Title:
INFLATION MOLDING METHOD
Document Type and Number:
Japanese Patent JP3585589
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To stably produce a tubular film of high quality at a high speed over a long time by bringing the inner surface of a molten resin into contact with an inner diameter equalizing device during a period when the molten resin reaches an expansion start point to form the tubular film.
SOLUTION: Cooling devices 5,7 and devices 6-1, 6-2, 6-3 uniformizing the inner diameter of a molten resin are provided to an inflation molding apparatus. As the cooling devices 7, air ring devices are used and water is used in the cooling device 5 as a cooling medium and air is used in the air ring cooling device 7 as a cooling medium. The air ring cooling device 7 is arranged so that the air blown out of the device 7 impinges against the molten resin between the inner diameter uniformizing devices 6-1-6-3. Only the cooling device 7 is opperated to perform usual upward blow inflation molding and, subsequently, the cooling device 5 is operated to form an expansion start point position 2 above a die 1. The inner diameter uniformizing devices 6-1-6-3 are arranged between the expansion start point position and the die 1.
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Inventors:
Naoji Yoshii
Yoichi Wada
Yoichi Wada
Application Number:
JP20547795A
Publication Date:
November 04, 2004
Filing Date:
August 11, 1995
Export Citation:
Assignee:
Asahi Kasei Chemicals Corporation
International Classes:
B29C48/32; B29C48/10; B29C48/90; B29C55/28; B29K23/00; B29K101/12; B29L23/00; (IPC1-7): B29C55/28; B29C47/20; B29C47/78
Domestic Patent References:
| JP60024520U | ||||
| JP1306221A | ||||
| JP4279316A | ||||
| JP55154126A | ||||
| JP61286116A | ||||
| JP62149417A | ||||
| JP8057952A | ||||
| JP4257419A |
Attorney, Agent or Firm:
Yoshio Narui
Takeshi Shimizu
Joi Ito
Hideo Takei
Takeshi Shimizu
Joi Ito
Hideo Takei