Patent ID: 6902645
Filing Date: 2005-06-07
Classification: B32B,B65D

Abstract:
1. A method employing a corona treater, a vertical forced air convection dryer, a horizontal convection dryer, a motor driven rewind and a chilled cylinder for making a three part, unoriented thermoformable laminated sheet material having a crystallinity level of 35% or less for use in a blister package wherein the laminated material has a first outer layer formed from a first polymer film stored on a first unwind, a core layer formed of poly chloro-tri-fluoro ethylene sheet material stored on a first laminating unwind and a second outer layer formed from a second polymer film stored on a second laminating unwind comprised of the steps of: unwinding the first polymer film from the first unwind; passing the unwound first polymer film through the corona treater; applying a water-based adhesive to the corona-treated surface of the first polymer film using reverse gravure coating; transporting the adhesive-coated first polymer film through a vertical forced air convection dryer; unwinding the poly chloro-tri-fluoro ethylene sheet material from the first laminating unwind; moving the poly chloro-tri-fluoro ethylene sheet material through the corona treater; laminating the surface of the first polymer film with dried adhesive directly to one side of the poly chloro-tri-fluoro ethylene sheet material by means of a hot nip; transporting the resulting two layer laminated structure through the horizontal forced air convection dryer; cooling the two layer laminated structure by moving it across the chilled cylinder; rewinding the two layer laminated structure onto the motor driven rewind; unwinding the two layer laminated structure from the rewind; passing the two layer laminated structure through the corona treater; applying a water-based adhesive to the corona treated surface of the poly chloro-tri-fluoro ethylene sheet material using reverse gravure coating; transporting the adhesive-coated two layer laminated structure through the vertical forced air convection dryer; unwinding the second polymer film from the second laminating unwind; moving the second polymer film through a corona treater; laminating the corona treated surface of the second polymer film directly to the remaining exposed surface of the poly chloro-tri-fluoro ethylene sheet material by means of a hot nip; transporting the resulting three layer laminated structure through the horizontal forced air convection dryer; cooling the three layer laminated structure by moving it across the chilled cylinder; and rewinding the three layer laminated structure onto the rewind.