Multi-layer plastic preform for blow molding
AssigneePlastipak Packaging, Inc.
InventorWilliam A. Slat
Life of this patent
Estimating the term…
Abstract
A multi-layer plastic preform 14 with an inner layer 28 that is extrusion blow molded from a resin having an intrinsic viscosity greater than 0.90, and an outer layer 44 that is injection molded around the inner layer from a resin having an intrinsic viscosity that is at least 0.10 less than the intrinsic viscosity of the inner layer. The inner layer 28 is no greater than 20% (preferably no greater than 15%) by weight of the total weight of the preform and the outer layer 44 is at least 80% (preferably at least 85%) by weight of the total weight of the preform.
Claims16
A multi-layer plastic preform for blow molding a container, comprising:
- an inner layer that is extrusion blow molded from a resin having an intrinsic viscosity greater than 0.90, and the inner layer being no greater than 20% by weight of the total weight of the preform;
- and
- an outer layer that is injection molded around the inner layer from a resin having an intrinsic viscosity that is at least 0.10 less than the intrinsic viscosity of the inner layer, and the outer layer being at least 80% by weight of the total weight of the preform.
A multi-layer plastic preform for blow molding a container, comprising:
- an inner layer that is extrusion blow molded from a resin having an intrinsic viscosity greater than 1.0, and the inner layer being no greater than 15% by weight of the total weight of the preform;
- and
- an outer layer that is injection molded around the inner layer from a resin having an intrinsic viscosity that is at least 0.15 less than the intrinsic viscosity of the inner layer, and the outer layer being at least 85% by weight of the total weight of the preform.
A multi-layer plastic preform for blow molding a container and made by the method comprising:
- extruding a resin having an intrinsic viscosity greater than 0.90 as a parison of a tubular shape;
- blow molding the parison to provide an inner layer that is no greater than 20% by weight of the total weight of the preform;
- and
- injection molding a round the inner layer an outer layer of a resin having an intrinsic viscosity that is at least 0.10 less than the intrinsic viscosity of the inner layer, and the outer layer being at least 80% by weight of the total weight of the preform.
Dependencies are inferred from the claim text.