Plastic article or earthenware shaping or treating: apparatus – With apparatus assembly or dismantling means or with idle part – For press shaping surface
Patent
1985-04-11
1987-01-13
Hoag, Willard E.
Plastic article or earthenware shaping or treating: apparatus
With apparatus assembly or dismantling means or with idle part
For press shaping surface
425290, 425363, 425388, 425403, B29C 5906
Patent
active
046361618
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.
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Kirk-Othmer, Ed. 3, vol. 16, Wiley, N.Y., Encyc. of Chem. Tech., pp. 72-86.
Raley Garland E.
Spear Dean M.
Ethyl Corporation
Hoag Willard E.
Johnson Donald L.
Leonard Paul H.
Sieberth John F.
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