Barrier-coated tube of biaxially stretched thermoplastic material having a monoaxially stretched barrier coating thereon
Patent 4615925 Issued on October 7, 1986. Estimated Expiration Date: 
October 7, 2003. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
October 7, 2003. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesInjection blow molding process Multilayer container Process for rendering polyester hollow bodies gastight Process for the manufacturing of bioriented hollow bodies Preform of a thermoplastic Patent #: 4391861 InventorAssigneeApplicationNo. 06/487945 filed on 04/25/1983US Classes:428/36.6, Contains vapor or gas barrier, polymer derived from vinyl chloride or vinylidene chloride, or polymer containing a vinyl alcohol unit215/12.2, Coating or lamination428/542.8ARTICLE OF INTERMEDIATE SHAPE (E.G., BLANK, PARISON, PREFORM, ETC.)ExaminersPrimary: Kittle, John E.Attorney, Agent or FirmInternational ClassesB29C 31/00 (20060101)B29C 49/48 (20060101) B29C 55/00 (20060101) B29C 49/54 (20060101) B29C 59/04 (20060101) B29C 55/30 (20060101) B29C 49/08 (20060101) B29C 67/00 (20060101) B29C 49/14 (20060101) B29C 49/22 (20060101) B65D 1/02 (20060101) Foreign Application Priority Data1980-05-29 SEAbstractA method for providing a container with one or more layers of barrier material during the production of the container from a thermoplastic. A preform (10) is stretched in its axial direction, generally an amount corresponding to the total axial stretching required for conversion of the preform to a container, after which the stretched preform (11, 13) is provided with one or more barrier layers (12, 14), and the preform is then heated and converted to a container. In one embodiment, the axially stretched preform (15) is produced by assembling axially stretched part-preforms (13a, b) covered with one or more barrier layers. The combined preform is then converted to a container. By means of the invention, it is possible to reduce the thickness of the barrier layers at the time of their application, which considerably simplifies the latter.Other References
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