JPH0129690B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a molding having a colored layer.

Long synthetic resin moldings for vehicles, such as body side moldings, are often manufactured by extrusion molding, but when forming colored layers such as color stripes, it is relatively difficult to manufacture by extrusion molding. be. For example, in order to perform double extrusion molding by extruding the resin that forms the molding body and the resin that forms the colored layer from an extrusion mold, two extruders must be connected, and the flow of both resins must be accurately controlled. The problem is that it is difficult to control. Further, when a film-like material made of a colored resin is fed into an extrusion mold and extrusion molded, the film-like material melts and becomes distorted, making it impossible to form a uniform colored layer.

In order to solve these problems, although it is not publicly known, extrusion molding is carried out by feeding a sheet-like material in which a high temperature stable transparent resin layer such as polyester resin is laminated onto a film consisting of a colored resin layer to an extrusion mold. As a result, a uniform colored layer is formed, and this colored layer is welded to the molding body, eliminating the risk of peeling or the like.

FIG. 1 is a cross-sectional view showing a sheet-like material in such a manufacturing method, and FIG. 2 is a perspective view with the front portion of the manufactured molding cut away. The sheet material 1 is formed by laminating a high temperature stable transparent resin layer 3 on a colored resin layer 2. By supplying such a sheet material 1 to an extrusion mold (not shown) and extrusion molding, a molding body 4 is formed.
The sheet material 1 is welded to the surface of the molding 6, which has a uniform colored layer 5 on the surface.

However, the molding 6 manufactured by this method has a high temperature stable transparent resin layer 3 that is easily attacked by ultraviolet light on the surface of the colored layer 5, so the weather resistance is poor and the transparent resin layer 3 discolors. There were problems such as deterioration, strength reduction, and cracking.

This invention was made in view of the above-mentioned problems, and involves supplying and extruding a sheet-like material in which an ultraviolet-blocking transparent resin layer is laminated on a colored resin layer and a high-temperature stable transparent resin layer. This aims to solve the above problems.

In this invention, a sheet-like material in which a colored resin layer of a different color that is compatible with the molding body, a high-temperature-stable transparent resin layer, and an ultraviolet-blocking transparent resin layer are laminated in the above order is supplied to an extrusion mold, and then A method for manufacturing a molding, characterized by extrusion molding so that a colored resin layer of the material is welded to the surface of the molding body, and a UV-blocking transparent resin layer is exposed on the outermost surface to form a colored layer. It is.

The present invention will be explained below based on the drawings. FIG. 3 is a cross-sectional view showing a sheet-like material according to an embodiment of the present invention, and FIG. 4 is a perspective view with the front part of the manufactured molding cut away, with the same reference numerals as in FIGS. 1 and 2. indicate the same or equivalent part.

The sheet-like material 1 has a high-temperature stable transparent resin layer 3 laminated on a colored resin layer 2, and an ultraviolet-blocking transparent resin layer 7 further laminated thereon. As the colored resin, there are resins that are compatible with the resin forming the molding body 4 and have a different color from the molding body 4, and it is particularly preferable to use the same colored resin. The high-temperature stable transparent resin is a transparent resin that does not melt, soften, or significantly expand or contract under high temperatures during extrusion molding, and for example, polyester resin such as polyethylene terephthalate resin can be used. Ultraviolet-blocking transparent resins are transparent resins that block ultraviolet rays by absorbing them and preventing them from reaching the layers below. For example, polyvinyl chloride resins with added ultraviolet absorbers, polyvinyl tetrafluoride resins, acrylic resins, etc. are used. can.

The colored resin layer 2, the high-temperature-stable transparent resin layer 3, and the ultraviolet-blocking transparent resin layer 7 are laminated in a sheet shape by welding or adhesion to form the sheet material 1. It is preferable to bond each layer with an adhesive and laminate them, since elongation during extrusion is less likely to occur. Here, the term "sheet-like" includes shapes similar to sheets, such as plates, films, and tapes, and tape-like materials are particularly preferred because they can be continuously fed to an extrusion mold.

