Blown film die enclosure

Details Blown film die enclosure Blown film die enclosure

1993-06-17

1994-11-29

Chiesa, Richard L.

Plastic article or earthenware shaping or treating: apparatus

Shaping orifice and downstream work contacting gaseous...

425 73, 4253261, B29C 4786

Patent

active

053684605

ABSTRACT:
An enclosure is disclosed for minimizing or eliminating the effect of uncontrolled air currents and temperature gradients on a blown film bubble emerging from the die of a blown film extruder. The enclosure includes a flexible, transparent shroud supported by a support frame in a substantially cylindrical shape, tapering down to a frusto-conical shape adjacent the extruder head. The lower edge of the shroud is releasably affixed to an annular platform mounted adjacent to the extruder head in coaxial alignment therewith. Sections of the annular platform and shroud support frame are hinged to enable easier access to the die and extruder head.

REFERENCES:
patent: 3008186 (1961-11-01), Voigt
patent: 3265789 (1966-08-01), Hofer
patent: 3600488 (1971-08-01), Yazawa
patent: 3663134 (1972-05-01), Coquelin
patent: 4717323 (1988-01-01), Karl et al.
patent: 4749346 (1988-06-01), Planeta
patent: 4818467 (1989-04-01), Audureau et al.

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