Three part high moisture barrier for packages
AssigneeKloeckner Pentaplast of America, Inc.
InventorMark Ralph Miller
Life of this patent
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Abstract
A three part laminated material for use in making blister packages and a method of making such a material. The material is comprised of a central core layer of poly chloro-tri-fluoro ethylene to each side of which a separate polymer film is adhesively attached. The method of making the material involoves use of a corona treater, a vertical forced air convection dryer, a horizontal convection dryer, a motor driven rewind, a chilled cylinder, a primary unwind and at least one laminating unwind. In the preferred embodiment, each of the polymer films is polyvinyl chloride, although a variety of different films may be used. The disclosed material provides a high moisture barrier, a stable inter-laminar structure and outer surfaces which lend themselves well to bonding with other materials.
Claims14
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.
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 primary unwind, a core layer formed of poly chloro-tri-fluoro ethylene sheet material stored on a laminating unwind and a second outer layer formed from a second polymer film stored on the primary unwind comprised of the steps of:
- unwinding the first polymer film from the primary 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 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;
- transferring the two layer laminated structure onto the laminating unwind;
- further unwinding the second polymer film from the primary unwind;
- passing the second polymer film through the corona treater;
- applying a water-based adhesive to the corona treated surface of the second polymer film using reverse gravure coating;
- transporting the adhesive-coated second polymer film through the vertical forced air convection dryer;
- unwinding the two layer laminated structure from the laminating unwind;
- moving the two layer laminated structure through a corona treater;
- laminating the corona treated surface of the poly chloro-tri-fluoro ethylene of the two layer laminated structure directly to the adhesive-treated surface of the second polymer film 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.
Dependencies are inferred from the claim text.