Three part high moisture barrier for packages
AssigneeKloeckner Pentaplast of America, Inc.
InventorsMark Ralph Miller, Kevin Junior Carter
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 fluoro-polymer based sheet material to each side of which a separate polymer film is adhesively attached. In the preferred embodiment, each of the polymer films is polyvinyl chloride, although a variety of chemically 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.
Claims13
A thermoformable laminated material having high moisture vapor barrier characteristics for use in a blister package comprised of:
- a fluoro-polymer-based sheet material;
- a first polymer film attached to a first side of said fluoro-polymer-based sheet material;
- and
- a second polymer film attached to the opposing side of said fluoro-polymer-based sheet material.
A thermoformable laminated material having high moisture vapor barrier characteristics for use in a blister package comprised of:
- a fluoro-polymer-based sheet material having a thickness in the approximate range of 0.6 mils and 3.0 mils;
- a first polyvinyl chloride film having a thickness in the approximate range of 5.0 mils to 15 mils. adhesively attached by means of a heat-activated dry bond laminating adhesive to a first side of said fluoro-polymer-based sheet material;
- and
- a second polyvinyl chloride film having a thickness in the approximate range of 5.0 mils to 15 mils. adhesively attached by means of a heat-activated dry bond laminating adhesive to a first side of said fluoro-polymer-based sheet material.
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 thermoformable laminated sheet material for use in a blister package wherein the laminated material has a first outer layer formed from PVC film stored on a first unwind, a core layer formed of a fluoro-polymer-based sheet material stored on a first laminating unwind and a second outer layer formed from PVC film stored on a second laminating unwind comprised of the steps of:
- unwinding the first outer layer of PVC film from the first unwind;
- passing the unwound PVC film through the corona treater;
- applying a water-based adhesive to the corona-treated surface of the first outer layer of PVC film using reverse gravure coating;
- transporting the adhesive-coated first outer layer of PVC film through a vertical forced air convection dryer;
- unwinding the fluoro-polymer-based sheet material from the first laminating unwind;
- moving the fluoro-polymer-based sheet material through the corona treater;
- laminating the first outer layer of PVC film with dried adhesive directly to one side of the fluoro-polymer-based 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 fluoro-polymer-based sheet material surface of the corona-treated two layer laminated structure using reverse gravure coating;
- transporting the adhesive-coated two layer laminated structure through the vertical forced air convection dryer;
- unwinding the second outer layer of PVC film from the second laminating unwind;
- moving the second outer layer of PVC film through a corona treater;
- laminating the second outer layer of PVC film directly to the remaining exposed surface of the fluoro-polymer-based 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.
Dependencies are inferred from the claim text.