Method and apparatus for heat sealing of packaging materials emp

Electric heating – Capacitive dielectric heating – Bonding

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219777, 219780, 1562744, 1563804, 1563806, H05B 654, B23K 1300

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057367191

ABSTRACT:
Method and apparatus employing radio frequency electric energy for heat sealing of laminated packaging materials, particularly aseptic packaging materials, that include facing contiguous layers of thermoplastic material, including first and second seal jaws having respective working surfaces. The working surface of the first seal jaw is defined by a plurality of working faces of alternating layers of electrically conductive and electrically nonconductive materials. Upon the application of RF energy across the electrically conductive layers of the first seal jaw, selective melting of the layers of thermoplastic material occurs, whereupon the contact pressure exerted by the seal jaws upon the layers of packaging material is assumed by the volume of nonmolten thermoplastic material disposed between the faces of the electrically nonconductive layers of the first seal jaw and the working surface of the second seal jaw, thereby causing the seal jaws to move toward each other by a limited amount by reason of deformation of the packaging material. A seal of consistent and good uniformity is formed.

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