Apparatus for reproducing perforated seamless tubular films by m

Details Apparatus for reproducing perforated seamless tubular films by m Apparatus for reproducing perforated seamless tubular films by m

1973-10-02

1976-03-30

Annear, R. Spencer

Plastic article or earthenware shaping or treating: apparatus

Shaping orifice and downstream work contacting gaseous...

264 94, 425290, 425326R, 425380, 425387R, 425467, 264154, B29C 2400

Patent

active

039471748

ABSTRACT:
Apparatus is provided for preparing perforated seamless tubular films of preferably thermoplastic material by passing an extruded tubular film over a perforated wall of a chamber connected to a constant pressure compressed air source.
In the apparatus compressed air from the chamber is allowed to pass periodically out of a first series of openings in the perforated wall, the openings being periodically closed either by axially displacing a plate to block said openings, or by rotating a subadjacent chamber itself provided with a second series of openings, whereby said first and second series of openings are periodically aligned.

REFERENCES:
patent: 2834983 (1958-05-01), Norton
patent: 3038198 (1962-06-01), Schaar
patent: 3372920 (1968-03-01), Corbett et al.
patent: 3841815 (1974-10-01), Labarre

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