Plastic article or earthenware shaping or treating: apparatus – Shaping orifice and downstream work contacting gaseous...
Patent
1994-08-11
1995-11-07
Chiesa, Richard L.
Plastic article or earthenware shaping or treating: apparatus
Shaping orifice and downstream work contacting gaseous...
425192R, 4253261, B29C 4788
Patent
active
054643368
ABSTRACT:
An air ring for supplying cooling air to an extruded tubular plastic film after the film has been extruded from an annular extruder die at an elevated temperature. The air ring has a lower annular member securable to an annular extruder so as to surround extruded tubular plastic film as the film leaves the extruder die. The lower annular member having at least one passage therethrough for supplying cooling air from the exterior thereof to a lower portion of the tubular film. A first upper annular member surrounds an upper portion of the lower annular member in radially spaced relationship therewith, the first upper annular member projecting above the lower annular member and being detachably secured to the upper portion of the lower annular member by a removable spacer assembly, which provides circumferentially extending passages for the flow of cooling air from the ambient atmosphere between the lower annular member and the first upper annular member to the tubular film.
REFERENCES:
patent: 3819790 (1974-06-01), North et al.
patent: 4717323 (1988-01-01), Karl et al.
patent: 4818467 (1989-04-01), Audureau et al.
patent: 4826414 (1989-05-01), Planeta
patent: 4929162 (1990-05-01), Planeta
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