Method and apparatus for the production of perforated films, par

Details Method and apparatus for the production of perforated films, par Method and apparatus for the production of perforated films, par

1987-05-07

1989-02-21

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Formation of solid particulate material directly from molten...

264154, 264322, 425290, 425294, 425DIG37, 425503, B26F 126, B26F 306, B29C 5906

Patent

active

048063037

ABSTRACT:
A softened unperforated film and a perforated die which is generally cylindrical in movement are brought into contact and exposed, in a predetermined region, to a pressure gradient oriented radially of the die. The pressure gradient causes the local penetration of the film into the holes of the die and the consequent perforation of the film itself. The movement of the die is supported in a rigid manner solely upstream and downstream of the predetermined region in the common direction of movement of the film and the die. The die itself is subjected to a pulling action, along its generatrices at least close to the predetermined region.

REFERENCES:
patent: 3012918 (1961-12-01), Schaar
patent: 3054148 (1962-09-01), Zimmerli
patent: 3092439 (1963-06-01), Harrison
patent: 3394211 (1968-07-01), MacDuff
patent: 3549858 (1970-12-01), Larive et al.
patent: 3560601 (1971-02-01), Johnson et al.
patent: 3707102 (1972-12-01), Huppenthal et al.
patent: 3718059 (1973-02-01), Clayton
patent: 4151240 (1979-04-01), Lucas et al.
patent: 4248822 (1981-02-01), Schmidt
patent: 4280978 (1981-07-01), Dannheim et al.
patent: 4317792 (1982-03-01), Raley et al.

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