Formation of a curl in a unitary closable container

Details Formation of a curl in a unitary closable container Formation of a curl in a unitary closable container

2011-05-17

2011-05-17

Sullivan, Debra M (Department: 3725)

Metal deforming

By use of tool acting during relative rotation between tool...

During rotation of work

C072S096000, C072S124000

Reexamination Certificate

active

07942028

ABSTRACT:
Disclosed is a device and method for forming a curl in a closable container. A process of forming a pre-curl is used, which is followed by a second separate step of forming the completed curl. The two-step process provides for higher tolerances with respect to the shape of the curl that allows the curl to be used as a sealing surface for a recloseable metal bottle. A three-step process provides for even greater tolerances and reduces longitudinal forces by completing the curl using lateral forces.

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