Foil-blowing apparatus with improved cooling

Details Foil-blowing apparatus with improved cooling Foil-blowing apparatus with improved cooling

1987-07-13

1988-11-15

Chiesa, Richard L.

Plastic article or earthenware shaping or treating: apparatus

Shaping orifice and downstream work contacting gaseous...

2642092, 264569, 4253261, 4253871, B29C 4724, B29C 4788

Patent

active

047845902

ABSTRACT:
The apparatus for making a plastic foil by blowing into an extruded thermoplastic tube comprises a rotating extruder head with at least one circular outlet gap for the plastic tube, an air blowing device and a cooling device including two circular cooling air outlets surrounding the circular outlet gap of the extruder head. Cooling air duct structures are connected to a common cooling air blower. A cooling air distributor unit has a cooling air feed device for each cooling air outlet. The cooling air feed devices are aerodynamically independent of each other. The aerodynamically independent cooling air feed devices are connected to a common cooling air duct structure. Each cooling air feed device has an air flow control device.

REFERENCES:
patent: 3548042 (1970-12-01), Hinrichs
patent: 3568252 (1971-03-01), Masuda et al.
patent: 3947170 (1976-03-01), Zimmermann
patent: 4272231 (1981-06-01), Schott, Jr.
patent: 4330501 (1982-05-01), Jones et al.
patent: 4606879 (1986-08-01), Cerisano
patent: 4624823 (1986-11-01), Audureau et al.

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