Barrier-coated tube of biaxially stretched thermoplastic material having a monoaxially stretched barrier coating thereon
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United States of America Patent
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Oct 7, 1986
Issued Date -
N/A
app pub date -
Apr 25, 1983
filing date -
May 29, 1980
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A 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.
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