JPS58155902A - 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.

Laminating and pressing multiple veneers using adhesive *tt,
, a laminated flitch is obtained, and this laminated flitch is sliced from a predetermined direction intersecting the laminated surface thereof to obtain a laminated decorative veneer having a wood grain pattern on the material surface that imitates the cut surface of each material veneer as an annual ring layer. In the production of decorative veneers, various methods have been developed to express ring-hole materials having some holes in some of the annual rings, such as zelkova and nara.

@As an example of a method for producing a decorative veneer that can express well some of the holes in a natural circular hole material, we have used a method of manufacturing a decorative veneer to express the holes of a tree with a controlled density of conduits, and a method of manufacturing a decorative veneer to express the holes of a tree with a controlled density of conduits, and a method of manufacturing a decorative veneer that can express a part of the holes of a natural ring hole material. Combine and stack the obtained spring wood parts with the wooden purchase cart to express the spring material, and make a 7-rich assembly →
Conventionally, a method of applying a slicing process has been used.

However, when this method is used, the concave-convex assembly 7
In the enrichment process, the pressing pressure is biased between the intermediate area and the side area of the uneven shape (the pressure in the intermediate area is weaker than the side area), which has the drawback that poor adhesion is likely to occur.

Therefore, an object of the present invention is to provide a method for manufacturing a decorative veneer that can produce a ring-hole material with a natural appearance without poor adhesion.

An embodiment of this invention is shown in FIG. That is,
This decorative veneer manufacturing method is to obtain a laminated decorative veneer in which a wood grain pattern with four holes is reproduced on the wood surface by the following steps.

(11 Wood veneer 1 for expressing part of the first hole, sliced from a tree species with a large conduit diameter and high conduit stiffness, and a high compressive modulus of elasticity, to a thickness of 0.6 to 1.5 cm. A 1g2 wood veneer 1' for expressing a part of the hole is sliced to the same thickness from a tree species with a large pipe diameter and high conduit density and a low compressive 0 modulus of elasticity, and is bleached and dyed to a predetermined color. Process (Picture 1 Prisoner).

(2) A plurality of n first wood veneers having a high compressive elastic modulus are concentrated in the middle layer, and a plurality of pre-iTa second wood veneers 1' having a small compressive elastic modulus are concentrated in the upper and lower layers, respectively. , the second wood veneer board layer, the first wood veneer layer, and the second wood veneer layer.
A plurality of sheets of flitch are laminated with # adhesive interposed therebetween and pressed and bonded using a flat mold 2 to obtain a flat flitch assembly 3 (FIG. 2(Bl)).

(The 311 flat assembly fritch 3 is sliced in the direction perpendicular to its laminated surface, and the laminated portion of the first wood veneer 1 is in the intermediate surface area. The laminated portion of the second wood veneer 1' is A composite veneer 4 is obtained in which the veneer is divided and exposed in a straight-grained manner on both sides (FIG. 1 (C1, (I)).

(No. 411 1. A wood veneer obtained by slicing a tree species different from the tree species from which 1' was obtained is dyed in a spring wood color to obtain a spring wood color dyed veneer 5. (Figure (E)).

(5) The composite veneer 4 and the 1IIR color-dyed veneer 5 are appropriately combined (for example, alternately), laminated with an adhesive, and pressed and bonded with a concave-convex mold 6 to form a concave-convex laminated flitch 7.
((F) in the same figure). At this time, the concave-convex die 6 is a lower die whose pressing surface is a convex curved surface. 9 both sides of the composite veneer 4 correspond to both sides of the composite veneer 4, respectively.

(6) A laminated decorative veneer in which the uneven laminated flitch 7 is sliced from a predetermined direction intersecting the laminated surface thereof, and a grain pattern is exposed on the cut surfaces of the composite veneer 4 and the spring wood color-dyed veneer 5. 8 (β in the same figure), (published).

In this way, the wood veneer 1 with a high compressive modulus of elasticity is unevenly distributed in the middle layer, and the wood veneer 1' with a low compressive modulus of elasticity is unevenly distributed in the upper and lower layers, and this is flitched from the direction perpendicular to the laminated plane. Since the composite veneer 4 for expressing the pore area is obtained by slicing, the compressive elastic modulus of the intermediate surface area of this composite veneer 4 is larger than that of both side surface areas, and the compression caused by the next uneven mold 6 is increased. In the tightening and bonding process, it is difficult to apply pressure to the middle part compared to both sides of the uneven mold 60, and adhesion failure tends to occur in the middle part. It can be corrected by intervention.

