Method of manufacturing sheet for food containers

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United States of America Patent

PATENT NO 8470224
APP PUB NO 20110221097A1
SERIAL NO

13042786

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ATTORNEY / AGENT: (SPONSORED)

Importance

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Abstract

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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; andextruding the recovered PET from the extruder into sheet.

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Patent Owner(s)

Patent OwnerAddress
NAKAMOTO PACKS CO LTDJAPAN OSAKA

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Konishi, Reiichi Osaka, JP 1 3
Sasauchi, Katsuro Osaka, JP 4 13

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