Electric heating – Heating devices – Combined with pressure application means
Reexamination Certificate
2007-08-28
2007-08-28
Leung, Philip H. (Department: 3742)
Electric heating
Heating devices
Combined with pressure application means
C156S251000, C156S583100, C156S583300, C053S370700, C053S374200
Reexamination Certificate
active
10869233
ABSTRACT:
An apparatus is provided for forming bag edges in a layered plastic film. The apparatus includes a heated seal bar and a seal bar anvil. The seal bar anvil has a resilient tube configured to deform as the seal bar is driven into the tube to seal and sever a bag edge therebetween. According to one construction, the resilient tube is pressurized pneumatically from the inside so as to impart a specific, desired resilience to the tube as the tube and seal bar co-act on either side of the layered plastic film.
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Irwin Jere F.
Vantrease Dale L.
Irwin Jere F.
Leung Philip H.
Ralis Stephen
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