DE2400617

1452421 Foamed polypropylene articles SUMITOMO CHEMICAL CO Ltd and TOYO CLOTH CO Ltd 9 Jan 1974 [9 Jan 1973] 1083/74 Heading B5A [Also in Division C3] A mixture of crystalline and non-crystalline propylene polymer and optionally low density polyethylene together with azodicarbonamide is extruded fro...

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Hauptverfasser:	OGAWA, TOMIO, OSAKA, JP, SHIOZAWA, KAZUNOBU, IZUMISANO, JP, ITO, NOBUO, IBARAGI, JP, NISHIBAYASHI, YOSHIFUMI, SENNAN, JP, OHISHI, KANEMITSU, TOYONAKA, JP, HARADA, TARO, SUITA, JP
Format:	Patent
Sprache:	eng
Schlagworte:	AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING BOOK COVERS BOOKBINDING CHEMISTRY COMPOSITIONS BASED THEREON DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDEDFOR FILE CARDS FILES FILING APPLIANCES GENERAL PROCESSES OF COMPOUNDING INDEXING LOOSE LEAVES METALLURGY MOVABLE-STRIP WRITING OR READING APPARATUS ORGANIC MACROMOLECULAR COMPOUNDS PERFORMING OPERATIONS PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITYFEATURES PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOTOTHERWISE PROVIDED FOR SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR SHAPING OR JOINING OF PLASTICS SHEETS TEMPORARILY ATTACHED TOGETHER SPECIAL PRINTED MATTER 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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Zusammenfassung:	1452421 Foamed polypropylene articles SUMITOMO CHEMICAL CO Ltd and TOYO CLOTH CO Ltd 9 Jan 1974 [9 Jan 1973] 1083/74 Heading B5A [Also in Division C3] A mixture of crystalline and non-crystalline propylene polymer and optionally low density polyethylene together with azodicarbonamide is extruded from die 5 (see Fig. 4) and the molten foamed sheet is embossed by embossing rolls 6 and the cooled solidified sheet is then passed through a finishing roll 7. The foamed embossed sheet is pressed on one or both sides with heated metallic moulds to form grooves (see Figs. 1 and 2) which act as hinge portions when these sheets are used as book covers (Fig. 6) and files.