Method for manufacturing foam molded body and foam molded body

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 is a super engineering plastic, and
• either the super engineering plastic contains a polyphenylene sulfide and the fixed pressure is from 2 MPa to 10 MPa, or
• the super engineering plastic contains a liquid crystal polymer and the fixed pressure is from 1 MPa to 6 MPa, and
• wherein the thermoplastic resin does not contain a chemical forming agent.