Title:
PRODUCTION OF AIR PERMEABLE FILM
Document Type and Number:
Japanese Patent JP2000086790
Kind Code:
A
Abstract:
To provide a method for producing air permeable film having uniform air permeability over whole width.
In this method for producing an air permeable film of an olefin resin composition containing filler, a film is oriented in such conditions as to have the difference of temperature so that the surface temperature of sheet end in uniaxial orientation becomes higher, preferably by ≥5°C than the surface temperature in sheet center part and does not become higher than the melting point.
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Inventors:
ENOGUCHI MASAJI
Application Number:
JP25856898A
Publication Date:
March 28, 2000
Filing Date:
September 11, 1998
Export Citation:
Assignee:
TOKUYAMA CORP
International Classes:
A61F13/15; A61F13/49; A61F13/511; B01D53/22; B01D71/26; B29C55/02; C08J9/00; H01M2/16; B29K23/00; B29K105/04; B29L7/00; B29L31/14; B29L31/34; B29L31/48; (IPC1-7): C08J9/00; A61F13/15; B01D53/22; B01D71/26; H01M2/16