JPS60115428A - Internal bending method - Google Patents

Abstract

PURPOSE:To perform an internal bending by post forming at a high efficiency with various curvatures by a method wherein a corner material similar to a desired shape of bending at a corner of a substrate and a normal-temperature hardening type highly viscous synthetic resin is applied on the surface thereof to get a thermosetting resin decorative board stuck thereon. CONSTITUTION:When a thermosetting resin decorative board is bent by post forming and stuck on a substrate, corner materials 2 similar to a desired bending shape are mounted at both ends of the substrate 1 and additionally, an injection port 5 is bored. Then, a normal-temperature hardening type highly viscous synthetic resin 4 is applied on the surfaces of the corner materials 2 to get the thermosetting resin decorative board 3 and an internal bending is done to fill the clearance between the corner materials 2 and the substrate 1 with the highly viscous synthetic resin 4 of the corner materials 2. Thus, a product is obtained sealed at both ends thereof simultaneously with the bending work.

Description

[Detailed Description of the Invention] The present invention provides a thermosetting resin decorative board (hereinafter referred to as a decorative board).
This invention relates to an internal bending method.

Post-form processing of decorative boards involves bending them along the curved surface of the board. In the case of outward bending, it is possible to crimp along the curved surface in the order of ■, @, θ and the ends as shown in Fig. 1, but in the case of inward bending, ■θ contacts first as shown in Fig. 2. However, crimping @ requires a lot of pressure,
Pressure cracks are likely to occur due to pendent pressure rolls, curling of the substrate, etc., and adhesion failure on curved surfaces is likely to occur. In post-form processing, the decorative board is heated to a high temperature and pressed onto the board at the same time as the bending process, but in the case of inward bending, the decorative board shrinks when cooled, causing it to move away from the curved surface as shown in Figure 3. Stress acts and promotes poor adhesion on curved surfaces. Since adhesion failure is likely to occur in this way, precision is required to process curved surfaces, and it is particularly difficult to process the parts that will become the sword points at both ends. Therefore, the fourth
Efforts such as embedding as shown in the figure have been made, but such processing requires a lot of man-hours and is not suitable for mass production. In order to improve these drawbacks, a method has been adopted in which resin is injected into the gap created between the inner bent portion substrate and the decorative board.
This method has problems with sealing at both ends and requires a lot of man-hours, such as filling with clay. In addition, since the void is left as is, the shape of the stamping die is determined when processing the post form. Therefore, when there are various shapes and shapes (curvatures), it is necessary to prepare a mold that matches the shape.

The present invention efficiently performs internal bending with various curvatures (# t
A method for simultaneously performing l:2':n:':r sealing will be described with reference to the drawings as an embodiment of the present invention.

For example, as shown in FIG. 5, corner materials (2) cut in approximately 10 tones approximately in the desired bent shape are attached to both ends of the four substrates (1), and an injection port (5) is made. As the corner material, carved wood, molded rubber, etc. can be used, but commercially available styrofoam facing material is inexpensive and does not require difficult processing. By inserting corner material at both ends, the decorative board follows the curved surface of the corner material during bending, so if the die is set to the minimum curvature, internal bending of various curvatures can be processed with a high-speed die. Become. If a high viscosity synthetic resin (4) is applied to the surface of this corner material, the decorative board (3) should be applied during inward bending.
), the corner material, and the base material are filled with this high viscosity synthetic resin, making it possible to seal both ends at the same time as bending. The sealed state is shown in FIG. Examples of high-viscosity synthetic resins include vinyl acetate-based emulsion type adhesives and silicone caulking agents commonly used for woodworking, but they generally have low volatile content and
It is best to use an epoxy adhesive that hardens slowly at room temperature. When bending and sealing are performed at the same time in this way, resin can be injected immediately after bending.

As described above, by the method of the present invention, it is possible to accurately and efficiently perform inward bending of a thermosetting resin decorative board.

[Brief explanation of drawings]

Figure 1 is a schematic diagram showing the conventional outward bending process for decorative boards;
4 to 4 are schematic diagrams showing a conventional method for inwardly bending a decorative board, and FIGS. 5 and 6 are schematic diagrams showing a method for inwardly bending a decorative board according to the present invention. Patent applicant Sumitomo Bakelite Co., Ltd. Figure 1 A, Figure 20, Figure 3, Figure 4, Figure 5, Figure 6

Claims (1)

[Claims] In the method of bending and pasting a thermosetting resin decorative board and a substrate using post-form processing, when filling the gap between the decorative board and the board with room-temperature curing liquid synthetic resin, Correct the desired bending shape on both ends □
A method for inward bending a thermosetting resin decorative board, which is characterized by attaching a corner material and applying a high viscosity synthetic resin to the surface of this corner material.