B - Operations – Transporting – 29 – D
Patent
B - Operations, Transporting
29
D
18/1057, 26/111
B29D 28/00 (2006.01) B21D 39/00 (2006.01) B23P 15/16 (2006.01) B23P 15/26 (2006.01) B26F 1/26 (2006.01)
Patent
CA 1243176
ABSTRACT SCREEN FABRICATION A laminated, cylindrical, metal screen or molding element for vacuum perforation of plastic film or sheets, comprising two or more relatively thin cylin- drical 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 thick- ness and a desired hole geometry wherein the holes in the screen have substantially straight walls perpen- dicular to the surface of the screen. A method of producing a relatively thick cylin- drical 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.
463185
Raley Garland E.
Spear Dean M.
Macrae & Co.
Tredegar Film Products Corporation
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