Patent ID: 7063766
Filing Date: 2006-06-20
Classification: B31F,B32B,Y10T

Abstract:
1. Method for producing a multi-ply web comprising at least three plies of flexible material by gluing the plies, which comprises: bringing a first patterned glue transfer roll, having a three dimensional pattern of protuberances in contact with a first glue application device, and transferring glue to a first web shaped flexible material in a first press nip in a first glue pattern corresponding to the configuration of the protuberances; bringing a second web shaped flexible material in contact with the glue applied side of said first web shaped flexible material in a second press nip between a first patterned lamination roll having a three dimensional pattern of protuberances corresponding to the pattern of said first patterned glue transfer roll and an impression roll; driving the first glue transfer and lamination rolls in registry with each other, so that the first and second web shaped flexible materials are pressed and glued together in a pattern corresponding to the configuration of the protuberances of said first glue transfer roll; bringing a second patterned glue transfer roll having a three dimensional pattern of protuberances in contact with a second glue application device, and transferring glue to one external side of the combined first and second web shaped flexible materials in a third press nip in a second glue pattern corresponding to the configuration of the protuberances of said second glue transfer roll; said second glue pattern being applied offset with respect to the glue pattern applied by the first glue transfer roll; bringing a third web shaped flexible material in contact with the glue applied side of said combined first and second web shaped flexible materials in a fourth press nip between a second patterned lamination roll having a three dimensional pattern of protuberances corresponding to the pattern of said second glue transfer roll and said impression roll; the second glue transfer and lamination rolls being in registry with each other, so that the third web shaped flexible material is pressed and glued to the combined first and second web shaped flexible materials in a pattern corresponding to the configuration of the protuberances of said second glue transfer roll.