JPS6144812Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a resin bead foam molded product.

Resin bead foam, of which polystyrene bead foam is a typical example, is produced by filling heat-expandable resin beads into a closed mold cavity, and then introducing steam or hot air into the cavity to separate individual resin beads. It is a solid foam molded product in which individual resin bead foam cells obtained by thermally foaming (e.g. 3 to 20 times) are fused together by foaming pressure and heat, and it is lightweight, heat insulating, and compressible. Its strength and bending strength are far superior to, for example, cork, and it is non-hygroscopic and non-water absorbent.
It is widely used as heat insulating materials, cushioning packaging materials, core materials for lightweight construction materials, substrate materials for vehicle interior materials, and more.

By the way, since the resin bead foam molded product is a mutually fused bonded body of resin bead foam cells as described above, the outer surface has a mesh-like fused boundary between the bead foam cells 1 as a ground pattern as shown in the first figure. Line pattern 2 is visible. This pattern 2 is clearly visible in whole or in part depending on the condition of the light beam, and does not give a very good impression aesthetically.

Therefore, when constructing an article for which aesthetics and external appearance are important, when using the foam as a material, the foam should not be used with the bare skin exposed as it is, but the outer surface should be covered with another appropriate decorative skin material layer. It is used in a covered and concealed form. However, covering and concealing the outer surface using other decorative skin materials increases the number of manufacturing steps and increases the product cost.

This proposal has been proposed in view of the above, and is designed to make the fused boundary line pattern 2 between the bead foam cells that inevitably appears on the outer surface of the resin bead foam molded product as inconspicuous as possible. The purpose is to obtain a product using this type of foam that improves the aesthetic appearance and has a good appearance even without the need for coating with a skin material layer, that is, even when the skin is left exposed, and is therefore inexpensive in terms of cost. .

That is, by using colored beads of any color as the raw material foamable resin beads, a colored molded product is obtained, and the entire outer surface or a required outer surface area is approximately the same as the mesh-like fused boundary line pattern 2 between the bead foam cells 1. The gist of the present invention is a resin bead foam molded article characterized by having an uneven grain pattern surface 3 (FIG. 2) with a certain degree of roughness.

Colored beads can be obtained by adding and blending an appropriate amount of a colorant of any color during the production of expandable resin beads.

To impart the textured pattern 3 to the surface of the molded product, the molding surface of the mold 4 for producing the molded product is made to have the textured pattern on the entire surface or in a predetermined region. Alternatively, a mold may be used in which a pattern mold 5 made of porous flesh with a textured pattern transferred thereto is pasted or fitted onto the molding surface of the mold. In the mold shown in FIG. 3, reference numeral 41 indicates a pipe for introducing steam or hot air into the cavity, reference numeral 42 indicates an injection hole into the cavity, reference numeral 43 indicates a cavity closing lid, and reference numeral 44 indicates a pipe for introducing raw material beads.

The manufacturing procedure for the molded body itself is based on the conventional method.

Therefore, the molded product of the present invention has a concave-convex grain pattern 3 with approximately the same roughness as the mesh-like fused boundary line pattern 2 between the bead foam cells 1 on the entire outer surface of the molded product or on a required outer surface area. (a) The bead foam cells 1, which are the base pattern on the surface of the molded product, have a mesh-like fused boundary line pattern 2 which is an uneven pattern 3.
And it blends into the shadows of each uneven surface.

(b) Due to the light scattering effect of the uneven rough surface, the light reflection contrast between one portion of each foam cell and two portions of each cell fusion boundary line is equalized.

(c) By making the parts colored, the light reflection contrasts of parts 1 and 2 are also made equal.

Due to the comprehensive camouflage effect of these (a) to (c), the mesh-like fused boundary line pattern 2 between the bead foam cells 1 and each other, which is the background pattern on the surface of the molded product, becomes much less noticeable, and as a result, the foam molding This type of foaming improves the appearance of the external appearance of the body and has a good appearance even without the above-mentioned intended coating treatment with the skin material layer, that is, even when the skin is left exposed, and is therefore inexpensive in terms of cost. It is possible to obtain products for body use.

Also, because it is a colored molded product, it has the advantage that dirt is less noticeable than a colorless product.

Note that the beads serving as the raw material may be used selectively, such that colored beads are used only for the surface layer of the molded body, and uncolored beads are used for the inside.

Furthermore, by partially filling the mold with colored beads of several colors, it is possible to obtain a colorful product whose outer surface is partially different in color.

For the purpose of surface protection or polishing, a transparent lacquer may then be sprayed onto the surface of the molded product, or a thin transparent resin film may be laminated in close contact with the surface of the molded product.

[Brief explanation of drawings]

Fig. 1 is a diagram showing a mesh-like fused boundary line pattern between foamed bead cells, which is the base pattern of a resin bead foam molded product, and Fig. 2 is a cross-sectional view of a part of the proposed molded product whose outer surface has an uneven textured surface. , FIG. 3 is a sectional view of an example of a molding die. 1 is an individual foamed resin bead cell, 2 is a fused boundary line of each cell, 3 is an uneven pattern, 4 is a mold, and 5 is an uneven pattern mold.

Claims (1)

[Scope of utility model registration request] By using colored beads of any color as the raw material foamable resin beads, a colored molded product can be obtained, and the entire outer surface or a required outer surface area has a mesh approximately the same size as the mesh-like fused boundary line pattern 2 between the bead foam cells 1. A resin bead foam molded article characterized by having an uneven grain pattern surface 3 with a roughness of .