JPH07911A - Production of curved decorative plate - Google Patents

Abstract

PURPOSE:To produce the curved decorative plate having prescribed curvature at the point of time when a coating material cures by setting the curvature of the target curved surface by estimating the return quantity that a base material coated with the coating material for decoration shrinks after curing and curing the coating material while restraining a form. CONSTITUTION:The base material 4 coated with the coating material for decoration on the outer peripheral curved surface is first installed into the form consisting of a frame 1, a slide frame 2 sliding therein and hooks 3 respectively installed thereto at the time of production. The target chordal arc spacing of the curved decorative plate is A at this time but the expansion determined by the rigidity of the base material 4, the shrinkage rate on curing of the coating material and the shape retaining force of the cured coating material arises after curing of the coating material for decoration and, therefore, the form is restrained by applying load on the hooks 3 in such a manner as to attain the curvature chordal arc of A plus (x) added with the return quantity (x). The coating material for decoration is cured while the spacing (w) between the opposite end sides of the curved surface direction is held narrow. As a result, the spacing (w) is widened at the point of time when the curved decorative plate is taken out of the form, by which the prescribed spacing A is obtd. for the radius of the curvature chordal arc.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cosmetic coating after curing, in which a variation in curvature due to curing shrinkage of a cosmetic coating applied to the surface of a plate-shaped substrate having a curved surface in one direction is taken into account and restrained by applying a load. The present invention relates to a method for manufacturing a curved surface decorative plate having an arbitrary curvature by utilizing the shape retaining force.

[0002]

2. Description of the Related Art Conventionally, when a cosmetic paint (including resin) is applied to one curved surface of a unidirectional curved plate-shaped substrate such as a cement board, a gypsum board or a plywood, the applied surface is cured and shrunk. Since the curved plate-shaped base material shrinks beyond the target product's bending curvature, all correction processing is performed after this shrinkage, but cracks occur on the coated surface and the product yield is poor.

Therefore, recently, rigidity is added to the composition of the base material itself, or the thickness is made thick enough not to cause shrinkage due to hardening of the cosmetic coating so that the base material has a predetermined curvature in advance. After processing, apply the cosmetic paint to one side of the curved surface, or apply the cosmetic paint with the same shrinkage force as the front side to the back side of the base material that is uneasy to apply. A method is adopted in which even if the material shrinks upon curing, it shrinks uniformly on both sides so that the preset curvature does not change.

[0004]

However, the conventional composition of the base material itself is made to have rigidity, or the base material having a large thickness is processed into a desired curvature in advance. After that, the method of applying the cosmetic coating increases the cost of the base material itself and also increases the weight of the base material.
Excessive equipment and jigs were required during transportation and the makeup process. Further, the method of applying the cosmetic coating on the back side to cause the same shrinkage as the front surface to maintain the curvature of the base material causes problems such as an increase in the work process and an increase in the amount of the cosmetic coating. It was

Therefore, the present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to increase the thickness of the base material and to apply only the surface requiring coating to cosmetics. When the paint is applied and the cosmetic paint cures and shrinks, the base material retains the required and arbitrary curvature.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above object, and when applying a cosmetic coating to either one surface of a rectangular plate-shaped substrate having a curved surface in one direction. , The spacing w between the edge sides in the curved surface direction is expanded or contracted by the restraining force added with the weight.

[0007]

