Film blowing head for extruding a tubular web of a thermoplastic

Details Film blowing head for extruding a tubular web of a thermoplastic Film blowing head for extruding a tubular web of a thermoplastic

1995-02-14

1996-04-09

Chiesa, Richard L.

Plastic article or earthenware shaping or treating: apparatus

Shaping orifice and downstream work contacting gaseous...

4253261, B29C 4720, B29C 4786

Patent

active

055056016

ABSTRACT:
A film blowing head for extruding a tubular web of a thermoplastic synthetic melt consists of at least one inner cooling ring and a pipe passing through the blowing head, wherein a central pipe is arranged with the formation of an annular space. The annular space is placed in an air conducting communication with the inner cooling ring. The cooling and supporting air is fed via lines into the annular space and is drawn off again through the central pipe. To permit cooling with very cold air, the pipe feeding the cooling air is surrounded, in the zone of the blowing head, by two concentric pipes with the formation of two annular spaces. The two annular spaces are connected with each other in the zone of the plane of the outlet nozzle gap of the blowing head by an overflow compartment that is closed towards the outside. Warm air is fed to one of the annular spaces, and is drawn off again through the other annular space.

REFERENCES:
patent: 3898028 (1975-08-01), Upmeier
patent: 3902832 (1975-09-01), Gregory et al.
patent: 3947170 (1976-03-01), Zimmermann
patent: 4105380 (1978-08-01), Zimmermann
patent: 4402656 (1983-09-01), Schott, Jr.
patent: 4606879 (1986-08-01), Cerisano
patent: 4627805 (1986-12-01), Schnell
patent: 4938903 (1990-07-01), Schaeffer et al.
patent: 5322431 (1994-06-01), Kahlen et al.

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