Impulse radiant sealer

Claim 1

HEAT SEALING APPARATUS FOR SEALING SUPERIMPOSED PLIES OF THERMOPLASTIC FILM TO EACH OTHER ALONG A PREDETERMINED LINE, COMPRISING MEANS FOR PRESSING CONFRONTING SURFACE PORTIONS OF SAID PLIES AGAINST EACH OTHER ADJACENT SAID LINE, SAID PRESSING MEANS COMPRISING RELATIVELY MOVABLE CONFORNTING MEANS HAVING OPPOSED SURFACES FOR RELEASABLY CLAMPING SAID SURFACE FILM PORTIONS THEREBETWEEN, ONE OF SAID CONFRONTING MEANS COMPRISING A METAL BAR HAVING SPACED INNER SIDE WALLS DEFINING A LONGITUDINALLY EXTENDING GROOVE WITH AN OPENING FACING THE OTHER OF SAID CONFRONTING MEANS, ELECTRICAL INSULATION MEANS IN SAID GROOVE OF SAID BAR, SAID INSULATION MEANS COMPRISING A SERIES OF CERAMIC BLOCKS DISPOSED IN ADJACENT END-TO-END RELATION IN SAID GROOVE OF THE BAR, SAIID BLOCKS HAVING GROOVES IN REGISTRY WITH EACH OTHER AND COLLECTIVELY FORMING A GROOVE HAVING AN OPENING ADJACENT SAID OPERING OF SAID GROOVE OF THE BAR AND EXTENDING LONGITUDINALLY OF SAID BAR, THE OUTER SURFACES OF SAID BLCKS ADJACENT SAID GROOVES THEREIN FORMING AT LEAST PART OF ONE OF SAID OPPOSED SURFACES OF SAID FILM PRESSING MEANS, SAID COLLECTIVELY FORMED GROOVE OF SAID CERAMIC BLOCK BEING V-SHAPED IN CROSS SECTION, AND A RADIANT HEATING MEMBER DISPOSED IN THE EXTENDING LONGITUDINALLY OF SAID GROOVES OF SAID CERMIIC BLOCKS AND HAVING AN OUTER SURFACE FLUSH WITH YET SPACED FROM SAID OUTER SURFACES OF SAID BLOCKS FOR RADIANTLY HEATING SAID FILM PLIES TO THEIR MELTING TEMPERATURE ADJACENT SAID SEALING LINE WHILE SAID FILM SURFACE PORTIONS ARE CLAMPED BETWEEN SAID PRESSING MEANS, THEREBY HEAT-SEALING SAID PLIES TO EACH OTHER.