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US 9,808,983 B2Granted
Polymeric material for container
AssigneeBerry Plastics Corporation
InventorDavid Dezhou Sun
Life of this patent
Estimating the term…
Abstract
A vessel is configured to hold a product in an interior region formed in the vessel. The vessel includes an inner layer arranged to define the interior region and an outer layer. 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, a core-layer formulation, and an outer-layer formulation to form an inner parison, an outer parison, and a core parison configured to have a core-parison density different than each of an inner-parison density of the inner parison and an outer-parison density of the outer parison,
- aligning the inner parison, the core parison, and the outer parison to cause the core parison to be located between the inner parison and the outer parison to cause the core parison to surround the inner parison and to be surrounded by the outer parison to 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 outer parison engages 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.