Heat-seal failure prevention method and article
AssigneeKortec, Inc.
InventorPaul M. Swenson
Life of this patent
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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.
Claims14
A method of molding a multi-layer article from a first polymeric material and a second polymeric material, the method comprising:
- injecting the first polymeric material into a mold cavity configured to form a resulting multi-layer article having an open end opposed to a closed end and a flange disposed at the open end with the flange including a heat sealable zone of the resulting multi-layer article;
- injecting the second polymeric material into the mold cavity to form an inner layer and an outer layer of the resulting multi-layer article;
- and
- positioning the first polymeric material in the heat sealable zone of the resulting multi-layer article to maintain integrity of a resulting interior layer of the resulting multi-layer article during a heat sealing operation by co-injecting the first polymeric material along a flow streamline offset from a zero velocity gradient of a combined flow of the first and second polymeric materials.
Dependencies are inferred from the claim text.