Preform of a thermoplastic
AssigneePlm AB
InventorClaes T. Nilsson
Life of this patent
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Abstract
A preform of thermoplastic material composed of a number of separate part-preforms fitted into one another in readiness for blow moulding to form a finished container. At least one of the part-preforms is stretched in the axial direction to provide crystallinity by monoaxial orientation. The part-preforms are singly or jointly provided with barrier layers. Different plastic materials can be used for the part-preforms as well as reprocessed plastic for one of the part-preforms. Through suitable selection of the material of the part-preforms as well as of the material of the barrier layers, it is possible to mould containers suitable for a great variety of different fields of application.
Claims10
An expandable preform assembly capable of being blow molded to a container, said assembly comprising inner and outer distinct, interfitted part-preforms of tubular shape with opposite open and closed ends, each of said part-preforms being constituted of a thermoplastic material capable upon molding of being joined to the other part-preform to form a container having inner and outer layers respectively conforming to said part-preforms, at least one of said interfitted part-preforms being axially stretched, prior to molding, to provide crystallinity obtained by monoaxial orientation.
Dependencies are inferred from the claim text.