Method for the extrusion of tubular thermoplastic film

Details Method for the extrusion of tubular thermoplastic film Method for the extrusion of tubular thermoplastic film

1974-05-06

1976-08-24

Thurlow, Jeffery R.

Plastic and nonmetallic article shaping or treating: processes

Reactive gas or vapor treatment of work

Work is organic material

264 95, 264209, 264237, 425326R, 425387R, B29D 722

Patent

active

039767329

ABSTRACT:
The present invention relates to a method for the extrusion of tubular 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 semimolten condition, passing the tube through an extrusion cooling and shaping means having a plurality of multi-perforated air rings shaped in congruance to the desired shape of the inflating tube. This method allows increased production speeds and minimized gauge variation while maintaining bubble stability.

REFERENCES:
patent: 2987767 (1961-06-01), Berry et al.
patent: 3167814 (1965-02-01), Corbett
patent: 3307218 (1967-03-01), Reifenhauser
patent: 3507006 (1970-04-01), Princen
patent: 3551540 (1970-12-01), Pellicciari et al.
patent: 3568252 (1971-03-01), Masuda et al.
patent: 3775523 (1973-11-01), Haley
patent: 3819790 (1974-06-01), North et al.

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