Title:
チューブ状熱可塑性フィルムの縦方向延伸
Document Type and Number:
Japanese Patent JP4420438
Kind Code:
B2
Abstract:
The improved method and apparatus for longitudinal orientation of a tubular thermoplastic film as it leaves an annular extrusion die aims at a better control of this orientation. On its travel between the exit orifice (21) and the draw-down means, the at least partly molten film passes an annular frictional device (101), and the frictional force set-up hereby is variable in controlled manner. This device is cooled from its interior (105) in controlled manner by means of a fluid cooling medium. The friction may be controlled by airlubrication with air pressed through holes (123) in the frictional device or through microporous metal, (102) or alternatively by sucking the film against the frictional device. In a preferred embodiment the extrusion out of the die is peripherical extrusion, and in another preferred embodiment the film contains a blend of at least two compatible or compatibilized polymers, and the main proportion of the orientation takes place while one is predominantly in a crystalline state and the other predominantly in a molten state.
Inventors:
Rasmussen Ole-Vent
Application Number:
JP2003536013A
Publication Date:
February 24, 2010
Filing Date:
October 14, 2002
Export Citation:
Assignee:
Rasmussen Ole-Vent
International Classes:
B29C48/10; B29C48/32; B29C48/325; B29C48/34; B29C48/90; B29C48/92; B29C48/94; B29C55/28; B29L7/00
Domestic Patent References:
| JP55093425A | ||||
| JP11028764A | ||||
| JP6064039A | ||||
| JP11115047A |
Attorney, Agent or Firm:
Mitsufumi Esaki
Tsuneo Mihara
Okumura Yoshimichi
Blacksmith
Tsuneo Mihara
Okumura Yoshimichi
Blacksmith