Patent ID: 8196630
Filing Date: 2012-06-12
Classification: B29C,Y10T

Abstract:
1. A system for controlling the strength of seals imparted to workpiece layers by a sealing roll and an anvil roll, comprising: a pair of rotatably-supported rolls, including a sealing roll and an anvil roll arranged on opposing sides of a conveyed web of workpiece layers, wherein the sealing roll comprises one continuous sealing head comprising two or more textured sealing regions, two or more gaps between the sealing regions, and two or more temperature set points, wherein the gaps thermally isolate adjacent sealing regions from one another; a plurality of heating elements provided on at least one of the rolls; a plurality of temperature sensors provided on the at least one of the rolls; and a controller in communication with the sensors and the heating elements; wherein the seal imparted to workpiece layers comprises at least one generally-continuous seal comprising two or more sealing zones, wherein each sealing zone has a peel strength, and wherein the peel strength of one sealing zone is higher than the peel strength of an adjacent sealing zone.