Method for bonding liner materials

Claim 1

THE METHOD OF BONDING TOGETHER TWO WEBS OF SHEET MATERIAL, ONE OF WHICH HAS A SURFACE COATED WITH A BONDING MATERIAL, WHICH METHOD COMPRISES BRINGING THE WEBS TOGETHER WITH ONE OVERLYING AND IN CONTACT WITH THE OTHER WITH THEIR MEETING FACES EXTENDING IN THE SAME PLANE AND WITH THE BONDING MATERIAL BETWEEN THE WEBS AT SAID PLANE DRAWING THE WEBS FORWARDLY IN INTERMITTENT STEPWISE FASHION THROUGH A HEATING AND PRESSING ZONE WHILE MAINTAINING SAID WEBS IN SAID PLANE AND IN SAID SUPERIMPOSED RELATION, SIMULTANEOUSLY APPLYING HEAT AND PRESSURE TO AN EXTENDED SURFACE AREA OF ONE OF THE EXTERIOR SURFACES OF THE SUPERIMPOSED WEBS WITHIN THE SAID HEATING ZONE AND THEREBY HEATING BOTH WEBS AND THE INTERPOSED BONDING MATERIAL BY CONDUCTION OF THE HEAT THROUGH THE WEBS AND BONDING MATERIAL WHILE SUBSTANIAL SURFACE AREAS OF THE WEBS AND THE BONDING MATERIAL ARE HELD TOGETHER UNDER SAID PRESSURE, REGULATING AND CONTROLLING THE SUPPLY OF HEAT SO AS TO BRING THE BONDING MATERIAL TO A TEMPERATURE AT WHICH IT IS SOFTENED SUFFICIENTLY TO BOND THE WEBS TOGETHER, INTERMITTENTLY ADVANCING SUCCESSIVE PORTIONS OF SAID WEBS TO A SECOND PRESSING ZONE, AND WHILE THE WEBS AND BONDING MATERIAL ARE AT SUBSTANTIALLY SAID TEMPERATURE APPLYING TO THE FIRST MENTIONED PRESSURE SUBSTANTIALLY GREATER THAN SAID FIRST MENTIONED PRESSURE AND WITH SAID LOCALIZED PRESSURE APPLIED AT AND CONFINED TO A MULTIPLICITY OF PREDETERMINED ISOLATED SMALL AREAS DISTRIBUTED OVER THE AREA OF THE WEBS IN A PREDETERMINED PATTERN AND THEREBY BONDING THE WEBS TOGETHER AT SAID ISOLATED AREAS.

Claim 2

THE METHOD OF BONDING TOGETHER TWO WEBS OF SHEET MATERIAL, ONE OF WHICH HAS A SURFACE COATED WITH A BONDING MATERIAL, WHICH METHOD COMPRISES BRINGING THE WEBS TOGETHER WITH ONE OVERLYING AND IN CONTACT WITH THE OTHER WITH THEIR MEETING FACES EXTENDING IN THE SAME PLANE AND WITH THE BONDING MATERIAL BETWEEN THE WEBS AT SAID PLANE DRAWING THE WEBS FORWARDLY IN INTERMITTENT STEPWISE FASHION THROUGH A HEATING AND PRESSING ZONE WHILE MAINTAINING SAID WEBS IN SAID PLANE AND IN SAID SUPERIMPOSED RELATION, SIMULTANEOUSLY APPLYING HEAT AND PRESSURE TO AN EXTENDED SURFACE AREA OF ONE OF THE EXTERIOR SURFACES OF THE SUPERIMPOSED WEBS WITHIN THE SAID HEATING ZONE AND THEREBY HEATING BOTH WEBS AND THE INTERPOSED BONDING MATERIAL BY CONDUCTION OF THE HEAT THROUGH THE WEBS AND BONDING MATERIAL WHILE SUBSTANIAL SURFACE AREAS OF THE WEBS AND THE BONDING MATERIAL ARE HELD TOGETHER UNDER SAID PRESSURE, REGULATING AND CONTROLLING THE SUPPLY OF HEAT SO AS TO BRING THE BONDING MATERIAL TO A TEMPERATURE AT WHICH IT IS SOFTENED SUFFICIENTLY TO BOND THE WEBS TOGETHER, INTERMITTENTLY ADVANCING SUCCESSIVE PORTIONS OF SAID WEBS TO A SECOND PRESSING ZONE, AND WHILE THE WEBS AND BONDING MATERIAL ARE AT SUBSTANTIALLY SAID TEMPERATURE APPLYING TO THE FIRST MENTIONED PRESSURE SUBSTANTIALLY GREATER THAN SAID FIRST MENTIONED PRESSURE AND WITH SAID LOCALIZED PRESSURE APPLIED AT AND CONFINED TO A MULTIPLICITY OF PREDETERMINED ISOLATED SMALL AREAS DISTRIBUTED OVER THE AREA OF THE WEBS IN A PREDETERMINED PATTERN AND THEREBY BONDING THE WEBS TOGETHER AT SAID ISOLATED AREAS.