Method of manufacturing sheet for food containers

This invention relates to a method of manufacturing sheet for food containers, which comprises: adding a chain extender to moist flakes of recovered PET; charging the flakes of recovered PET containing the chain extender into an extruder having two or more vent holes, melting and kneading the flakes...

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Bibliographische Detailangaben
Hauptverfasser:	KONISHI, REIICHI, SASAUCHI, KATSURO
Format:	Patent
Sprache:	eng ; fre ; ger
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 MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS 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:	This invention relates to a method of manufacturing sheet for food containers, which comprises: adding a chain extender to moist flakes of recovered PET; charging the flakes of recovered PET containing the chain extender into an extruder having two or more vent holes, melting and kneading the flakes of recovered PET with sucking to degas through the vent holes, while molecular chains of the recovered PET of which the molecular weight has been lowered are bonded to each other by the chain extender to render the molecular weight higher, and simultaneously, ethylene glycol and acetaldehyde, produced during depolymerization by water and heat, are trapped by the chain extender to remove residual aldehydes; and extruding the recovered PET from the extruder into sheet.