JPS6246323B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing laminated wood such as decorative veneer.

Until now, natural precious wood veneers have been used as veneers for decorative plywood and the like. however,
The raw wood for natural precious wood veneer is gradually decreasing, and the yield when manufacturing natural precious wood veneer with a beautiful grain pattern from raw wood is extremely low, so the price of natural precious wood veneer has become extremely high. Therefore, we thought of producing a decorative veneer with a grain pattern similar to that of natural precious wood veneer using low-cost resin paper instead of using natural precious wood. The method for producing such a decorative veneer is as follows. That is, bleached, semi-bleached, or unbleached kraft paper, etc. is dipped in a dye solution and dyed to a predetermined color (the color of the target spring wood or summer wood of the natural precious wood veneer).
By impregnating this with synthetic resin liquid and drying it, spring wood color dyed resin paper and summer wood color dyed resin paper are made, and adhesive is applied to these to create spring wood color dyed resin paper and summer wood color dyed resin paper. By stacking paper and paper alternately, sandwiching and pressing them between a pair of molds to form fritches, and slicing them, decorative veneers that look like natural precious wood veneers were manufactured. However, when manufacturing decorative veneers in this way, the dyed resin paper is thin, so when applying adhesive to it using a roll coater, for example, the resin paper may wrap around the roll coater. It has been difficult to apply the adhesive, making it difficult to manufacture decorative veneers. In addition, because dyed resin paper is thin, it is difficult to handle during transportation, and it is also difficult to incorporate into automated processes.

This invention was made in view of the above circumstances, and is a method for producing laminated wood by frit-forming a laminate made of resin paper and a veneer of material as a thin sheet-like material, and slicing it. The gist of the sheet-shaped resin paper is to use it in the form of a bonded body that is previously bonded to a raw material veneer to produce a laminated wood such as a decorative veneer.

Next, this invention will be explained in detail.

This invention is for manufacturing a decorative veneer using a bonded body of resin paper and material veneer.

Resin paper is made of paper with a thickness of several tens of mils to several mils, especially kraft paper or linter paper that is easily penetrated by synthetic resin liquid, and synthetic resin such as urea, melamine, urea-melamine, phenol, polyvinyl alcohol, etc. A varnish dissolved in an organic solvent is impregnated and dried. It is preferable to use a varnish having a solid content concentration of 10 to 80% by weight (hereinafter abbreviated as "%"), preferably 20 to 60%. This resin paper is
Usually, the color is set to be the same as the color of the summer wood of the target natural tree. If you want to have such a color, you can use paper that contains a colorant as the raw material for resin paper, or use paper that has been colored with a colorant liquid such as dye liquid, and then impregnate it with varnish, or add it to the varnish. This is done by impregnating uncolored raw paper with a coloring agent. And the moisture content of resin paper (moisture content =
(Water weight - dry weight) / (dry weight) x 100) is
It is preferable to set it to 40 to 100% from the viewpoint of slicing performance of the slit in the subsequent process.

The material veneer to be laminated with the above resin paper is usually a raw wood veneer cut from low-priced raw wood, a bleached veneer or raw wood veneer, or a colored veneer made from a bleached veneer. .
Furthermore, plywood made by laminating a plurality of these veneers together may also be used. Such material veneer is usually set to have the same color as the spring wood portion of the targeted natural wood. The moisture content is preferably set at 40 to 100%, similar to resin paper.

Laminating resin paper and material veneer,
After applying adhesive to the surface of the veneer, resin paper is placed on top of it and pressure is applied. In other words, since the material veneer is strong, it does not get wrapped around a roll coater or the like when applying adhesive. After layering the resin paper on top of the material veneer, pressure can be applied at room temperature, covered with a sheet and heated, or heated with a hot roll in a hot steam atmosphere. This is done by applying pressure. According to the present invention, when bonding resin paper and a material veneer, adhesive is applied only to the material veneer and not to the resin paper. No problems arise during application. By laminating the resin paper 1 and the material veneer 2 together as shown in Fig. 1 in this way, a paste having one set of summer material part (resin paper part) and spring material part (material veneer part) is bonded together. A fitted body 3 is obtained. In this case, if a material veneer scrap material 2a is used instead of the raw material veneer 2 and it is pasted on the resin paper 1 in a horizontal splice state as shown in Fig. 2, the scrap material 2a can be used effectively. can be achieved.

