Adhesive bonding and miscellaneous chemical manufacture – Surface bonding means and/or assembly means therefor – With electrical controls
Patent
1992-10-08
1995-06-27
Barry, Chester T.
Adhesive bonding and miscellaneous chemical manufacture
Surface bonding means and/or assembly means therefor
With electrical controls
156378, 1563803, 333 32, 219765, B32B 3100
Patent
active
054276454
ABSTRACT:
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 providing 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.
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Barry Chester T.
Lee, Jr. William D.
Legg L. George
Quatt Mark B.
W. R. Grace & Co.,-Conn.
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