Apparatus for heat sealing plastic packages

Claim 1

APPARATUS FOR SEALING THERMOPLASTIC PACKAGES COMPRISING A CONVEYOR MECHANISM INCLUDING FIRST AND SECOND CONVEYOR CHAINS SPACED TO DEFINE UPPER AND LOWER PAIRS OF CHAIN CONVEYOR RUNS, HEATING MEANS SUPPORTED BETWEEN SAID UPPER PAIRS OF CONVEYOR RUNS TO ONE SIDE OF A LONGITUDINAL CENTER LINE BETWEEN THE UPPER PAIR OF CONVEYOR RUNS, COOLING MEANS SUPPORTED BETWEEN SAID UPPER PAIR OF CONVEYOR RUNS TO ONE SIDE OF A LONGITUDINAL CENTER LINE BETWEEN THE UPPER PAIR OF CONVEYOR RUNS, SAID HEATING AND COOLING MEANS INCLUDING RESPECTIVE HEATING AND COOLING SURFACES SUBSTANTIALLY COPLANAR TO A PLANE THROUGH SAID UPPER PAIR OF CONVEYOR RUNS, A PLURALITY OF SHEETLIKE MEMBERS CARRIED BY SAID CHAINS, CONNECTING MEANS SWINGABLY JOINING EACH OF THE SHEET-LIKE MEMBERS SOLELY AT AN EDGE THEREOF TO EACH OF A PLURALITY OF TRANSVERSE SUPPORT MEMBERS SECURED BETWEEN SAID CHAINS, A MEMBER BELOW SAID LOWER PAIR OF CONVEYOR RUNS FOR SUPPORTING THE SHEET-LIKE MEMBERS THEREBETWEEN IN A PLANE SUBSTANTIALLY PARALLEL TO SAID FIRST MENTIONED PLANE, MEANS ABOVE SAID HEATING MEANS FOR URGING THERMOPLASTIC PACKAGES CARRIED BY THE SHEET-LIKE MEMBERS INTO IN TIMATE CONTACT THEREWITH, AND EACH OF SAID SHEET-LIKE MEMBERS BEING CONSTRUCTED FROM FIBERGLASS COATED WITH A POLYMERIZED TETRAFLUORO ETHYLENE COMPOSITION.