Multi-layer tube and process of making the same
AssigneeBerry Plastics Corporation
InventorsDavid Dezhou Sun, Philip A. Driskill, Jeffrey C. Minnette, Birju A. Surti, Jonathan K. Williams
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 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.
Claims20
A method of producing a multiple layer tube, the method comprising the steps of
- extruding an inner-layer formulation to form an inner parison,
- extruding a core-layer formulation to form a core parison,
- extruding an outer-layer formulation to form an 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 an extruded multiple layer tube,
- wherein the multiple layer tube has a density of about 0.3 g/cm3 to 0.8 g/cm3,
- wherein the core-layer formulation comprises one or more high density polyethylene base resins (HDPE), and
- wherein the core-layer formulation comprises a chemical nucleating agent, a physical nucleating agent, and a physical blowing agent.
A method of producing a multiple layer tube, the method comprising the steps of
- extruding an inner-layer formulation to form an inner parison,
- extruding a core-layer formulation to form a core parison,
- aligning the inner parison and the core parison to cause the core parison the core parison to surround the inner parison and form an extruded multiple layer tube,
- wherein the multiple layer tube has a density of about 0.3 g/cm3 to 0.8 g/cm3,
- wherein the core-layer formulation comprises one or more high density polyethylene base resins (HDPE), and
- wherein the core-layer formulation comprises a chemical nucleating agent, a physical nucleating agent, and a physical blowing agent.
A method of producing a multiple layer tube, the method comprising the steps of
- extruding a core-layer formulation to form a core parison,
- extruding an outer-layer formulation to form an outer parison,
- aligning the core parison and the outer parison to cause the core parison to be surrounded by the outer parison to form an extruded multiple layer tube,
- wherein the multiple layer tube has a density of about 0.3 g/cm3 to 0.8 g/cm3,
- wherein the core-layer formulation comprises one or more high density polyethylene base resins (HDPE), and
- wherein the core-layer formulation comprises a chemical nucleating agent, a physical nucleating agent, and a physical blowing agent.
Dependencies are inferred from the claim text.