Electric heating – Inductive heating – With heat exchange
Patent
1994-07-07
1995-05-16
Leung, Philip H.
Electric heating
Inductive heating
With heat exchange
219634, 156 69, 1562742, H05B 610
Patent
active
054163030
ABSTRACT:
A process for forming, handling, circumferentially sealing, and inverting a thin plastic half bag to an inwardly tapered, continuous inner side wall of an outer plastic container. A non-metallic mandrel is used as a tool for thermoforming a half bag over the top of the mandrel. The top of the mandrel with bag attached is inserted into an open end of the outer plastic container. A continuous metal ring connected at the circumference of the mandrel, positioned near the open end of the half bag, wedges the bag against the tapered inner side wall of the container near the midpoint of the container to form a sealing interface therebetween. A magnetic induction field generated near the container heats the metal ring on the mandrel. Heat is conducted to the sealing interface to weld the bag to the container. After the field is removed and the metal ring cools, the mandrel with metal ring is withdrawn from the thin plastic bag. Vacuum applied to the closed end of the bag from the top of the mandrel causes the bag to be inverted to the open end of the container as the mandrel is withdrawn.
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Grooms John P.
Mattson Larry J.
Hilton Michael E.
Kock Ronald W.
Leung Philip H.
The Proctor & Gamble Company
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