Longitudinal orientation of a tubular thermoplastic film

Details Longitudinal orientation of a tubular thermoplastic film Longitudinal orientation of a tubular thermoplastic film

2002-10-14

2010-11-16

Huson, Monica A (Department: 1791)

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Production of continuous or running length

C264S571000, C264S210500, C425S377000, C425S388000

Reexamination Certificate

active

07833468

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.

REFERENCES:
patent: 4551380 (1985-11-01), Schoenberg
patent: 4938903 (1990-07-01), Schaeffer et al.
patent: 5951943 (1999-09-01), Auf Der Heide et al.

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