MOLDING METHOD FOR POLYESTER RESIN

PURPOSE:To obtain polyester resin containing small acetaldehyde content without problem of sanitation by a simple method by regulating water content of the resin containing ethylene terephthalate unit as a main ingredient to a specific value, and melting, molding it. CONSTITUTION:In order to melt an...

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Bibliographische Detailangaben
Hauptverfasser:	TANAKA KATSUJI, AKAO SHIGERU, NAKAMURA TAKASHI
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 MAKING GRANULES OR PREFORMS METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS 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 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:	PURPOSE:To obtain polyester resin containing small acetaldehyde content without problem of sanitation by a simple method by regulating water content of the resin containing ethylene terephthalate unit as a main ingredient to a specific value, and melting, molding it. CONSTITUTION:In order to melt and mold polyester resin containing ethylene terephthalate unit as a main ingredient, water content of the resin is regulated to 60-500ppm, and the resin is melted and molded. A water content regulating method is executed by an apparatus having a moisture meter in the step of drying before melting and molding, and drying is finished when predetermined water content is obtained. As another method, there are a method having the steps of once lowering water content in polymer to 50ppm or less, then regulating its moisture and regulating the content. Drying is executed by various dryer. A moisture absorbing method is executed by a method for absorbing moisture in a constant-temperature and constant-moisture machine or a constant- temperature and constant-moisture chamber or a method having the steps of adding moisture to resin to be mixed and absorbing it in a chip.