Cooling apparatus for tubular plastics film extruded from a film

Details Cooling apparatus for tubular plastics film extruded from a film Cooling apparatus for tubular plastics film extruded from a film

1984-09-28

1986-07-22

Hoag, Willard E.

Plastic article or earthenware shaping or treating: apparatus

Shaping orifice and downstream work contacting gaseous...

4253261, B29C 5528, B29C 4788

Patent

active

046016490

ABSTRACT:
Cooling apparatus for tubular plastics film extruded from a film blow head includes an outer cooling ring which surrounds the extruded tubular film and defines an annular nozzle gap with a blowing direction substantially parallel to the wall of the tubular film. Near the end of a cooling section formed by an inner cooling ring beneath the inflated region of tubular film, there is an apertured baffle plate or diaphragm of which the axial projection onto the film bubble covers at least its interior inflated region and, together with the wall of the tubular film, bounds an annular gap.

REFERENCES:
patent: 3456044 (1969-07-01), Pahlke
patent: 3852392 (1974-12-01), Davis et al.
patent: 3898028 (1975-08-01), Upmeier
patent: 3902832 (1975-09-01), Gregory et al.
patent: 4019843 (1977-04-01), Zimmerman
patent: 4080143 (1978-03-01), Upmeier
patent: 4105380 (1978-08-01), Zimmerman
patent: 4243363 (1981-01-01), Mulcahy
patent: 4402656 (1983-09-01), Schott
patent: 4473527 (1984-09-01), Fujisaki et al.

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