FORMING METHOD OF INFLATION FILM AND DEVICE THEREOF

Title:

FORMING METHOD OF INFLATION FILM AND DEVICE THEREOF

Document Type and Number:

Japanese Patent JP3510900

Kind Code:

B2

Abstract:

PURPOSE: To produce film excellent in optical characteristics (or haze, gloss and clarity) at high speed by a method wherein molten resin bubble is stabilized by bringing thermoplastic resin having small melt tension to long neck type form.
CONSTITUTION: In the forming method of inflation film and the device suitable therefor, molten resin bubble 3 is noncontactingly held on the surface of a stabilizer 4 through air layer and, in addition, the temperature of the bubble 3 at the outlet of an air ring 5, which is provided at the expansion point of the bubble, is controlled so as to lie within the temperature domain ranging from the crystallization temperature of thermoplastic resin to the temperature, which is higher than the crystallization temperature by 60°C.

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Inventors:

Kotani, Terumitsu
Taka, Toshio
Hatano, Hisashi
Onoda, Takeshi
Kobayashi, Tomoaki

Application Number:

JP21640792A

Publication Date:

March 29, 2004

Filing Date:

July 22, 1992

Export Citation:

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Assignee:

SHOWA DENKO KK

International Classes:

B29C55/28; B29C48/32; B29K23/00; B29L7/00; (IPC1-7): B29C55/28; B29C47/20

Attorney, Agent or Firm:

菊地精一

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