The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 28, 1989
Filed:
Apr. 27, 1988
Prakash R Ajmera, Toledo, OH (US);
Owens-Illinois Plastic Products Inc., Toledo, OH (US);
Abstract
A method and apparatus for making a partially crystalline, biaxially oriented heat set hollow plastic container from a hollow parison having an open end and a closed end including engaging the open end of a plastic parison which is at a temperature within its molecular orientation temperature range, enclosing the hot parison in a hot mold, which is at heat setting temperature, expanding the plastic parison within the hot mold by internal pressurization to induce biaxial orientation of the plastic parison and to induce partial crystallization in the biaxially oriented container, exhausting the blow molding fluid while continuously introducing a cooling fluid such as liquid carbon dioxide into the biaxially oriented container and continuously removing the cooling fluid while the hot mold is closed for a period of time, opening the hot mold while continuing to introduce, circulate and remove coolant fluid for a predetermined period of time until the container is cooled sufficiently to prevent significant shrinkage and finally releasing the container.