US 11,945,140 B2
Method for manufacturing foam molded body and foam molded body
Atsushi Yusa, Nagaokakyo (JP); Hideto Goto, Muko (JP); and Satoshi Yamamoto, Suita (JP)
Assigned to MAXELL, LTD., Kyoto (JP)
Filed by MAXELL, LTD., Kyoto (JP)
Filed on Feb. 16, 2023, as Appl. No. 18/170,266.
Application 18/170,266 is a continuation of application No. 17/591,917, filed on Feb. 3, 2022, granted, now 11,648,713.
Application 17/591,917 is a continuation of application No. 16/716,664, filed on Dec. 17, 2019, granted, now 11,260,564, issued on Mar. 1, 2022.
Application 16/716,664 is a continuation of application No. PCT/JP2018/020294, filed on May 28, 2018.
Claims priority of application No. 2017-124317 (JP), filed on Jun. 26, 2017.
Prior Publication US 2023/0202080 A1, Jun. 29, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. B29C 44/10 (2006.01); B29C 44/04 (2006.01); B29C 44/34 (2006.01); B29K 81/00 (2006.01)
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
OG exemplary drawing
 
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.