JPS5850564B2 - Manufacturing method of artificial decorative veneer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing artificially decorated veneers.

A plurality of veneers of the material coated with adhesive are laminated, and this is pressed and bonded with a concave-convex mold to obtain a concave-convex deformed flitch, and this deformed flitch is sliced from a predetermined direction to laminate the veneers of each material. In a method for manufacturing artificially decorated veneers that expresses a wood grain pattern on the wood surface whose boundary surfaces are modeled on tree-ring lines, a method for producing artificially decorated veneers in which uneven localized areas of the material veneers to be laminated are formed during the pressure bonding process using the uneven mold is applied. In comparison, greater pressure is applied to the periphery or edges, so adhesion starts at the periphery or edges first, and the carbon dioxide gas generated as the adhesive solidifies is not dissipated in the center, resulting in a flitch. had the disadvantage that poor adhesion was concentrated in the central region where the uneven localized areas were formed.

This phenomenon in which the clamping pressure is unevenly distributed on the laminated material veneer is caused by the fact that the curvatures of the opposing convex and concave surfaces of the concave and convex mold that presses the laminated material veneer are usually the same, and uneven localized areas are formed. In the central part of the laminated material veneer, the thickness direction, that is, the normal direction, of the laminated material veneer almost coincides with the pressing direction of the uneven mold, whereas in the peripheral part or the edge, the normal direction is different from the pressing direction. This is thought to be due to the fact that the thickness measured in the clamping direction becomes larger at the periphery or at the ends than at the center.

From this, it can be considered that as the number of laminated veneers increases, the uneven distribution of the clamping pressure becomes more pronounced.

From the above, one method for preventing the above-mentioned adhesion failure is to make the curvatures of the convex and concave surfaces different so that the distance between the opposing convex and concave surfaces of the concave-convex mold is wider at the periphery than at the center. A method is possible in which the laminated material veneer is pressed and bonded in an uneven manner so that the pressing pressure is evenly applied to the center and peripheral parts of the laminated material veneer.

That is, one embodiment of this method includes, as shown in FIG. 1A, an upper mold 1 having a concave surface in contact with the laminated material veneer, and a lower mold 2 having a convex surface in contact with the laminated material veneer. In the pressure adhesion process of a laminated material veneer using a concave-convex die 3 consisting of a combination of As shown in Fig. 2A, first, temporary pressure is applied, and after this temporary pressure is applied uniformly over the entire surface of the material veneer 4, sufficient adhesion is achieved without any defective bonding parts. The mold 2 is replaced with a lower mold 2 having a convex surface having the same curvature as the concave surface of the upper mold 1 as shown in FIG. If the number of laminated material veneers 4 is further increased, as shown in Figure C, a new material veneer 4 is laminated with the already formed flitch 5 on the upper side via adhesive, and then the above-mentioned pressure is applied. Repeat the process.

Further, in another embodiment of this method, as shown in FIG. 3, contrary to the above embodiment, as shown in FIG. 1' is used to first perform temporary pressing, and in the final pressing, as shown in FIG. If the number of laminated material veneers is to be further increased, as shown in FIG.
are laminated and the above-mentioned pressing step is repeated.

In each of the above embodiments, as shown in FIGS. 1 and 3, upper molds 1, 1', lower molds 2. If the height from the horizontal plane P at the center of the curved surface of z is h, then the upper molds 1, 1/or the lower molds 2, 2' used differently between temporary pressing and main pressing. The difference Jh in the above dimensions and h is determined when the angles θ and f formed by the contact surfaces t of both ends of the curved surfaces of the upper molds 1, 1' or the lower molds 2, 2' and the horizontal plane P are about 10 to 15 degrees. In the case where 50 veneers of material with a thickness of 1.0 itiI are laminated and pressed to form an uneven shape, it has been confirmed that about 1.8 sm is appropriate.

Note that the angle θ of the upper mold 1, 1' and the lower mold 2, 2'.

The optimum value of the difference Jh in the height dimension h' between the preliminary pressing and the main pressing in each case is as shown below.

Further, other pressing conditions in each of the examples are as shown below.

Adhesive/Nismitac A-601 (manufactured by Sumitomo Chemical Co., Ltd.) Coating amount = 100±20, j9/m'' Pressure Pressure Crab Temporary press 5±1/cr/L Final press ~10
±1 kg/cvi Clamping time: Preliminary pressing - 30 minutes or more Main pressing - 20 minutes or more, so use upper or lower molds with curved surfaces with different curvatures for preliminary pressing and main pressing. As a result, the clamping pressure applied to the entire surface of the laminated material veneer 4 during flitching becomes uniform, and therefore poor adhesion of the material veneer 4 can be prevented.

