JPH0213613B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improved method for producing artificial wood grain decorative veneers, and the object thereof is to make the irregularities formed on the front and back surfaces of raw material veneers in a short period on the front and back surfaces of the veneers. The aim is to express the subtle and complex changes of natural wood tone in the wood grain pattern of the artificial wood grain decorative veneer by preventing them from appearing at the same time.

Up until now, attempts have not been made to create uneven shapes by embossing or other methods on the desired veneer surfaces of a large number of raw veneers that are laminated and bonded together in order to express fine changes in the grain pattern of artificial wood grain decorative veneers. Ta.

However, conventional embossing on veneers is carried out by passing the regular veneer through a pair of rotating embossing rolls with the same diameter facing each other, or by pressing the veneer with a flat embossing template. Because it is common, the uneven shapes formed on the front and back surfaces of raw material veneers appear repeatedly at the same time for each circumference of the embossing roll or template, and many of these raw material veneers are laminated with adhesive. When glued together and turned into frits, the adhesive layer is peeled off to create a wood grain pattern and made into a decorative veneer.The changes in the adhesive layer become periodic, resulting in a complex and subtle wood grain pattern that resembles natural wood. It was difficult to reproduce the changes.

The present invention has been made to solve the above-mentioned problems. Raw material veneers with unevenness formed on both sides are laminated and pressed between a pair of templates using an adhesive to form a frit. In the manufacturing method of artificial wood grain decorative veneer, in which the adhesive layer of the fritsch is peeled off to form a wood grain pattern, common veneers are used as the raw material veneer, and the circumferential speed is the same, but the ratio of the circumferential lengths is a prime number. The present invention relates to a method for producing an artificial wood grain decorative veneer, characterized in that the veneer is passed between a set of two rotating embossing rolls to simultaneously form unevenness on its bare back surface.

That is, the raw material veneer used in the method of the present invention is made to pass between a pair of rotating embossing rolls that have the same circumferential speed but a prime number ratio of circumferential lengths. If the circumference of the book roll 2 is a, the circumference of the other roll 3 is b, and the ratio of a:b is a prime number, for example a:b=5:3, then the veneer 1
As shown in FIG. 1, the period at which concavities and convexities of the same shape appear simultaneously on the front and back surfaces of the roll 2 is after the roll 2 has rotated three times. A prime number is a natural number other than 1 that has no divisors between itself and 1. However, when the circumference ratio of the embossing rolls 2 and 3 is an integer, for example, a:
If b=4:2, the same shape of unevenness will appear on the front and back surfaces of the veneer 1 every time the roll 2 rotates once, as shown in FIG. 2, and the complexity will be drastically reduced. Therefore, if the ratio of the circumferences of two rolls with different circumferences is set to a large prime number ratio, such as 41:37, 31:29, or 53:49, there will be no chance that unevenness of the same shape will appear on the front and back surfaces of the veneer at the same time. It is possible to obtain a raw material veneer with a wide variety of materials. It goes without saying that by increasing the number of embossing rolls, a raw material veneer having even more varied uneven shapes on the front and back surfaces can be obtained.

As described above, when artificial wood grain decorative veneers are manufactured using raw material veneers with unevenness formed on the front and back surfaces of the veneers by the method of the present invention, the adhesive layer that adheres the raw material veneers changes complexly and delicately. Therefore, the wood grain pattern expressed thereby also has complex and subtle changes similar to natural wood, and an artificial wood grain decorative veneer having natural wood grain pattern changes can be obtained.

Examples of the present invention will be described below.

Example 1 Among 500 veneers dyed rose color with a thickness of 0.6 mm
400 sheets with irregular uneven shapes on the surface, a prime number with a circumference ratio of 31:29, and rotating at the same circumferential speed,
An uneven shape was imparted to the front and back surfaces by passing between the lower pair of embossing rolls. Next, about 4 veneers with uneven shapes on the front and back sides and about 1 flat veneer were combined together using an amino resin adhesive colored blackish brown (approximately 150 g/m ² coating amount) for a total of 500 g/m 2 . The sheets were laminated and pressed between a pair of flat templates at a pressure of 20 kg/cm ² for about 6 hours to form a frit.

Then, the adhesive layer of the fritsch was peeled to a thickness of 0.4 mm using a slicer so that it had a wood grain pattern, thereby obtaining a rose pattern artificial wood grain decorative veneer having the desired natural straight grain pattern variation.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing how unevenness is formed on the front and back surfaces of a veneer by the method of the present invention. Figure 2 is an explanatory diagram showing the case where the circumferential length ratio of the embossing roll is an integer, 1
... Commonly used veneer, 2, 3 ... Opposing embossing rolls with different circumferential length ratios.

Claims (1)

[Scope of Claims] 1 Raw material veneers with unevenness formed on both sides through adhesive are laminated and pressed between a pair of templates to form a fritchi, so that the adhesive layer of the fritchi has a wood grain pattern. In the manufacturing method of artificial wood-grain decorative veneer, which involves stripping a regular veneer as a raw material veneer, the circumferential speed is the same, but the ratio of the circumferential lengths is a prime number. A method for manufacturing an artificial wood-grain decorative veneer, characterized by using a veneer that has been passed through and has unevenness formed on the front and back surfaces at the same time.