Title:
PROCESS FOR PRODUCT OF POROUS FILM HAVING HIGH BURSTING STRENGTH
Document Type and Number:
Japanese Patent JP3678758
Kind Code:
B2
Abstract:
PURPOSE: To improve bursting strength of a film by applying a prescribed pressure onto a position to be decorated in manufacturing a porous film by obtaining a solventless film with initial porosity and then stretching the film by biaxial stretching.
CONSTITUTION: A film is formed by extruding decalin solution of polyethene and the film is cooled down to a temperature lower than gelling point. After that, decalin is removed from the film by evaporation to form a solventless film with initial porosity. The solventless film is biaxially stretched to manufacture a porous film. In such manufacturing method, 1-25 MPa of pressure is applied under a temperature lower than the melting point of polyethene onto a position to be decorated to apply a recessed line pattern onto the unstretched solventless film. Thus the tensile strength of the film is remarkably increased to improve the bursting strength of the film.
Inventors:
Henrix Mateus Fortuin
Hertada Pascal Petronella Freis Heuer-Nerissen
Hertada Pascal Petronella Freis Heuer-Nerissen
Application Number:
JP34611792A
Publication Date:
August 03, 2005
Filing Date:
December 25, 1992
Export Citation:
Assignee:
DSM NEAMLOZE VENNOOTSHAP
International Classes:
B01D67/00; B01D71/26; B29C39/02; B29C55/00; B29C55/12; B29C59/02; B29D7/01; C08J9/28; B29K105/04; B29L31/14; (IPC1-7): C08J9/28; B01D71/26; B29C55/12; B29C59/02
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Attorney, Agent or Firm:
Aoyama Aoi
Mitsuo Tanaka
Mitsuo Tanaka