B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
B29C 65/14 (2006.01) B29C 65/00 (2006.01) B29C 65/04 (2006.01) B29C 65/18 (2006.01) H05B 6/46 (2006.01) H05B 6/48 (2006.01) H05B 6/54 (2006.01)
Patent
CA 2084843
ABSTRACT OF THE DISCLOSURE Films of thermoplastic material may be sealed together by application of a radio frequency field through a pair of oppositely positioned electrodes. Preferred thermoplastic materials have a low dielectric dissipation factor, and such materials include polyethylene. The sealing apparatus includes a circuit having compensation and matching circuits for provid- ing resonant operation and minimizing the amount of reflected energy from the electrodes. Through the use of this invention effective RF sealing is produced between films of thermoplastic material having a low dielectric dissipation factor. Further the sealing apparatus preferably includes at least one electrode coated with a ceramic and a release material for providing thermal conduction to the films, thereby enhancing the sealing effectiveness of the apparatus.
Smart & Biggar
W.r. Grace & Co.,-Conn.
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