| 摘要 |
A method of forming a Ballard shell on a rotogravure printing roll or the like. At least one of the side surfaces of a roll base is covered with a removably fixed, adhering, concentric, annular disk which remains in place and limits the radial extent of plating on the side of the cylinder while a Ballard shell is plated on the roll. The disk is removable from the roll at the end of the process. The result of the process is a novel Ballard shell having a cleanly terminating inner circumference adjacent to the roll and a ledge portion on its inner periphery extending axially outward from the inner circumference. The axially extending ledge portion of the Ballard shell is a novel structural feature, and is responsible for the easy stripability of the shell after an extended printing run. Yet another aspect of the invention is a rotogravure roll or the like on which a Ballard shell having the previously described construction is formed. Still another aspect of the invention is an annular disk having a first major surface which can be made of polymeric magnetic material and a second major surface which can be made of electrically non-conductive polymeric material. In one specific embodiment, the disk can be opened to slip the disk over a shaft from the side and then rejoined to encircle the shaft.
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