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AssigneePlm AB
InventorClaes T. Nilsson
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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.
A barrier-coated article comprising a tube of thermoplastic material which has been axially stretched from an amorphic condition to provide a wall of reduced thickness having monoaxially oriented crystallinity, and a barrier layer on said wall, said tube having been circumferentially expanded after axial stretching, said barrier layer being stretched substantially only circumferentially.
A barrier coated article comprising a tube of thermoplastic material including a wall having axially oriented crystallinity and being circumferentially stretched, and a barrier layer on said wall which is stretched substantially only monoaxially.
Dependencies are inferred from the claim text.