Method of making a rotatable molding element for selectively ape

Details Method of making a rotatable molding element for selectively ape Method of making a rotatable molding element for selectively ape

1985-04-11

1987-02-24

Wityshyn, Michael

Metal working

Means to assemble or disassemble

Puller or pusher means, contained force multiplying operator

291213, 156215, 425290, 425291, B21H 118, B32B 3104

Patent

active

046446230

ABSTRACT:
An apparatus for the manufacture of selectively apertured thermoplastic sheet or film, comprising a rotatable molding element means for receiving the film and which means has a predetermined pattern therein wherein as the film is contacted with the rotatable molding element means and a fluid pressure differential is applied to the surface of the film, a desired pattern of perforated areas and non-perforated areas are imparted to the film with each of said areas being continuous across the web of the film and alternating in the machine direction.

REFERENCES:
patent: 3811983 (1974-05-01), Rowland
patent: 4252561 (1981-02-01), Raley et al.
patent: 4395215 (1983-07-01), Bishop

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