Apparatus for extruding tubular thermoplastic film

Details Apparatus for extruding tubular thermoplastic film Apparatus for extruding tubular thermoplastic film

1978-07-20

1979-11-20

Hoag, W. E.

Plastic article or earthenware shaping or treating: apparatus

Shaping orifice and downstream work contacting gaseous...

264557, 264564, 264569, 4253261, 4253871, 425388, 425503, 425504, 425461, B29F 308, B29D 2304

Patent

active

041749324

ABSTRACT:
Apparatus is provided for preparing continuous, seamless blown thermoplastic film tubing by extruding a melt of the thermoplastic through an annular orifice into a tubular shape, inflating the film tube thus formed and cooling such inflated tubing. In the apparatus, the extruded tube while still plastic is passed through an external cooling means having one or more multi-perforated air rings shaped in congruance to the desired shape of the inflating tube. Additionally, final cooling means is provided which cools the precooled film tube with air supplied from a continuous, non interrupted annulus surrounding the tube. A major advantage of this apparatus is that production speeds can be increased while maintaining bubble stability.

REFERENCES:
patent: 3568252 (1971-03-01), Masuda et al.
patent: 3668288 (1972-06-01), Takahashi
patent: 3867083 (1975-02-01), Herrington
patent: 3887673 (1975-06-01), Sato et al.

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