초록 ▼

A very thin inner layer composed of a polymer chosen for its barrier and/or inertness properties is fabricated within a container preform constructed mainly from another polymer, or a structure of polymers. The inner layer on the preform is produced either by a controlled coating method involving co

A very thin inner layer composed of a polymer chosen for its barrier and/or inertness properties is fabricated within a container preform constructed mainly from another polymer, or a structure of polymers. The inner layer on the preform is produced either by a controlled coating method involving coating of the injection mold core rod prior to injection molding or by a coating applied directly to the preform after injection molding. This enables both inner and main layers to be brought together at a time when the interface between them is molten. A tie layer can be employed, when desirable, to enable the layers to be combined without melting the layer interface.

대표청구항 ▼

[ I claim:] [1.] A method of fabricating an inner layer of a first polymer within a stretch blown container preform consisting of a second polymer, comprising the steps of:(a) inserting said container preform of said second polymer into a cooling mantle;(b) inserting a radiant heating element inside

[ I claim:] [1.] A method of fabricating an inner layer of a first polymer within a stretch blown container preform consisting of a second polymer, comprising the steps of:(a) inserting said container preform of said second polymer into a cooling mantle;(b) inserting a radiant heating element inside of the preform for melting the inner surface of the preform while keeping the main body of the preform relatively cool;(c) withdrawing the preform from the cooling mantle;(d) placing a depositor of the first polymer adjacent the preform and injecting a predetermined amount of the first polymer while in a molten state, and having predetermined barrier and/or inertness characteristics into the preform;(e) inserting means into the preform for displacing the molten first polymer and evenly spreading the first polymer inside the preform to form said inner layer therein; and(f) reinserting the preform into the cooling mantle and cooling the inner layer until the first polymer solidifies.