B - Operations – Transporting – 21 – D
Patent
B - Operations, Transporting
21
D
101/71
B21D 3/08 (2006.01) B41F 13/10 (2006.01) B41N 6/02 (2006.01)
Patent
CA 1094880
ABSTRACT: A method of making a plate cylinder for a web printing press in which a hollow cylinder with a conical interior is formed of ductile steel alloy. Two nickel printing plates are formed to shape so that they will fit virtually exactly around the cylinder without joins between them being readily apparent. A cylindrical sould having two semi-cylindrical mould halves is formed with inner diameter equal to the outer diameter of to plate cylinder being produced. One mould half is placed with its semi-cylindrical inner surface facing upwards and a printing plate is placed inside. Then the hollow cylinder coated with epoxy resin is placed on this plate, and the other printing plate is placed on the cylinder. The second mould half is secured to the first half, and a conical core is forced into the cylinder to expand it radially so that the plates are held under pressure against the mould surface. Then the mould is heated end the resin allowed to set under conditions of temperature and pressure. Finally the plate cylinder is taken from the mould and the adhered printing plates are chromium plated.
302779
de La Rue Giori S.a.
Fetherstonhaugh & Co.
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