Process and system for producing heat sealed laminates

Claim 1

IN AN APPARATUS SYSTEM FOR PRODUCING A HEAT SEALED LAMINATION FROM A FILM OF POLYOLEFIN MATERIAL AND A SUBSTRATE WEB FORMED OF A MATERIAL DISSIMILAR FROM SAID POLYOLEFIN FILM, SAID APPARATUS SYSTEM COMPRISING MEANS FOR MOVING A POLYOLEFIN FILM THROUGH A PREDETERMINED PATH WHILE MAINTAINING THE SAME IN AN UNHEATED CONDITION SO THAT THE POLYOLEFIN FILM REMAINS DIMENSIONALLY STABLE , MECHANISM FOR TREATING ONE SURFACE OF SAID POLYOLEFIN FILM, WHICH IS NORMALLY NON-POLAR TO RENDER THE SURFACE POLAR SO THAT THE TREATED SURFACE IS CAPABLE OF CHEMICAL BONDING WITH A DISSIMILAR MATERIAL THROUGH HEAT SEALING, MECHANISM FOR APPLYING CONSTANT AND UNIFORM TENSION TO THE POLYOLEFIN FILM TO STRETCH THE SAME IN THE DIRECTION OF TRAVEL THEREOF AND TO CONTRACT THE FILM TRANSVERSELY THEREOF TO THEREBY INCREASE THE LONGITUDINAL SIZE OF INDICIA PRINTED ON THE POLYOLEFIN FILM TO A PREDETERMINED SIZE, MEANS FOR MOVING A SUBSTRATE WEB OF MATERIAL THROUGH A PREDETERMINED PATH, A HEATING MECHANISM FOR HEATING A SUBSTRATE WEB DURING MOVEMENT THEREOF SO THAT AT LEAST ONE SURFACE OF THE SUBSTRATE WEB IS HEATED TO A TEMPERATURE AT LEAST APPROXIMATING THE HEAT SEALING TEMPERATURE OF ONE SURFACE OF THE POLYOLEFIN FILM, MEANS DEFINING A PLURALITY OF SPACED-APART NIPS FOR PRESSING THE FILM AGAINST THE SUBSTRATE WEB TO CAUSE TRANSFER OF HEAT FROM SAID HEATED SUBSTRATE WEB AND TO EFFECT HEAT SEALING WITH THE FILM AND IN LAMINATED FORM, MEANS FOR ADVANCING THE LAMINATE THUS FORMED, AND MEANS FOR COOLING SAID LAMINATE.