Printing cylinder with an outside covering and a method and apparatus for applying a covering on a cylinder surface
AssigneeStork Screens B.V.
InventorHendricus H. van der Velden
Life of this patent
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Abstract
Printing cylinder with an outside covering of a thermoplastic elastomeric composition which can be hardened by exposure to light, the covering being snugly applied to the circumference of the cylinder by suction in the annular clearance between cylinder and covering; the cylinder comprising several coaxial parts during the covering process, only the central portion with its covering forming the printing cylinder.
Claims3
A method for forming a printing cylinder comprising the steps of completely covering the outer surface of a cylinder with a closely fitting layer of a thermoplastic elastomeric composition adapted to be hardened by exposure to light, maintaining a space between said cylinder and said layer by the provision of a pattern of interconnected cavities or channels on said outer surface of said cylinder, enveloping the outer side of the layer with a flexible film of gas-tight material after application of the layer, applying a vacuum to said space for removing any accumulated gases, and thereafter heating said cylinder and said covered layer for 10 to 120 min. at a temperature of 100.degree. to 150.degree. C., while maintaining the vacuum, thereafter removing the application of vacuum and the film, and further heating said cylinder and said covered layer for 10 to 60 min. at a temperature of 100.degree. to 150.degree. C.
Dependencies are inferred from the claim text.