[Function] When a cosmetic coating is applied to the outer surface of a rectangular plate-shaped base material having a curved surface in one direction, the coating material shrinks as it hardens. The interval w increases. Further, when the coating material for cosmetics is applied to the inner surface, the curvature of the curved surface becomes small and the distance w between the end sides in the curved surface direction is reduced. This expansion / contraction amount is determined by the rigidity of the base material, the curing shrinkage amount of the coating material, and the rigidity of the cured coating material, that is, the shape retention force. Therefore, when applying the cosmetic coating on the outer surface, the interval w between the end sides of the curved surface side is narrowed in consideration of the amount of expansion, and when applying the cosmetic coating on the inner surface, the curved surface side If the spacing w between the end sides is constrained while expanding in anticipation of the amount of shrinkage, the spacing w between the side edges in the curved surface direction becomes a required and arbitrary dimension at the time when each cosmetic coating hardens. Become.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail based on the embodiments shown in the drawings. FIG. 1 is a development view showing an embodiment of a method for manufacturing a curved decorative plate having a required curvature by applying makeup to the outer curved surface of the base material according to the present invention. In the figure, frame 1
The base material 4 having the outer curved surface coated with the decorative paint is placed in the form frame made up of the hook 3 installed on the slide frame 2 that slides in the frame 1. The target curvature chord arc interval of the curved decorative plate is A, but after curing the cosmetic coating, expansion occurs depending on the rigidity of the base material 4, the curing shrinkage amount of the coating material, and the shape retention force of the cured coating material. The hook 3 in the mold is weighted so as to have a curvature chord arc interval of A plus x, and the mold is constrained.
If the cosmetic coating applied to the base material 4 is cured while the width is narrowed, the interval w between the side edges in the direction of the curved surface of the curved decorative plate expands at the time of taking it out of the form, and the curvature chord of the curved decorative plate. The arc interval becomes a predetermined interval A, and a curved decorative plate having a predetermined curvature can be obtained.

FIG. 2 is a development view showing an embodiment of a method for producing a curved surface decorative plate having a required curvature by applying makeup to the inner curved surface of the base material according to the present invention. In the figure, a base material 4 having an inner curved surface is placed in a formwork consisting of a frame 1 and a bag-shaped hook 3 installed on a slide frame 2 that slides in the frame 1. The target curvature chord arc interval of the curved decorative plate is A, but after the hardening of the cosmetic coating, shrinkage occurs depending on the rigidity of the base material 4, the curing shrinkage amount of the coating material, and the shape retention force of the cured coating material. The hook 3 in the mold is weighted so as to have a curvature chord arc interval of A minus x, and the mold is restrained.
If the cosmetic coating applied to the base material 4 is cured while the width is widened, the space w between the curved side edges of the curved decorative plate becomes narrower when it is taken out from the mold, and the curvature chord of the curved decorative plate is reduced. The arc interval becomes a predetermined interval A, and a curved decorative plate having a predetermined curvature can be obtained.

FIG. 3 is a perspective view showing an apparatus for manufacturing a plurality of substrates according to the present invention. In the figure, a pair of hooks 3 in five stages is installed between a case 5 and a support 7. The adjustment of the distance between the hooks has a structure in which the column 7 is slid in the upper and lower guides 6.

[0011]

As described above, according to the method for manufacturing a curved decorative board according to the present invention, the target curvature of the curved surface of the base material coated with the cosmetic coating is set in consideration of the amount of rebound that expands and contracts after curing. Is set and the hook is weighted and cured while being constrained, so that when the paint is cured, it is possible to manufacture a curved decorative plate having a required and arbitrary curvature. Therefore, it is not necessary to give rigidity to the composition of the base material itself or to increase the thickness of the base material to give rigidity. Also, it is not necessary to apply a cosmetic coating that causes the same shrinkage to the back side of the base material.

[Brief description of drawings]

FIG. 1 is a development view showing an embodiment of a method for manufacturing a curved decorative plate having a required curvature by applying makeup to the outer curved surface of a base material according to the present invention.

FIG. 2 is a development view showing an embodiment of a method for producing a curved decorative plate having a required curvature by applying makeup to the inner curved surface of the base material according to the present invention.

FIG. 3 is a perspective view showing an apparatus for manufacturing a plurality of base materials according to the present invention.

[Explanation of symbols]

 1 Frame 2 Slide Frame 3 Hook 4 Base Material 5 Case 6 Guide 7 Support

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tsuyoshi Yokoyama 1-12-32 Nishihonmachi, Ube City, Yamaguchi Ube Kosan Co., Ltd.

Claims (1)

[Claims] 1. When applying a cosmetic coating to one of the surfaces of a rectangular plate-shaped substrate having a curved surface in one direction, the spacing w between the side edges of the curved surface is caused by the restraining force applied with a weight. A method for manufacturing a curved surface decorative board, characterized by expanding and contracting the surface.