Method of forming a composite closure
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United States of America Patent
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Mar 22, 2016
Grant Date -
Feb 7, 2013
app pub date -
Feb 25, 2011
filing date -
Feb 26, 2010
priority date (Note) -
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status (Latency Note)
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Abstract
A method of manufacturing a composite closure, including an outer closure cap and an inner sealing liner, comprises providing a closure cap having an annular skirt portion including an annular lip that defines an annular recess adjacent a top wall portion of the cap. Molten plastic is compression molded within the closure cap to form the inner sealing liner adjacent the top wall portion, with the periphery of the sealing liner positioned within the annular recess of the closure cap. A plurality of circumferentially spaced gussets are provided within the annular recess for controlling the flow of the molten plastic during liner formation, thereby facilitating the venting of air to abate formation of voids in the sealing liner.
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