Furthermore, in the wood grain pattern to be reproduced, the perforated area 8a is expressed by the cut surface of the composite veneer 4, and the laminated decorative veneer 8 can be made to closely resemble natural ring-pored material.

As described above, the method for manufacturing a decorative veneer of the present invention comprises a plurality of first wood veneers having a high conduit density and a large compressive elastic modulus, and a second wood veneer having a high conduit density and a low compressive elastic modulus. are laminated with an adhesive into a three-layer structure consisting of a concentrated middle layer of the first wood veneer and a concentrated upper and lower layer of the second wood veneer, and are pressed and bonded to obtain a primary flitch. A forming step, and slicing the laminated fluff t from a predetermined direction intersecting the laminated surface thereof, so that the laminated part of the front tr3 first wood veneer is in the middle area, and the laminated part of the GTT second wood veneer is on both sides. A primary slicing process to obtain composite veneers that are divided into areas, and the composite veneer and the spring material veneer are combined and laminated and bonded using an uneven mold using an adhesive to form an uneven laminated flitch. This process includes a secondary assembly flitch forming process to obtain a flitch, and a secondary slicing process of slicing the uneven assembly 7-rich from a predetermined direction intersecting the laminated surface, thereby creating a ring-hole material with a natural feel without electrical defects. It has the effect of being able to.

As mentioned above, in the method for manufacturing decorative veneer in which a laminated decorative veneer is obtained through the process of laminated flitch-slicing,
Figure 2 shows a method for producing decorative veneers that can avoid such adhesion failures during force ζ flitching, which tends to cause adhesion failures due to uneven pressure distribution during pressure bonding due to uneven molding. Prison ~ (The method shown in Shun is aJ Noh.

(1) Cut seven pieces of Chig of any size from Aganas wood and decolorize them (2:1 with H20□1.5% solution).
After drying, dye in the next dyeing bath for 2.5 hours and dry.

(2) The decolorized and dyed chip is molded using a vinyl acetate adhesive (CH107) '&-, and the thickness gradually decreases from the middle part to both sides (in this example, the middle part thickness is 1.
0.5 Pressure at both ends 0.97 days) A rectangular shaped veneer 9 is obtained (Fig. 2).

(3) f! +9 1st generation single molded veneers! #! The flitches are laminated with a bonding agent interposed therebetween and pressed and bonded using a concave-convex mold 10 to obtain a concave-convex flitch 11 (FIG. 2(B)).

(4) The uneven laminated flitch 11 is sliced from a predetermined direction intersecting the laminated surface thereof to obtain a laminated decorative veneer 12 (FIGS. 3(C) and (D)).

In this way, when molded veneer 9, which is formed from chip 1 into a plate shape, is used as a laminated veneer for laminated flitching, the shape of the veneer can be changed to a shape where the middle part is thicker and both sides are thinner. In order to prevent adhesion failures caused by biased pressure distribution K in bottle flitching due to unevenness [10], the lamination material veneer obtained by slicing from logs is pressed by pressing. Unlike the conventional case of deforming the thickness or slicing it so that the deformation occurs, there is no inconvenience such as the deformation of the thickness returning to its original state due to a change in water content or the difficulty of imparting the deformation of the thickness.

In addition, since decolorization and dyeing can be performed at the chip stage, the process prevents harmful birds and can be effectively destained.

Furthermore, since chips are used as the material, the yield of the material is the same as above.

In the above-mentioned molded veneer, in addition to the thickness change in the width direction, the thickness is also changed in the longitudinal direction, so that the annual rings of the reproduced wood grain pattern are varied and oriented in the thickness direction of the veneer. It is possible to perform molding 41 & embedding by mixing a long piece of wood into the front e-chip and expressing a radial structure with this piece of wood, and it is also possible to make the wood grain pattern rich in naturalness.

