Stabilizing air ring apparatus

Details Stabilizing air ring apparatus Stabilizing air ring apparatus

1981-07-20

1983-10-11

Thurlow, Jeffery R.

Plastic article or earthenware shaping or treating: apparatus

Shaping orifice and downstream work contacting gaseous...

264566, 264569, 4253261, 425384, 425392, 425445, B29D 722

Patent

active

044089708

ABSTRACT:
The present invention relates to a method and apparatus for the extrusion of thermoplastic film which comprises extruding a melt of thermoplastic through an annular orifice to form a bubble or tube and while the tube is still in a semi-molten condition, passing the tube through a cooling and stabilizing means which surrounds the tube and is characterized by having a variable diameter to accommodate varying sizes of tubing.

REFERENCES:
patent: 3218380 (1965-11-01), Euling et al.
patent: 3555604 (1971-01-01), Pahlke
patent: 3852392 (1974-12-01), Davis et al.
patent: 3930781 (1976-01-01), Upmeier
patent: 3950466 (1976-04-01), Hasler
patent: 3958913 (1976-05-01), Stangl
patent: 3980418 (1976-09-01), Schott, Jr.
patent: 4189288 (1980-02-01), Halter

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