bottom. Compressing at a pressure of 25 to 9/crti and curing the adhesive to form a flitch;
The flitch was then sliced into thin pieces to obtain a decorative veneer with a wood grain pattern.

A specific example of a technique similar to the above-mentioned conventional technique is ``Method for manufacturing a decorative veneer'' disclosed in Japanese Patent Application Laid-Open No. 49-48807.

However, the decorative veneer obtained by the above-mentioned conventional manufacturing method has poor crack resistance and is prone to cracking due to slight environmental changes or during processing in the next step.

This is because the main purpose of forming the flitch is to allow the adhesive to harden smoothly.

Furthermore, as a prior art example of the present invention, Japanese Patent Application Laid-Open No. 54-2309
There is a "method for manufacturing plywood" disclosed in the publication,
This technique involves [temporarily tightening with a hot platen pressure of 2 to 5 K9/crlt to actively bond the adhesive and powder, then completely removing the hot platen pressure to open the gap between the hot plates and air drying to soften the material. Rapidly evaporate and dehydrate the excess water of 7 to 12 to 9
The plywood manufacturing method is disclosed in detail, "Final tightening is strongly applied with AO hot plate pressure to gradually heat cure the adhesive and powder affinity," but its purpose is to tighten the intermediate product after temporary bonding. This is an improved control method for processing during hot pressing using a hot press, and it is completely different in purpose, structure, and effect from the decorative veneer manufacturing method in which flitches that have been pressed and integrated are cut into thin pieces. This can be said to be an example of prior art that is completely different from the main objective of the present invention, which is to improve the crack resistance of decorative veneers.

Hereinafter, the present invention will be explained in detail based on the drawings of actual cases shown in FIGS. 1 to 5.

In the present invention, raw wood 1 such as jelutong wood or agathis wood is rotary cut and cut into a predetermined size to have a thickness Q,
A large number of veneers 2 of material between 5+oa and 2.0 oa are produced.

Next, an appropriate amount of adhesive 3 made of phenol resin, urea resin, urethane resin, etc. is applied to one side of the material veneer 20, and a large number of material veneers are bonded with one side coated with adhesive 3 in the same direction. 2, 2... are laminated, and a pair of presses 4, 4 having concave and convex shapes having male and female relationships on the corresponding inner surfaces from the upper and lower directions are used to apply pressure 1.
Pressing is performed at a low pressure of 5 Kg/crti to 25 Kg/crA to harden the adhesive 3 interposed between the material veneers 2 and 2.

Next, the clamping pressure of the presses 4, 4 was set to 50 Kq/cri,
A large number of laminated and integrated raw material veneers 2.2 are re-pressed under high pressure of 60 fy/c4.

A suitable time for this high pressure compression is 5 minutes to 15 minutes.

The flitch 5 thus formed is sliced into thin pieces to obtain a decorative veneer 6 having a thickness of 0.2 m7IL to 0.5 mrlL.

In the figure, 7 is a roll coater that applies the adhesive 3 to the raw material veneer 2.

It is desirable that the pressure when re-compressing at a high pressure be such that the wood fiber structure of the material veneer is not destroyed.

The present invention is constructed as described above, and the crack resistance of the decorative veneer obtained by the present invention is higher than that of the decorative veneer produced without going through a high-pressure re-pressing process. It has the effect of having about twice the strength.

This unique effect can be achieved because the method for manufacturing decorative veneers of the present invention uses a two-step pressing process of low pressure and high pressure to harden the adhesive and strengthen the material veneer. It is.

[Brief explanation of the drawing]

Figures 1 to 5 are drawings related to the method for manufacturing decorative veneers of the present invention, in which Figure 1 is a perspective view of the main parts showing a state in which raw wood is rotary cut, Figure 2 is a perspective view of the material veneer, Figure 3 is a side view showing how adhesive is applied to a veneer of material, Figure 4 is a side view showing how a flitch is formed, and Figure 5 is a perspective view of main parts showing how the flitch is sliced into thin pieces. It is a diagram. 1... Log, 2... Material veneer, Total... Adhesive material, 4...
... Press, 5... Flitch, 6... Decorative veneer.

Claims (1)

[Scope of Claims] 1. In a decorative veneer manufacturing method in which a large number of material veneers are laminated with adhesive and pressed together to create a flitch, and then the flitch is cut into thin pieces, After pressing together multiple veneers at low pressure and allowing the adhesive to harden. A method for manufacturing decorative veneers that is characterized by re-pressing under high pressure.