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US 4,364,896 AGranted
Method for making a multi-layered blown plastic container
AssigneeOwens-Illinois, Inc.
InventorRobert F. Kontz
Life of this patent
Estimating the term…
Abstract
A multi-layered blown plastic container is formed by injection molding a first thermoplastic parison, axially stretching the first parison at its orientation temperature, injection molding a second thermoplastic parison around the first parison, and blowing the multi-layered parison at its orientation temperature to provide an oriented container, the inner layer being oriented in the axial and hoop directions, and the outer layer oriented in the hoop direction.
Claims11
A method of making a hollow blown plastic container comprising the steps of:
- A. injection molding a first parison of thermoplastic material,
- B. bringing the temperature of the first parison to its orientation temperature and axially stretching the parison,
- C. injection molding at least a second thermoplastic parison around the stretched first parison to form a multi-layered parison,
- D. bringing the multi-layered parison to orientation temperature, and
- E. blowing the multi-layered parison at the orientation temperature of Step D to form a multi-layered oriented hollow plastic container in which the inner layer is oriented in the axial direction and the hoop direction and the outer layer is oriented in the hoop direction.
2 more elements
Dependencies are inferred from the claim text.