Plastic article or earthenware shaping or treating: apparatus – Preform severing means – Severing means is perforator
Patent
1996-06-14
1998-02-17
Davis, Robert
Plastic article or earthenware shaping or treating: apparatus
Preform severing means
Severing means is perforator
264504, 425388, B29C 5110, B29C 5122
Patent
active
057189285
ABSTRACT:
A cylindrical screen for perforating a thermoplastic film or sheets has an outer surface and an inner surface. A plurality of outer apertures extend from the outer surface and terminate at a corresponding inner aperture on the inner surface of the screen. The apertures in the outer surface can have the same or a different geometrical shape as the apertures in the inner surface. The apertures form a passageway through the screen. The passageways are disposed at least one angle from about 5.degree. to about 60.degree. with respect to a plane that is disposed substantially perpendicular to the outer surface of the screen to prevent a direct line of sight through the screen.
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Davis Robert
Tredegar Industries Inc.
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