Package making – Methods – With contents treating
Reexamination Certificate
2005-03-08
2005-03-08
Huynh, Louis (Department: 3721)
Package making
Methods
With contents treating
C053S432000, C053S477000, C053S086000, C053S512000
Reexamination Certificate
active
06862867
ABSTRACT:
A system for sealing thermoplastic film includes one or more bag sealing units, each comprising a lower vacuum platen and a vacuum chamber cover adapted for sealing engagement on the platen to form a vacuum chamber. A sealing bar assembly includes a sealing bar designed for constant heated operation and a pair of cooling plates which function as heat sinks. The sealing bar assembly is pneumatically reciprocated between a raised, disengaged position and a lowered position with the sealing bar engaging the neck of a bag for hermetically sealing same. The cooling plates clamp the bag neck against a sealing support assembly. A method of sealing a thermoplastic film bag includes the steps of placing a packaging object in a thermoplastic bag and placing the bag on a cradle with the bag neck extending over a bag support assembly. A vacuum chamber cover is placed on the platen and evacuated to form a vacuum chamber. A sealing bar assembly melds the thermoplastic to form a sealed area across the bag neck. A cutoff knife blade severs the end of the bag beyond a sealed area, which extends across its neck.
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PCT International Search Report, PCT/US04/00716, International Filing Date Jan. 13, 2004, Pack-Tech, LLC, Applicant.
Balek Theodore A.
Cady Derril R.
Taylor, Sr. Mark W.
Brown Mark E.
Huynh Louis
Pack-Tech, L.L.C.
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