Method for extruding tubular thermoplastic film

Details Method for extruding tubular thermoplastic film Method for extruding tubular thermoplastic film

1974-08-14

1976-05-25

Thurlow, Jeffery R.

Plastic and nonmetallic article shaping or treating: processes

Reactive gas or vapor treatment of work

Work is organic material

264 95, 264290R, B29D 722

Patent

active

039594254

ABSTRACT:
A method is provided for preparing continuous, seamless blown thermoplastic film tubing by extruding a melt of the thermoplastic through an annular orifice into an instantaneous cylindrical shape, inflating the film tube thus formed and cooling such inflated tubing. In the process, the extruded tube while still plastic is passed through an external cooling and shaping means having a multi-perforated air ring shaped in congruance to the desired shape of the inflating tube. A major advantage of this process is that production speeds can be increased while maintaining bubble stability.

REFERENCES:
patent: 3167814 (1965-02-01), Corbett
patent: 3507006 (1970-04-01), Princen
patent: 3551540 (1970-12-01), Pellicciari et al.
patent: 3568252 (1971-03-01), Masuda et al.
patent: 3754067 (1973-08-01), St. Eve et al.
patent: 3775523 (1973-11-01), Haley
patent: 3819790 (1974-06-01), North et al.
patent: 3835209 (1974-09-01), Karabedian

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