JPH0741626B2 - Method for producing multi-layer resin structure composed of high-density resin layer and foamed resin layer - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-layer resin structure comprising a high-density resin layer and a foamed resin layer for continuously molding a two-layer molded body of a high-density resin layer and a low-density foamed resin. It relates to the manufacturing method.

[0002]

2. Description of the Related Art Conventionally, heat insulation and cold insulation containers or dew trays of air conditioners and refrigerators have a two-layer structure in which a high density resin layer and a low density foamed resin layer are laminated. Then, conventionally, as a method for producing a multilayer resin structure of such a high-density resin layer and a low-density foamed resin layer, the high-density resin layer and the low-density foamed resin layer are separately molded by dedicated molding equipment. By combining (adhering if necessary) both, or by molding the high-density resin layer with a dedicated molding machine and mounting the molded product in the molding machine for the low-density foamed resin layer. A method of manufacturing by simultaneously heat-fusing a high-density resin and a low-density foamed resin is also known.

[0003]

However, in the conventional manufacturing method as described above, a dedicated molding device for molding each resin is required, workability is poor and uneconomical, and the molded resin is handled. When handling is difficult and when an adhesive is used to fix the resins together, there are drawbacks such as inability to recycle after use. Further, it has not been possible to continuously manufacture at low cost a multi-layer resin structure suitable for use such as a structure for weight reduction and a heat insulating container having a surface finishing layer.

The present invention was devised in order to solve the above-mentioned problems, and a set of molds (one convex mold and two concave molds or vice versa) has a high density according to the use. It is an object of the present invention to inexpensively obtain a multilayer resin structure including the resin layer and the foamed resin layer of low density.

[0005]

The present invention will be described below with reference to the accompanying drawings. First, in FIGS. 1 and 3, a foaming agent is contained in a cavity 4 larger than a predetermined shape of a molded product formed by the concave mold 2 and the convex mold 3 of the high-density resin molding mold 1. The granular resin material is charged by the material charging device 5,
The concave side mold 2, the convex side mold 3 and the material are pressed while being heated or after being pressed, the high density resin layer 8 is molded. The material in the chamber 4 is subjected to a pressurizing process by moving (advancing and retracting) the concave side mold 2 or the convex side mold 3 in the double-headed arrow (i) direction. The heating process is performed by heating or indirect heating with steam in both jackets 6 and 7. Then, the concave-side mold 2 and the convex-side mold 3 are opened, and the concave-side mold 2 shown in FIGS. 1 and 2 or the convex-side mold 3 shown in FIGS. The side mold 2 shown in FIGS. 1 and 2 or the convex side mold 3 shown in FIGS. 3 and 4 are moved in the double-headed arrows B and C, and the corresponding convex mold 11 of the foamed resin layer molding mold 9 shown in FIGS. Alternatively, the concave-side mold 10 is filled with a granular foamed resin material in a void 12 formed by the high-density resin layer 8 and the material injection device 1 shown in FIG.
It is characterized in that the high-density resin layer 8 and the foamed resin layer 17 are completely adhered to each other by heat fusion, and are simultaneously molded. In addition, 14 and 15 are jackets for indirect heating by steam of the material, and 16 is a release pin for taking out the product.

[0006]

According to the present invention, a set of molds (one convex mold and two concave molds or vice versa) comprises a high density resin layer and a low density foamed resin layer, and is a multi-layer resin according to the application. The structure can be continuously manufactured at low cost. That is, by changing the thickness of the resin layer and the thickness of the foamed resin layer, it is possible to inexpensively manufacture a multi-layer resin structure suitable for a purpose such as a structure for weight reduction, a heat insulating container having a surface finishing layer, and the like. Further, the present invention, conventionally manufactured separately, can be molded by perfect adhesion at the same time with the same molding machine, and if the material of the high-density resin layer and the material of the foamed resin layer are the same, at the time of disposal and It is effective at the time of recycling, and a low-cost multilayer molded product can be obtained.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an example of a high-density resin molding process.

FIG. 2 is an explanatory diagram of an example of a multilayer resin molding process.

FIG. 3 is an explanatory view of another embodiment of a high density resin molding process.

FIG. 4 is an explanatory view of another embodiment of the multi-layer resin molding process.

[Explanation of symbols]

 1 Mold for high density resin layer molding 2,10 Mold for concave side 3,11 Mold for convex side 4,12 Vacancy 5,13 Material feeder 6,7 Jacket 8 High density resin layer 9 Mold for molding foamed resin layer Mold 14,15 Jacket 16 Release pin 17 Foam resin layer

Claims (1)

[Claims] A granular resin material or a powdered resin material containing no foaming agent is put into an empty space larger than a predetermined shape of the molded product formed by the concave mold and the convex mold of the high-density resin layer molding mold. ,
A high-density resin layer molded product is formed by pressing the mold and material while heating or heating the mold to form a high-density resin layer, opening the mold, and then forming one of the concave-side mold or the convex-side mold. While moving the concave side mold or convex side mold, the corresponding convex side mold or concave side mold of the foaming resin layer molding mold and the empty chamber formed by the high density resin layer Granular foamed resin material (which has already undergone primary foaming,
High density resin layer and foaming, characterized in that the high density resin layer and the foamed resin layer are completely adhered to each other by heat fusion A method for producing a multilayer resin structure comprising a resin layer.