As a veneer for lamination in the above-mentioned laminated flitching, a colored surface material made of paper, non-woven fabric, etc. for expressing the summer wood is adhered to the essential veneer for expressing the spring wood, and the III wood veneer and the colored surface are bonded together. A method of using a composite veneer with a two-layer structure of materials has also been known, but the rigidity of the composite veneer obtained in this case also increases as the adhesive hardens, and it is difficult to apply pressure bonding using a concave-convex mold. Therefore, there was a problem in that it was necessary to increase the clamping pressure or reduce the thickness of the veneer to prevent adhesion failure.

As a way to solve this kind of problem, see Figure 3)
The decorative veneer manufacturing method shown in the following is possible.

(1) 13 tons of kraft paper of 5 to 9 ml colored in summer wood color was adhered to one side of essence veneer 14 dyed in spring wood color using adhesive 15 (KU-7091), then heated and dried do. In this example, while the main car plate 14 is fed to the pressure roll 16 at a predetermined speed (2 to 4 m/min), the adhesive 15 is applied to one side by the roll coater 17.
The cloth-treated kraft paper 13 is synchronized with the MIJ wood purchasing rate board 14 and fed to the Tsukini pressure roll 16, and the wood veneer 14 and the kraft paper 13 are polymerized and bonded by the pressure roll 16. The composite veneer 18 is taken out, and the taken out composite veneer 18 is continuously heated and dried (60
~80℃) (1!3 figures).

(21 Curl due to the difference in drying shrinkage rate between kraft paper 13 and essential veneer 14 (kraft paper 1311 becomes a convex curved surface)
A plurality of composite veneers 18 are aligned so that the convex curved surface faces the concave curved surface and are laminated with an adhesive, and the convex and convex molds 19 are used to press and bond the composite veneers 18 to obtain the concave and convex fringe 20. Figure (B)).

(3) The resulting concave-convex flitch 20t-1 is sliced from a predetermined direction intersecting the laminated surface thereof, and the cut surfaces of the 4i board 14 and the kraft paper 13 have a wood grain pattern that alternates in a board shape. Obtain laminated decorative veneer 21 (same figure +C
I, (b).

In this way, by heating and drying the composite veneer 18 before the curing of the adhesive, that is, before the adhesive hardens, the composite veneer can be 18 curls to form a shape that easily fits into the uneven mold 19, making it easier to apply pressing pressure uniformly and preventing contact failure and occurrence during assembly and flitching. In this case, it is desirable to use a thermosetting adhesive as the adhesive so that contact WM curing is performed as the adhesive is curled.

In addition to the above-mentioned kraft paper 13, nonwoven fabrics (1
2~a e t/rr? ) may be used.

[Brief explanation of the drawing]

FIG.
Figures 2 (3) to (■) are process explanatory diagrams showing an example of the method for manufacturing decorative veneers, and Figures 3 (N to (I) are process explanatory diagrams showing other examples of the method for manufacturing decorative veneers. 1... Wood veneer (1st), 1'... Wood veneer (@2
), 2...Flat type, 3...Flat assembly flitch, 4
... Composite veneer, 5... Spring wood color dyed veneer, 6... Concave and convex type, 7... Concave and convex laminated flitch, 8... Laminated decorative veneer, 8a... Four holes (G ) (G)) Figure 1 (A) (8) Urn fi ¥ 2 Figure Figure 3

Claims (1)

[Claims] A plurality of first wooden veneers with high conduit density and high compressive elastic modulus and a plurality of second wooden veneers with high conduit yellowness and low compressive elastic modulus are combined with a shielding agent to form the first wooden veneer. A first laminated flitch forming step in which a three-layer structure is obtained by laminating and pressing and adhering a three-layer structure consisting of an intermediate layer where the wood veneers are concentrated and the upper and lower layers where the second wood veneers are concentrated, and a first laminated flitch forming process in which the flitch is formed on the laminated surface thereof. A first step of slicing from a predetermined intersecting direction to obtain a composite veneer in which the laminated portion of the first wood veneer is separately displayed in the intermediate surface area, and the laminated portion of the second wooden veneer plate is separately displayed in both side surface areas. In the slicing process, the composite veneer and spring material veneer are combined and laminated, and pressed using a concave-convex mold using a bonding agent! i! 2nd J1 to get a normal and uneven beam formation flitch! A method for producing a decorative veneer, comprising a step of forming a flitch, and a secondary slicing step of slicing the uneven flitch as described above from a predetermined direction intersecting the laminated surface thereof.