Using a plurality of adhesive bodies 3 thus obtained, they are laminated with adhesive in the usual manner, pressed with a pair of templates to form fritches, and then sliced to create a decorative veneer (Fig. (not shown) is obtained. In this case, the resin paper 1 constituting each adhesive body 3
If the moisture content of the raw material veneer 2 is set to 40 to 100%, slicing can be easily performed.

In addition, when slicing, if the slice thickness is reduced, a decorative veneer laminated wood with a natural precious wood veneer look that can be used for decorative plywood is obtained, and if it is thickened, a plate-like laminated wood with a wood grain pattern is obtained. This will make it possible to obtain materials. Furthermore, instead of constructing the frit only with the adhesive body 3, it is also possible to construct the frit using the adhesive body 3 and a normal material veneer, and then slice this to produce laminated wood. be.

As described above, since the present invention uses a strong adhesive body in which a sheet-like resin paper and a veneer of material are adhered, it is easy to apply an adhesive when laminating and bonding these together. That is, unlike when resin paper is used alone, it does not wrap around the roll coater. Moreover, since this adhesive body is quite thick, it is easy to handle during transportation and easy to put into an automated process.
Further, setting the moisture content of the adhesive body to 40 to 100% has the effect that slicing of the fritches is extremely easy and the occurrence of cracks during handling is avoided.

Next, examples will be described.

Example 1 Multiple sheets of kraft paper (thickness 254μ (10 mils),
Sanyo Kokusaku Pulp Co., Ltd., HL-10) was impregnated with a varnish colored with a water-soluble dye by adding 0.8 parts by weight of an ammonium chloride curing agent to 100 parts by weight of an aqueous urea-melamine resin liquid (25% solids), and then 130℃
It was dried to create resin paper with a moisture content of 60%. The resin content of this product was 43%.

On the other hand, a labra-dyed veneer (rose color) with dimensions of 1800 x 300 x 1 mm was dried and the moisture content was adjusted to 70%.

Next, a moisture-curable one-component urethane adhesive was applied to each of these Labra-dyed veneers, and then the resin paper described above was layered and pressed at room temperature to produce a bonded body. In this way the total
300 adhesive sheets were made, each coated with the above urethane adhesive and stacked with the resin paper facing in the same direction. Next, this was sandwiched and pressed between a pair of templates with uneven pressing surfaces to create fritches, and this was sliced to produce decorative veneers. In this case, since the adhesive body was strong and thick, it was easy to apply the adhesive and handle it. Furthermore, since the moisture content of the adhesive body was set appropriately, no blemishes or cracks occurred during slicing. The obtained decorative veneer had a smooth surface, a wide summer wood part, and a natural appearance.

Example 2 Dimensions are 1800 x 100 x 1 mm and 1800 x 50 x 1 mm
Using scraps of Labra-dyed veneer, this was pasted onto resin paper made in the same manner as in Example 1 to make a fixed-sized (1800 x 300) adhered body. Also, as in Example 1, the dimensions are 1800 x 300
A 1 mm Labra dyed veneer was used and bonded to a resin paper made in the same manner as in Example 1 to make a regular-sized adhesive. Decorative veneers were manufactured in the same manner as in Example 1 using the two types of adhesive bodies thus obtained. The obtained decorative veneer was superior in that the horizontal joints of the Labra-dyed veneer scraps were not noticeable, and it was inexpensive because scraps were used.

[Brief explanation of the drawing]

FIG. 1 and FIG. 2 are explanatory diagrams for manufacturing the adhesive body used in the present invention, respectively. 1...Resin paper, 2...Material veneer.

Claims (1)

[Claims] 1. A method of manufacturing laminated wood by frit-forming and slicing a laminate made of resin paper and a material veneer as a thin sheet-like material, wherein the sheet-like resin paper is bonded to the material veneer in advance. A method for producing laminated wood, characterized in that it is used in the form of a bonded body.