Formation of a curl in a unitary closable container
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United States of America Patent
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Mar 17, 2009
Grant Date -
Oct 16, 2008
app pub date -
Apr 7, 2008
filing date -
Jan 16, 2007
priority date (Note) -
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status (Latency Note)
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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. Also, a die curler is disclosed that has an eccentric motion that forms a curl in a single progressive curling process.
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