JPS5962102A - Manufacture of 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] This invention relates to a method for manufacturing decorative veneers.

A laminated flitch is obtained by laminating and press-bonding multiple pieces of veneer material using an adhesive, and the laminated flitch is sliced from a predetermined direction that intersects with the laminated surface, and the cut surface of each veneer material is made into natural wood. In order to obtain a decorative veneer that expresses the annual ring layers that can be seen, one method is to use each of the above-mentioned materials to express summer wood similar to coniferous trees such as cedar, pine, and cypress in the reproduced wood grain pattern. A fibrous sheet such as paper or non-woven fabric colored in the color of the summer wood was glued onto the surface of the veneer (for the spring wood).

However, if the fibers themselves are colored in advance or used as a fibrous sheet, the light resistance will be poor, and if the sheet is colored by post-processing, the cost will increase. In addition, the summer wood found in natural tree species has a color concentration gradient as shown in Figure 1, and the color transition from summer wood to spring wood is continuous in one annual ring. On the other hand, when using a fibrous sheet that is entirely colored in the same color, the boundary between the summer wood part (fibrous sheet layer) and the spring wood part (material veneer) becomes clear, as shown in Figure 2. There was a problem that the concentration gradient of

Therefore, an object of the present invention is to be able to express a wood grain pattern that has a color density gradient similar to that seen in natural wood and in which the transition from summer wood to spring wood changes continuously. An object of the present invention is to provide a method for manufacturing a decorative veneer that can reduce costs.

An embodiment of this invention will be described based on FIGS. 3 and 4. That is, as shown in FIG. 3 (Al or G), this decorative veneer manufacturing method involves coating a raw material veneer 1 dyed in the spring wood color with adhesive colored in the summer wood color using a roll coater 2. Apply adhesive 3 (Fig. (2) and width)), and then overlay the fibrous sheet 4, one side 5 of which has been colored in the dark summer wood color with 14, on the surface coated with adhesive 3, and press and tighten. A composite veneer 6 is obtained by gluing ((0 and a) in the same figure), several pieces of this composite veneer 6 are laminated with an adhesive, and pressed and bonded with a concave-convex die 7 to obtain the composite veneer 6. The decorative veneer 9 is obtained by slicing the flitch 8 (FIGS. 2A and 3B).

In this way, since the fiber W rate 4 and the material veneer 1 are pressed and bonded together using the adhesive 3 colored in the color of the summer material, the adhesive 3 is applied to the fibrous sheet 4 during pressing. Penetrates both the fabricated material veneer 1, the fibrous sheet 4 and the material veneer 1.
As a result, the transition from the summer wood area 10 to the spring wood area 11 appears as a continuous color change, as shown in FIG. In particular, by forming a dark summer wood color on one side 5 of the fibrous sheet 4, as shown in Figure 4, a color density gradient similar to that of natural wood is created, giving it a natural feel that closely resembles natural wood grain. A decorative veneer 9 is obtained. Furthermore, since the entire fibrous sheet 4 is colored by the penetration of the colored adhesive 3 when bonded to the material veneer 1, the coloring step can be omitted, and costs can be reduced.

As the fibrous sheet 4, for example, paper, nonwoven fabric, etc. can be used.

Next, a case will be described in which a decorative veneer having a wood grain pattern similar to natural pine is manufactured based on this example.

First, one side of kraft paper with a thickness of 0.5 am was colored with the dark summer wood color of pine for gravure printing. On the other hand, use Shina rotary veneer as the material veneer, and after coloring this veneer in the spring wood color of pine, apply 120 to 130 g of adhesive mixed with ferric oxide pigment to create the pine wood color. Apply with
The above-mentioned kraft paper was superimposed on the top surface and pressed, and the adhesive was cured to obtain a laminated veneer. In step b, a plurality of laminated veneers were laminated on a mold using an uncolored adhesive, pressed and adhered to obtain an assembled flitch, which was then sliced. As a result, a decorative veneer with a 4A wood grain pattern that closely resembles natural pine was obtained.

As described above, the method for producing a decorative veneer of the present invention is to process a fibrous sheet whose one side is colored in the dark summer wood color by applying the coloring υ'
Place the pieces on a veneer of material dyed in the spring wood color with the IJ facing up, and press and adhere them together using an adhesive colored in the summer wood color to obtain a bonded veneer. Next, several sheets of this composite veneer glue are laminated and pressed and pressed at mV to obtain a fringe. By slicing this, it has a daily concentration gradient similar to that found in natural wood, and it can be separated from the summer wood to the spring wood. It is possible to express a wood grain pattern in which the transition from part to part changes continuously, and it is also effective in reducing costs.

Next, a method for manufacturing decorative veneer that allows the thickness of the wood grain to be adjusted as desired will be explained.

Since the natural E1 pattern usually consists of various wood grains with different thicknesses, in order to express this on the surface of the decorative veneer, fibrous sheets (hereinafter referred to as paper is representative) of different thicknesses are used. As shown in FIG. 5i
f1!3 A composite veneer 15 in which the paper is impregnated with the adhesive is obtained by bonding and press-fitting using the adhesive I3, which are randomly assembled and laminated, and press-fitted Yt1. The assembled flitch was obtained by slicing it to obtain a decorative veneer 16 whose grain thickness varied depending on the thickness of the combined paper 14 as shown in FIG. That is, the thick wood grain 17a is represented by thick paper, and the thin wood grain 17b is represented by thin paper.

