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US 2017/0239874 A1Published application
Polymeric material for container
AssigneeBerry Plastics Corporation
InventorDavid Dezhou SUN
Life of this patent
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Abstract
A vessel is configured to hold a product in an interior region formed in the vessel. The vessel is formed using a blow-molding process in which a multiple layer parison is blow molded to form the vessel. The multiple layer parison is formed in an extrusion process in which a number of extruders are arranged to co-extrude associated inner and outer parisons to establish the multiple layer parison.
Claims22
A method of producing a multilayer vessel, the method comprising the steps of
- extruding an inner-layer formulation and a core-layer formulation to form an inner parison and a core parison configured to have a core-parison density different than an inner-parison density of the inner parison,
- aligning the inner parison and the core parison to cause the core parison to surround the inner parison and form a multilayer tube,
- placing the multilayer tube in a mold cavity formed in a mold, and
- expanding the multilayer tube to cause the multilayer tube to deform so that the core parison moves toward an inner surface of the mold and a multilayer vessel having an interior region formed therein is provided and to transform the core parison into a core layer having a core-layer density,
- wherein a ratio of the core-layer density of the multilayer vessel to the core-parison density of the multilayer tube is in a range of about 1 to about 2.
2 more elements
Dependencies are inferred from the claim text.