Configuration of multiple thermoformable film layers for rigid packaging requiring moisture and oxygen protection
AssigneeKlöckner Pentaplast of America, Inc.
InventorSteven J. Warakomski
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Abstract
A four-layer film for packaging, including blister packaging, is described. Layer 1 may be a rigid film, such as a polyvinyl chloride (PVC) or polyester. Layer 2 may be a moisture barrier, such as polychlorotrifluoroethylene (PCTFE). Layer 3 may be an oxygen barrier, such as a co-extruded film having a polyethylene (PE) layer, an EVOH layer, and a second PE layer. Layer 4 may be a relatively thin layer of a rigid film, such as a PVC or polyester. In this arrangement, Layer 2 may protect the contents of the package from external or atmospheric moisture. Layer 2 may also protect Layer 3 from atmospheric moisture, thereby helping to preserve the effectiveness of Layer 3 as an oxygen barrier.
Claims20
A film comprising:
- a first layer consisting essentially of at least one of polyvinyl chloride and polyester;
- a second layer consisting essentially of polychlorotrifluoroethylene;
- a third layer comprising
- a first sublayer consisting essentially of polyethylene,
- a second sublayer consisting essentially of ethylene vinyl alcohol copolymer, and
- a third sublayer consisting essentially of polyethylene;
- and
- a fourth layer consisting essentially of at least one of polyvinyl chloride and polyester, the fourth layer comprising a higher gloss side and a lower gloss side.
A method of making a film comprising:
- providing a first layer consisting essentially of at least one of polyvinyl chloride and polyester;
- attaching a second layer consisting essentially of polychlorotrifluoroethylene to the first layer;
- attaching a third layer to the second layer, the third layer comprising
- a first sublayer consisting essentially of polyethylene,
- a second sublayer consisting essentially of ethylene vinyl alcohol copolymer, and
- a third sublayer consisting essentially of polyethylene;
- and
- attaching a fourth layer to the third layer, the fourth layer consisting essentially of at least one of polyvinyl chloride and polyester, the fourth layer comprising a higher gloss side and a lower gloss side.
A film comprising:
- a first layer of consisting essentially of at least one of polyvinyl chloride and polyester;
- a second layer consisting essentially of polychlorotrifluoroethylene;
- a third layer comprising
- a first sublayer consisting essentially of polyethylene,
- a second sublayer consisting essentially of ethylene vinyl alcohol copolymer, and
- a third sublayer consisting essentially of polyethylene.
Dependencies are inferred from the claim text.