THERMOPLASTIC RESIN FOAMED INJECTION MOLDED BODY

PROBLEM TO BE SOLVED: To provide a foamed body having an unified non-foamed member of a good surface appearance on the surface layer and having a cell of an uniform average cell density with a fined average cell diameter. SOLUTION: The foamed body comprises: a foamed section having a cell of an aver...

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Bibliographische Detailangaben
Hauptverfasser:	AMAMIYA HIDEO, SUEDA KIMINOBU, ERIGUCHI MASAO, NISHIKAWA SHIGEO, INOUE HARUO, YODA KAORU, ICHIKAWA KOZO
Format:	Patent
Sprache:	eng
Schlagworte:	AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS PERFORMING OPERATIONS SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR SHAPING OR JOINING OF PLASTICS TRANSPORTING WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a foamed body having an unified non-foamed member of a good surface appearance on the surface layer and having a cell of an uniform average cell density with a fined average cell diameter. SOLUTION: The foamed body comprises: a foamed section having a cell of an average cell diameter of 1-50 μm and an average cell density of 108-1012pieces/cm3; and a non-foamed surface layer unified with this foamed section whose thickness is 20-1000 μm. In addition, the foamed section has a cell of an average cell diameter of 1-20 μm and an average cell density of 108-1012pieces/cm3, the foaming section is formed using supercritical state carbon dioxide and/or nitrogen as a foaming agent, the non-foamed surface layer is contacted to the low temperature wall surface of a die to be formed, and the thermoplastic resin has a melt flow index of 0.05-60 g/10 minutes at the proximity of the working temperature. COPYRIGHT: (C)2006,JPO&NCIPI