Abstract: A method for making a multi-layer plastic preform employs blow molding air into the multi-layer parison until an outer layer of the multi-layer parison rests against the preform mold and thereafter inserting a compression core sized to fit the pre-blown preform to smooth the inner layer of the blown parison and finish the preform. A system for making a multi-layer plastic preform includes a blow stem assembly having a device for introducing air into a multi-layer parison captured by a preform mold in a blow-mold operation, and a compression preform core attached to an end of a compression rod wherein when the compression preform core is retracted into the device, air can be blown into the preform mold and when, the compression rod extends in a stroke through the device, the compression preform core extends out of the device into the preform mold.

Abstract: A method is provided for bonding a neck to a plastic container. The method includes providing the container with an opening having a first bonding surface, providing the neck with an opening having a second bonding surface, providing a foil seal between the first bonding surface and the second bonding surface, induction sealing at least one of the first and second bonding surfaces to the foil seal by using a magnetic field generated by an induction sealing head, and providing a field influencing object near the foil seal to influence a portion of the magnetic field generated by the induction sealing head.

Abstract: A test device can acquire interior temperature, interior pressure, and interior volume data on a container exposed to conditions in a test throughout the test and can be used with a computer system.