Reform rollers
AssigneeCrown Packaging Technology, Inc.
InventorPaul Claydon
Life of this patent
Estimating the term…
Abstract
Reform rollers for use in internal or external base reforming of can bodies have a textured surface which control the depth of the dome of the can base and provide greater process stability than is achieved with known smooth rollers. One example of textured surface finish provided by spark erosion has been shown to have much greater consistency of dome reversal pressure, dome growth and dome depth.
Claims12
An apparatus for reforming the base of a can body, the can body having a substantially cylindrical side wall and an integral base, and the base including an outer annular wall, a support portion, an inner wall and a central dome, the apparatus comprising:
- one or more reform rollers;
- an actuator for moving the or each roller from a first position adjacent the base of the can to a second position in which the roller contacts either the outer annular wall or the inner wall of the can base in order to reform at least the inner wall of the can base;
- and in which the or each reform roller has a textured surface.
A method of reforming the base of a can body, the can body having a substantially cylindrical side wall and an integral base, and the base including an outer annular wall, a support portion, an inner wall and a central dome, the method comprising:
- moving one or more reform rollers from a first position adjacent the base of the can to a second position in which the or each roller contacts either the outer annular wall or the inner wall of the can base in order to reform at least the inner wall of the can base;
- and
- controlling the depth of the dome by using reform rollers which have a textured surface.
Dependencies are inferred from the claim text.