JPS62238139A - Trimming material for automobile - Google Patents

Abstract

PURPOSE:To facilitate molding well in response to the form of a mold so as to prevent the generation of breakage and wrinkle at the time of molding by welding a layer of synthetic resin liner to both or one face of a paper core having many small projecting parts and depositing a skin material on said liner. CONSTITUTION:Spaces are formed by means of a paper core 1, which, together with a synthetic resin liner 2 which is welded to the core 1, has a function to provide lightness and rigidity as a base material. Also, a number of small projecting parts 11 are formed on the core 1 to balance elongation and readiness of elongation in both longitudinal and lateral directions. The synthetic resin liner 2 can be formed by extrusion welding coating. And, the liner 2 made of a synthetic resin can be softened or molten by heating prior to molding, to provide a deformable function at the time of cold press molding. Accordingly, the generation of breakage and wrinkle which are liable to occur when molding can be nearly removed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an automobile interior material that is rigid and has good moldability.

Snack cardboard), resin-impregnated fiber aggregate, hard thermoplastic rod, resin foam layer, metal lath, etc. are used. Among them, lightweight paper cardboard is prone to wrinkling and tearing during molding, so as an improvement, the liner and corrugated center are bonded or bonded with synthetic resin.

[Problem that the invention seeks to solve]

When the above-mentioned interior material based on paper-based cardboard is molded with a heating mold, it is difficult to deform in response to the shape of the mold, and there is a problem that wrinkles and tears are likely to occur. In particular, the problem that there is a large difference in the elongation in the extending direction of the corrugated form from the perpendicular direction and the elongation during molding, and the elongation in the extending direction of the corrugated form is low, which tends to cause defects such as tearing and wrinkles during molding, has been improved. It also exists for things that have been done.

[Failure to solve the problem]

The object of the present invention is to develop an interior material that does not have the above-mentioned drawbacks.

That is, the present invention provides a medium having a large number of small convex portions made of paper.

The core used here has a large number of small convex portions as shown in the figure. As the resin forming the liner, polyethylene, polypropylene, ethylene copolymer resin, styrene resin 2 polyethylene terephthalate/isophthalate copolymer resin, nylon 12, etc. can be used.

In order to use it as an interior material, a skin material is fixed to the entire surface of the first liner. As for the skin material, a limited number of materials can be used (i.e., woven fabrics, non-woven fabrics, vinyl chloride sheets, elastomer sheets, etc.) that are currently used, or they can be laminated with a cushioning material such as urethane foam and attached to the liner in one layer. be done.

[For production]

In the above configuration, a space is formed by the paper core, and together with a synthetic resin liner welded to the core, the paper core functions as a base material to provide light weight and rigidity. The middle core should form many small convex parts! We try to balance the elongation in the direction and the ease of elongation.

Synthetic resin liners can be formed by extrusion melt coating. Since it is made of synthetic resin, it has the function of being softened or melted by heating before molding, and easily deformed during cold press molding.

[Example 1] 4009An! Polypropylene resin of 300 Mrf is extruded and melt-coated on both sides of the core, which has many small convex portions, while one side is coated with 300 Mrf polypropylene resin. The interior material was prepared by welding and laminating the skin material made of the polyester nonwoven fabric of j~.

This interior material was heated in a heating furnace to soften or melt the polypropylene, and cold press molding was performed.

90° 4 hours - 40'C 1,5 hours 1 for molded products
A 4-cycle thermal cycle test was conducted,
The presence or absence of shape changes, dimensional changes, and peeling was investigated.

All cases of vomiting were molded products with almost no change.

[Example 2] A base material was prepared by extruding and melt-coating each 3001/ypt" polypropylene on both sides of the core of Example 1. This base material was heated from both sides in a heating furnace, and immediately the material was coated with a hot-melt surface. The skin material was spread onto the surface of the molded product, and at the same time as compression molding, preheating was used to weld the skin material to the liner surface.

The molded product was subjected to the thermal cycle test of Example 1.

A product with virtually no changes in appearance or dimensions and no problems in practical use was obtained.

[Example 3-4] Using the above-mentioned core, various liners were molded using a layer of skin material, and a heat cycle test similar to that in Example 1 was carried out, showing almost no change, and no wrinkles or tears. was gotten.

Structure of interior material [Effects of the invention] The present invention uses a paper core with many small convex portions, so elongation in the warp direction and ease of stretching are improved compared to conventional corrugated cores. By using a synthetic resin, the liner can be easily stretched during molding, and both of these make it easier to mold according to the shape of the mold, making molded automobile interior materials virtually free of tears and wrinkles that often occur during molding. I was able to make it.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing the structure of the internal utilization of the present invention. FIG. 2 is a cross-sectional view thereof. FIG. 3 is an explanatory diagram showing the structure of a conventional example. In the figure, 1 is a paper core, 11 is a small convex portion 2.3 is synthetic resin
Liner 4 represents the epidermal layer.

Claims (1)

[Claims] (1) An automobile interior material characterized in that a synthetic resin liner is formed on both or one side of a core having a large number of small convex portions made of paper, and a skin material is attached to one of the liners.