Apparatus for the extrusion of tubular thermo-plastic film

Details Apparatus for the extrusion of tubular thermo-plastic film Apparatus for the extrusion of tubular thermo-plastic film

1975-12-15

1977-05-10

Spicer, Jr., Robert L.

Plastic article or earthenware shaping or treating: apparatus

Shaping orifice and downstream work contacting gaseous...

264 89, 264 95, 264209, 425326R, B29D 2304

Patent

active

040225585

ABSTRACT:
The present invention relates to a method and apparatus 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: 3280429 (1966-10-01), Haley
patent: 3427375 (1969-02-01), Turner
patent: 3507006 (1970-04-01), Princen
patent: 3551540 (1970-12-01), Pellicciari et al.
patent: 3568252 (1971-03-01), Masuda et al.
patent: 3668288 (1972-06-01), Takahashi
patent: 3775523 (1973-11-01), Haley
patent: 3819790 (1974-06-01), North et al.

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