Such a sheet-like material 1 is fed into an extrusion mold to perform extrusion molding, and a colored resin layer 2 is welded to the surface of the molding body 4, which is an extruded product, near the outlet of the die to form a transparent ultraviolet-blocking material. The colored layer 5 is formed by exposing the resin layer 7 to the outermost surface.
At this time, the colored resin layer 2 is softened by the temperature of the resin forming the molding body 4 and is welded to the molding body 4, but the high temperature stable transparent resin layer 3
Since it maintains a sheet shape without softening, the colored resin layer 2 is not disturbed, and a colored layer 5 having a uniform appearance and adhesiveness is formed.

As the resin for forming the molding body 4, polyvinyl chloride resin, ethylene vinyl acetate resin, polypropylene resin, etc. can be used. The same applies to colored resins. The extrusion molded product in which the sheet material 1 is welded or bonded is cut into a predetermined size to form a molding 6.

The molding 6 obtained as described above has an excellent appearance because the colored layer 5 is uniformly formed at a predetermined position, has good adhesion of the colored layer 5 to the molding body 4, and blocks ultraviolet rays. Since the high-temperature stable transparent resin layer 7 prevents the high-temperature stable transparent resin layer 3 from discoloring, decreasing its strength, etc., it can be used stably for a long period of time.

FIG. 5 is a cross-sectional view of a part of a molding manufactured according to another embodiment, and shows a sheet material 1
The sheet-like material 1 is welded to the molding body 4 at the position indicated by the cross, and the uppermost layer of resin is extruded. Since the layer 7 is also welded, the adhesion of the sheet-like material 1 is increased, and separation of the resin layers 3 and 7, water intrusion between the layers, etc. can be prevented.

In the above description, the shape, structure, material, etc. of the sheet material 1 and the molding body 4 are not limited to those described above, and can be changed, and the structure of the extrusion mold can also be arbitrarily selected. Further, the present invention is applicable not only to the production of moldings for vehicles but also to the production of other moldings.

As explained above, according to this invention,
The sheet-like material laminated with a colored resin layer, a high-temperature-stable transparent resin layer, and an ultraviolet-blocking transparent resin layer is supplied to an extrusion mold and extruded to form a colored resin layer, so the device is simple. Through these operations, it is possible to manufacture a molding with a colored layer that is uniformly formed in a predetermined position and has good adhesion.The manufactured molding has excellent weather resistance and can be used stably over a long period of time. Effects such as this can be obtained.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of a sheet-like material in a conventional manufacturing method, Fig. 2 is a perspective view with the front part of the manufactured molding cut away, and Fig. 3 is a cross-sectional view of a sheet-like material in an embodiment of the present invention. FIG. 4 is a perspective view with the front portion of the manufactured molding cut away, and FIG. 5 is a cross-sectional view of a part of the molding manufactured according to another embodiment. In each figure, the same reference numerals indicate the same or equivalent parts, 1 is a sheet material, 2 is a colored resin layer, 3 is a high temperature stable transparent resin layer, 4 is a molding body,
5 is a colored layer, 6 is a molding, and 7 is an ultraviolet-blocking transparent resin layer.

Claims (1)

[Claims] 1. A sheet-like material in which a differently colored resin layer compatible with the molding body, a high temperature stable transparent resin layer, and an ultraviolet blocking transparent resin layer are laminated in the above order is supplied to an extrusion mold. The molding is characterized in that the colored resin layer of the sheet material is welded to the surface of the molding body, and the molding is extruded so that the ultraviolet-blocking transparent resin layer is exposed on the outermost surface to form a colored layer. Deing manufacturing method. 2. The method of manufacturing a molding according to claim 1, wherein the end portion of the sheet material in the width direction is embedded in the molding body and extrusion molded. 3. The molding manufacturing method according to claim 1 or 2, wherein the sheet material is supplied in the form of a tape. 4. The method for manufacturing a molding according to any one of claims 1 to 3, wherein the high temperature stable transparent resin is a polyester resin. 5. The method for producing a molding according to any one of claims 1 to 4, wherein the ultraviolet-blocking transparent resin is a polyvinyl chloride resin, vinyl tetrafluoride resin, or acrylic resin added with an ultraviolet absorber. .