Heat-seal failure prevention apparatus
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United States of America Patent
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Mar 14, 2017
Grant Date -
Nov 27, 2014
app pub date -
Aug 8, 2014
filing date -
Nov 24, 2010
priority date (Note) -
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Abstract
A co-injected molded multi-layer article has inner and outer layers, an interior layer contained within the inner and outer layers and a surface portion to which a closure or other component may be heat-sealed. The article is molded by co-injecting the inner, outer and interior layer materials into a mold cavity of a mold. The interior layer material is caused to flow along a steam line offset from the zero velocity gradient of the combined material flow and biased toward a material flow for forming an outer wall of the multi-layer article. The resultant molded multi-layer article contains an interior layer located in a heat sealable region that avoids a breach or failure during a heat seal operation to seal an opening of the molded article.
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