|국가/구분||United States(US) Patent 등록|
|미국특허분류(USC)||264/455 ; 264/50 ; 264/51 ; 264/3281|
|발명자 / 주소|
|출원인 / 주소|
|인용정보||피인용 횟수 : 23 인용 특허 : 2|
A process is disclosed for molding a foamed thermoplastic article characterized by a foamed core, a non-foamed exterior shell and a surface that reproducibly and faithfully replicates a predetermined portion of the inner surface of the mold in which the article is made, wherein a foamable mixture comprising molten thermoplastic material and blowing agent is introduced through a nozzle into a mold cavity defined by said inner surface of said mold and expands and is rigidified while in said mold cavity.
A process for molding a foamed thermoplastic article characterized by a foamed core, a non-foamed exterior shell, and a surface that faithfully and reproducibly replicates a predetermined portion of the inner surface of the mold which comprises: feeding as a charge a molten mixture of a thermoplastic polymer and a soluble gas foaming agent into a mold maintained at a temperature sufficiently low to cause the outer portion of said mixture to form a self-supporting exterior shell in said mold and at a volume sufficient, in the unfoamed state, to substantia...