MANUFACTURE OF MULTILAYER STRETCHED PLASTIC CONTAINER

PURPOSE:To improve rigidity, low temperature strength, etc. by containing isotactic homopolypropylene in a propylene copolymer layer and raising the optimum temperature for stretching up to the stretching to temperature of an ethylene vinyl alcohol copolymer layer. CONSTITUTION:A laminated parison c...

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Bibliographische Detailangaben
Hauptverfasser:	SAKANO KOUZABUROU, YAZAKI JINICHI, SUGIMOTO TAKESHI
Format:	Patent
Sprache:	eng
Schlagworte:	AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULARARTICLES INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS LAYERED PRODUCTS LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM MAKING GRANULES OR PREFORMS PERFORMING OPERATIONS PREPARATION OR PRETREATMENT OF THE MATERIAL TO BESHAPED RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIALCONTAINING PLASTICS 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:	PURPOSE:To improve rigidity, low temperature strength, etc. by containing isotactic homopolypropylene in a propylene copolymer layer and raising the optimum temperature for stretching up to the stretching to temperature of an ethylene vinyl alcohol copolymer layer. CONSTITUTION:A laminated parison composed of two layers of propylene polymer containing propylene-ethylene random copolymer with ethylene of 20mol% at most as the main component and an ethylene-vinylalcohol copolymeric layer interposed between the two layers is molded by multilayer hot extrusion. Then, this parison is adjusted to the prescribed stretching temperature and stretched in the direction of the tube axis. The parison after or during stretching is blow- molded to prepare a multilayer stretched plastic container. In this case 50wt% at maximum of isotactic homopolypropylene copolymer is contained in the propylene copolymer.