Multilayer film and package
AssigneeSumitomo Bakelite Co., Ltd.
InventorHideki KAI
Life of this patent
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Abstract
A multilayer film, including: a barrier layer in which an unstretched first film layer containing a first resin, and an unstretched second film layer containing a second resin different from the first resin are alternately and repeatedly laminated; a pair of unstretched first outer layers sandwiching the barrier layer; and a pair of unstretched second outer layers sandwiching the pair of unstretched first outer layers, wherein the average thickness per layer of the first film layers is 10 to 1,000 nm, and the lamination number of the first film layers in the barrier layer is in the range of 50 to 5,000.
Claims16
A method for manufacturing a PTP package, comprising:
- forming a plurality of protrusions in a multilayer film to produce a molded film;
- filling the plurality of protrusions in the molded film with a plurality of tablets, respectively;
- superposing a cover film with the multilayer film;
- and
- adhering the molded film to the cover film,
- wherein the multilayer film has a total thickness in a range of 20 to 750 μm and comprises a barrier layer, a pair of unstretched first outer layers sandwiching the barrier layer, and a pair of unstretched second outer layers sandwiching the pair of unstretched first outer layers, the barrier layer has a thickness in a range of 10 to 500 μm and comprises a plurality of unstretched first film layers comprising a first resin, and a plurality of unstretched second film layers comprising a second resin such that the second resin is different from the first resin and that the unstretched first film layers and the unstretched second film layers are alternately laminated, the unstretched first film layers have an average thickness per layer in a range of 10 to 1,000 nm and a lamination number in a range of 50 to 5,000, the pair of unstretched first outer layers have a total thickness in a range of 5 to 125 μm and are resin layers comprising the first resin and an elastomer, the pair of unstretched second outer layers have a total thickness in a range of 5 to 125 μm and are resin layers comprising the first resin, the elastomer is an olefin-based elastomer, and the first resin and the second resin are polyolefin-based resins.
Dependencies are inferred from the claim text.