THERMOPLASTIC RESIN FOAMED BODY AND ITS MANUFACTURE

PROBLEM TO BE SOLVED: To obtain a foamed body with fine cell structure for providing more excellent mechanical strength than that of a thermoplastic resin foamed body manufactured by a conventional extrusion foaming method. SOLUTION: Carbon dioxide and/or nitrogen under supercritical condition are u...

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Bibliographische Detailangaben
Hauptverfasser:	AMAMIYA HIDEO, ERIGUCHI MASAO, NISHIKAWA SHIGEO, INOUE HARUO, YODA KAORU, SUEDA KIMIYOSHI, ICHIKAWA KOZO
Format:	Patent
Sprache:	eng
Schlagworte:	AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING CHEMISTRY COMPOSITIONS BASED THEREON GENERAL PROCESSES OF COMPOUNDING INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS PERFORMING OPERATIONS SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR SHAPING OR JOINING OF PLASTICS THEIR PREPARATION OR CHEMICAL WORKING-UP TRANSPORTING WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL WORKING-UP
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To obtain a foamed body with fine cell structure for providing more excellent mechanical strength than that of a thermoplastic resin foamed body manufactured by a conventional extrusion foaming method. SOLUTION: Carbon dioxide and/or nitrogen under supercritical condition are used as a foaming agent and a die has a shear velocity adjusting part 12 which has a function for generating shear velocity of a molten resin compsn. in a range of 10 -10 sec and thereafter, a flow rate distribution adjusting part 13 which has a function for decreasing the shear velocity. This shear velocity adjusting part has a structure wherein the cross sectional area of a cross section being vertical to the resin flowing direction at the upstream side of a resin flow path is narrowed (the mean cross sectional area is A) and the flow rate distribution adjusting part has a structure contg. a part wherein the same cross section is expanded at the downstream side of the flow path (the mean cross sectional are area B) and B/A is 1.3-20.