METHOD FOR REMOVING ADSORBED MATERIAL FROM POLYESTER BOTTLE

Japanese Patent JP3296629

B2

PURPOSE: To quickly remove an adsorbed material from a polyester bottle to enable the reuse of the bottle by keeping a polyester bottle having a bottle body part having a specific average crystallinity in an atmosphere of a specific temperature, thereby desorbing the material adsorbed on the bottle.
CONSTITUTION: A polyester resin (e.g. polyethylene terephthalate) is molded by an injection molding machine. The formed preform is heated to the surface temperature of 90-100°C at the middle of the preform body part and formed by a drawing blow molding with a molding machine to obtain a polyester bottle 1 having an average crystallinity of 32-70% at the body part 4 of the bottle. Methanol (or p-xylene) is poured into the bottle 1, left standing at 25°C for 7 days and discharged from the bottle. The bottle is washed with distilled water of 20°C and dried to effect the adsorption of methanol (or p-xylene) to the bottle and the bottle 1 is maintained in an atmosphere of 40-150°C for 4hr to quickly desorb and remove the material adsorbed on the polyester bottle 1.

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Hidenori Kaya
Koji Niimi

JP23052993A

July 02, 2002

September 16, 1993

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Mitsui Chemicals, Inc.

B09B5/00; B29B17/00; B65D1/02; C08J7/00; B08B7/00; C08J11/12; (IPC1-7): B29B17/00

JP5798315A
JP230512A
JP2209219A
JP562131A
JP4154536A
JP297212U

Shunichiro Suzuki

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