However, as is clear from the above explanation, the uneven distribution of clamping pressure between the central and peripheral parts of the material veneer 4 in the deformed flitching process using the uneven mold 3 is proportional to the laminated thickness of the material veneer 4. Therefore, if you want to obtain many types of flitches with different lamination thicknesses by the above method, once you have obtained the flitch 5 with a predetermined number of material veneers 4 as described above, you will need to perform the same flitch forming process as above. The number of material veneers 4 and the formed flitch 5 are laminated together and the same pressing process is repeated, or depending on the thickness of the flitch to be obtained, preliminary pressing and main pressing are performed. The curve change ratio of the curved surfaces of the upper molds 1, 1' and the lower molds 2, 7, which are used separately for tightening, must be determined separately, and the former method of repeating the pressing process makes the work of the flitching process troublesome. However, in the latter method of preparing an upper mold 1' and a lower mold 2' with different curvatures of the curved surfaces depending on the laminated thickness of the material veneer 4, it is necessary to prepare a large number of uneven molds 3, which increases the manufacturing cost. In addition, the concavo-convex mold 3 must be replaced each time depending on the desired flitch thickness, which is a troublesome operation.

Therefore, it is an object of the present invention to form a material veneer on the uneven localized portion in an extremely easy operation without requiring many types of uneven molds in the formation of an uneven deformed flitch even under the above-mentioned pressing conditions. To provide a method for manufacturing an artificial decorative veneer, which can prevent adhesion failures from concentrating on the surface and achieve good adhesion uniformly over the entire surface.

An embodiment of this invention is shown in FIG.

That is, in this method of manufacturing artificial decorative veneers, material veneers are laminated with an adhesive, an upper mold 1 whose contact surface to the laminated material veneer 4 forms a concave curved surface, and a convex part having the same curvature as the concave curved surface. In the step of forming a concave-convex deformed flitch by press-bonding with a concave-convex die 3 configured in combination with a lower die 2 having a curved surface, the gap between the contact surface of the upper die 1 and the material veneer 4 (Fig. A), or between the contacting surface of the lower mold 2 and the raw material veneer 4 (FIG. 5B), the surface that is in close contact with the contacting surface of the upper mold 1 or the lower mold 2 and facing the material veneer 4 side is upward. An auxiliary mold plate 6 having a curved surface different from the curvature of the contact surface of the mold 1 or the lower mold 2 and having a crescent-shaped cross section, the center part of which is slightly thicker than the peripheral part, is interposed and temporarily pressed, and then the auxiliary mold plate is 6
is removed, and as shown in FIG. 5C, final pressing is performed using only the upper die 1 and the lower die 2 to obtain a concavo-convex deformed flitch.

In the embodiment described above, the uneven mold 3 has a width of 700 mm.

The angle θ between the end tangent t of the tangent surface and the horizontal plane P is 10 to 15
Glue: SumiTac A-601 (manufactured by Sumitomo Chemical Co., Ltd.), coating amount ioo±20.
Lamination, pressing, and adhesion are carried out through the pressure of Jj/m', and the pressing conditions are pressure crab temporary pressing ~ 8 ± 1 kg / Sawamoto pressing ~ 12 ± 1 kg / cy7i Pressing time: Temporary pressure Tighten for 0.5 to 5 minutes, and final tighten for 30 minutes.

Moreover, the thickness of the central part of the auxiliary template 6 at this time is L.
8mz width 200mm and materials are rubber, polypropylene,
Formed from polyethylene or wood.

In this way, uneven distribution of the clamping pressure during pressure adhesion of the laminated material veneer 4 by the uneven mold 3 can be prevented by interposing the auxiliary template 6 between the contact surface of the uneven mold 3 and the material veneer 4. Therefore, as in the case of the above-mentioned flitching process shown in Figures 1 to 4, the pressing process is repeated several times depending on the difference in the number of stacked material veneers to be pressed and bonded. There is no work involved, there is no uneconomical need to prepare the uneven mold 3 for each number of laminated sheets, and there is no need for the accompanying work of replacing the uneven mold 3. Since it is sufficient to prepare several types of auxiliary templates 6 and replace them as appropriate, the manufacturing cost is reduced and the work is extremely simple.

As described above, the method for manufacturing artificially decorated veneer of this invention is as follows:
When press-bonding the laminated material veneer, an auxiliary template is interposed between the uneven mold and the laminated material veneer, which closely contacts the uneven mold and forms a contact surface of the material veneer with a different curvature from the uneven mold contact surface. Because of this, it is possible to achieve good adhesion over the entire surface of the laminated material veneer without complicating the work in the flitching process or preparing a large number of uneven molds.

[Brief explanation of drawings]

Fig. 1 is a side view showing a concavo-convex mold used in an embodiment of the prior art that is the basis of this invention, Fig. 2 is an explanatory diagram of the flitch processing process of that embodiment, and Fig. 3 is another embodiment of the prior art. FIG. 4 is a side view showing a concavo-convex mold used in the example, FIG. 4 is an explanatory diagram of the manufacturing process of the embodiment, and FIG. 5 is an explanatory diagram of the flitch processing process of one embodiment of the present invention. 1.1'...upper mold, 2,2'...lower mold, 3...uneven mold, 4...material veneer, 5...flitch, 6...
Auxiliary template.

Claims (1)

[Claims] 1. In a method for manufacturing an artificial decorative veneer, in which material veneers are laminated with an adhesive and pressed together with a concave-convex mold to form a concave-convex deformed flitch, and this flitch is sliced, during the pressure bonding, the concave-convex mold and the laminated A method for manufacturing an artificial decorative veneer, characterized by interposing an auxiliary template between the material veneer and the material veneer, which closely fits the uneven pattern and forms a material veneer contact surface having a different curvature from the uneven surface.