CPC B29C 44/105 (2013.01) [B29C 44/0415 (2013.01); B29C 44/3415 (2013.01); B29C 44/3442 (2013.01); B29K 2081/04 (2013.01)] | 15 Claims |
1. A method for producing a foam-molded product by using a plasticizing cylinder which has a plasticization zone for plasticizing and melting a thermoplastic resin into a molten resin and a starvation zone for allowing the molten resin to be in a starved state, and which has an introducing port for introducing a physical foaming agent into the starvation zone,
the method comprising:
plasticizing and melting the thermoplastic resin to provide the molten resin in the plasticization zone;
introducing a pressurized fluid containing the physical foaming agent at a fixed pressure into the starvation zone, thereby retaining the starvation zone at the fixed pressure;
allowing the molten resin to be in the starved state in the starvation zone;
bringing the molten resin in the starved state in contact with the pressurized fluid containing the physical foaming agent at the fixed pressure, in the starvation zone in a state in which the starvation zone is retained at the fixed pressure; and
molding the molten resin having been brought in contact with the pressurized fluid containing the physical foaming agent into the foam-molded product,
wherein the thermoplastic resin contains 60% by weight or more of a super engineering plastic, and the fixed pressure is from 0.5 MPa to 6 MPa, and
wherein the thermoplastic resin does not contain a chemical forming agent.
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