Stock material or miscellaneous articles – All metal or with adjacent metals – Having aperture or cut
Patent
1983-09-21
1985-09-24
Henderson, Christopher A.
Stock material or miscellaneous articles
All metal or with adjacent metals
Having aperture or cut
428613, 291635CW, 29523, B22B 100
Patent
active
045432996
ABSTRACT:
A laminated, cylindrical, metal screen or molding element for vacuum perforation of plastic film or sheets, comprising two or more relatively thin cylindrical metal screens, each having a predetermined inside and outside diameter and each having a plurality of openings or holes therein of a predetermined size and geometrical shape, and said relatively thin screens stacked and bonded together, diametrically one inside the other thereby providing a screen of a desired thickness and a desired hole geometry wherein the holes in the screen have substantially straight walls perpendicular to the surface of the screen.
A method of producing a relatively thick cylindrical metal screen for vacuum perforation of plastic film or sheets wherein the holes or openings in the screen have substantially straight walls perpendicular to the surface of the screen, comprising stacking and bonding together two or more matched relatively thin metal screens diametrically one inside the other.
REFERENCES:
patent: 3747770 (1973-07-01), Zentis
patent: 3750889 (1973-08-01), Acosta
patent: 4072787 (1978-02-01), Ricks
Raley Garland E.
Spear Dean M.
Ethyl Corporation
Henderson Christopher A.
Johnson Donald L.
Leonard Paul H.
Sieberth John F.
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