C - Chemistry – Metallurgy – 08 – J
Patent
C - Chemistry, Metallurgy
08
J
154/39, 154/71.0
C08J 5/12 (2006.01) A44B 18/00 (2006.01) A61F 13/62 (2006.01) B29C 65/00 (2006.01) B29C 65/02 (2006.01) B29C 65/18 (2006.01) B29C 65/20 (2006.01)
Patent
CA 1310568
ABSTRACT A method of and apparatus for dynamically mechanically bonding together a plurality of laminae, at least one of which comprises thermoplastic material: for example, polyethylene. In one aspect of the invention the laminae are forwarded in face to face relation through a pressure biased nip between a patterned nip defining member and an opposing nip defining member (eg, a relief patterned cylinder and an anvil cylinder) which members are independently driven to maintain a predetermined surface velocity differential between them. In another aspect of the invention which is particularly useful at intermediate and higher line velocities -- preferably for line velocities of about 300 feet or more per minute and, more preferably, for line speeds of about 450 feed or more per minute -- the nip defining members may be operated with equal surface velocities. In each of these aspects of the invention, the members may be biased towards each other to provide a predetermined pattern-element-psi loading; and, additionally, they may be independently heated to provide each with an elevated surface temperature which is, preferably, in a predetermined range below the melt temperature of the thermoplastic laminae disposed closest to or in contact with each respective nip defining member as the laminae are forwarded through the nip.
569797
Ball Walter Kenneth
Goulait David Joseph Kenneth
Zorb James Edward
Sim & Mcburney
The Procter & Gamble Company
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