Process and device for producing foamed molded object
AssigneeMaxell, Ltd.
InventorsSatoshi Yamamoto, Atsushi Yusa, Hideto Goto
Life of this patent
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Abstract
There is provided a method of producing a foamed molded product, including: plasticizing and melting a resin material containing a thermoplastic resin and a chemical foaming agent in a plasticizing cylinder in which a screw is provided, to provide a molten resin containing the chemical foaming agent; supplying a fluid with a fixed pressure into the plasticizing cylinder to pressurize the molten resin; and performing foam molding of the molten resin. The resin material contains 0.1 to 2% by weight of the chemical foaming agent.
Claims19
A method of producing a foamed molded product, the method comprising:
- providing a plasticizing cylinder in which a screw is provided, which is configured to plasticize and melt a resin material containing a thermoplastic resin and a chemical foaming agent to provide a molten resin, and which has a starvation zone, the starvation zone being not full of the molten resin;
- plasticizing and melting the resin material in the plasticizing cylinder, to provide a molten resin containing the chemical foaming agent;
- supplying a fluid with a fixed pressure into the plasticizing cylinder to pressurize the molten resin in the starvation zone;
- and
- performing foam molding of the molten resin,
- wherein the resin material contains 0.1 to 2% by weight of the chemical foaming agent, and pressure in the starvation zone is kept at the fixed pressure.
A production apparatus for a foamed molded product, comprising:
- a plasticizing cylinder configured to plasticize and melt a resin material to provide a molten resin and including a starvation zone which is not full of the molten resin, and
- a fluid supply mechanism configured to continuously supply a fluid with a fixed pressure to the starvation zone of the plasticizing cylinder during production of the foamed molded product.
Dependencies are inferred from the claim text.