However, this method requires managing the thickness of the paper 14 and adjusting the amount of adhesive 13 applied for each thickness of the paper 14, making it extremely complicated and inefficient.

Therefore, by keeping the thickness of the paper used and the amount of adhesive applied constant, and changing the moisture content of each material veneer, we were able to create a decorative veneer that expresses the grain thickness of each veneer on the board surface. I was able to get it in place. That is, as shown in FIG. 7c~, the adhesive does not penetrate into the material veneer 18a with a high moisture content and the wood grain becomes thinner, whereas the material veneer with a low moisture content holding the paper 19 in between becomes thinner. In 18b, more adhesive penetrates into the wood, making the wood grain thicker.

The degree of penetration of the adhesive varies depending on not only the moisture content of the veneers 18a and 18b but also the type of adhesive used, especially the viscosity. As the adhesive, any liquid adhesive (for example, urethane resin, epoxy resin, urea resin, urea melamine resin, etc.) that has been conventionally used in the production of decorative veneers can be used.

A test example will be given and explained below.

Test example 1: Degreasing agathis veneer with a thickness of l and Q*m.

It was dyed by bleaching and staining. 8 mils paper was bonded to this using a two-component poxy adhesive, and the sheets were then combined using a flat plate press.
Pressed using M epoxy adhesive.

I glued them together and created a flitch. Next, this flitch was sliced at a slicing angle of 20° to obtain a decorative veneer of 035, and the thickness of the wood grain relative to the moisture content of the material veneer was examined.

The results are shown in the first bale.

Table 1 Other conditions for obtaining composite veneers are as follows.

Adhesive application amount: 80-150g Clamping pressure: 5-20kg/cd Clamping time: 30-120 minutes Within these ranges, no significant difference in grain thickness was observed.
Similarly, there was no significant difference when comparing the production areas of the veneer material.

Test example 2: The moisture content of the material veneer was set to 80%, 50% and 3
Composite veneers were obtained from each material veneer in the same manner as in Test Example 1, and the composite veneers were combined, laminated, and pressed together to create a flitch. When this flitch was sliced in the same manner as in Test Example 1, it was possible to obtain a decorative veneer that closely resembled a natural board and had a glazed grain thickness.

Another method of obtaining decorative veneers having various grain thicknesses will be explained. That is, in this method, a polyurethane adhesive is used as an adhesive, the thickness of the paper is kept constant, and the moisture content of the veneer is varied to obtain a composite veneer.

The polyurethane adhesive reacts with the water contained in the material veneer, generates 002 gas during curing, and forms a foam layer around the wood grain. Therefore, when using a veneer made of a material with a high moisture content, a thick foam layer will be formed around the wood grain, Figure 8 (8).
As shown in the figure, the paper layer 21 inside the car plate 2 and the inside of the car 20 is shown.
(the wood grain portion) is hidden by the foam layer 221, and only the thin wood grain portion is visible on the surface. 7 against dough
When a veneer of material with a low moisture content is used, foaming occurs only slightly, so that almost the entire inclined paper layer 21' can be seen through from above, and the wood grain can be made thicker and larger.

A test example will be given and explained below.

Test Example 3: A decorative veneer was obtained in the same manner as Test Example 1, except that a polyurethane adhesive was used instead of the two-component epoxy adhesive, and the wood grain thickness relative to the water content of the material veneer was examined. The results are shown in Table 2.

Table 2 Adhesive amount and pressing pressure to obtain composite veneer.

Both the pressing time and the origin of the veneer were conducted under the same conditions as in Test Example 1, but no significant differences were observed in either case.

[Brief explanation of drawings]

Fig. 1 is a graph showing the color density gradient in natural wood, Fig. 2 is a graph showing the color density gradient in conventional decorative veneer, and Figs. 3 (A) to 0 show an embodiment of the present invention. Process explanatory diagram, Fig. 4 #i Graph showing the color density gradient of the obtained decorative veneer, Fig. 5 (A) and (81) show the conventional compounding process for obtaining various wood grain thicknesses. Fig. 6 is a plan view showing decorative veneers having various grain thicknesses, Figs. FIGS. 8(A) and 8) are explanations showing similar wood grain thicknesses changed by other methods [g+]. 1... Material veneer, 3... Adhesive, 4... Fibrous sheet 26... Composite veneer, 8... Flitch, 9... Decorative veneer (A) Figure 8 (B) )

Claims (1)

[Claims] 11. Place a fibrous sheet with one side colored in the dark summer wood color so that the colored side is facing up. The composite veneers are then layered on top of a material veneer dyed in the color of spring wood, and then pressed and bonded together using an adhesive colored in the color of summer wood to obtain a composite veneer. A method for manufacturing a decorative veneer, characterized by laminating, pressing and gluing to obtain a flitch, and slicing the flitch.