Process for extruding a thermoplastic sheath in the form of a tu

Details Process for extruding a thermoplastic sheath in the form of a tu Process for extruding a thermoplastic sheath in the form of a tu

1979-12-28

1981-12-01

Thurlow, Jeffery R.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Perforation by differential fluid pressure; or smoothing,...

264565, 264566, 264DIG70, 425 72R, 425290, 4253261, 425380, 425381, 4253871, 425DIG37, B29C 2400

Patent

active

043036090

ABSTRACT:
The present invention relates to a process for extruding a thermoplastic sheath in the form of a tubular film provided with perforations and to a device for carrying out the process, according to which the extruded film passes over a skirt through which are blown jets of hot air provoking the perforation and formation of openings in the film; in the areas where the film is not to be perforated, air jets are also blown through channels of smaller width, therefore with a reduced pressure, so that the jets do not provoke the perforation of the film but form an air-cushion facilitating the flow of the film on the skirt; the channels are supplied from a pneumatic chamber with interposition of a rotary distributor formed by a ring made of graphite or self-lubricating material. The invention is applicable to the manufacture of partially perforated tubular films with a view to making packings.

REFERENCES:
patent: 2834983 (1958-05-01), Norton
patent: 3038198 (1962-06-01), Schaar
patent: 3054148 (1962-09-01), Zimmerli
patent: 3583034 (1971-06-01), Colombo
patent: 3810725 (1974-05-01), Trub et al.
patent: 3841815 (1974-10-01), Labarre
patent: 3947174 (1976-03-01), Hureau et al.
patent: 4038008 (1977-07-01), Larsen

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