MULTI-LAYER FILMS AND RELATED METHODS
The present disclosure relates to multi-layer film constructions and related methods. The multi-layer film constructions can include a first layer joined to a second layer. The first layer can include one or more heat resistant materials. The second layer can include a sealant film, which can be a multi-layer film having one or more sealing layers or sublayers. The sealing layers can include a blend of one or more ionomers and polybutylene. The multi-layer film constructions can also be free from or devoid of wax.
1 . A multi-layer film construction, comprising:
a first layer comprising at least one of a polyamide, polyester, polypropylene, metal foil, cellulose, or paper; and
a second layer comprising an ionomer and polybutylene.
2 . The multi-layer film construction of claim 1 , wherein the second layer further comprises a cheese release additive.
3 . The multi-layer film construction of claim 1 , wherein the ionomer comprises an ethylene methacrylic acid copolymer or a salt thereof.
4 . The multi-layer film construction of claim 1 , wherein the ionomer comprises a melt flow rate of between about 0.5 g/10 min and about 15 g/10 min, between about 0.6 g/10 min and about 0.9 g/10 min, between about 1.0 g/10 min and about 1.6 g/10 min, between about 1.7 g/10 min and about 2.5 g/10 min, between about 2.6 g/10 min and about 6.0 g/10 min, or between about 6.1 g/10 min and about 15 g/10 min.
5 . The multi-layer film construction of claim 1 , wherein the ionomer comprises a melting point of between about 190° F. and about 230° F.
6 . The multi-layer film construction of claim 1 , wherein the ionomer comprises a vicat softening point of between about 125° F. and about 180° F.
7 . The multi-layer film construction of claim 1 , wherein the second layer comprises between about 30% and about 80% by weight of the ionomer.
8 . The multi-layer film construction of claim 7 , wherein the second layer comprises between about 3% and about 30% by weight of polybutylene.
9 . The multi-layer film construction of claim 1 , further comprising a foil layer.
10 . The multi-layer film construction of claim 1 , wherein the second layer comprises a first sublayer and a second sublayer, wherein the first sublayer comprises the ionomer and polybutylene, and wherein the second sublayer comprises calcium carbonate.
11 . The multi-layer film construction of claim 1 , wherein the multi-layer film construction is devoid of wax.
12 . The multi-layer film construction of claim 1 , wherein the film comprises a seal strength of between about 250 grams and about 1000 grams at seal temperatures between about 225° F. and about 500° F.
13 . A package comprising the multi-layer film construction of claim 1 , wherein the second layer is disposed on the interior of the package.
14 . The package of claim 13 , further comprising a cheese product within the package that is in contact with the second layer.
15 . A multi-layer film construction, comprising:
a first layer comprising at least one of a polyamide, polyester, polypropylene, metal foil, cellulose, or paper; and
a second layer comprising:
a first sublayer comprising polyethylene and calcium carbonate; and
a second sublayer comprising an ionomer and polybutylene.
16 . The multi-layer film construction of claim 15 , wherein the second layer further comprises a third sublayer comprising polyethylene, a fourth sublayer comprising polyethylene, and a fifth sublayer comprising an adhesive material.
17 . The multi-layer film construction of claim 15 , further comprising a foil layer.
18 . The multi-layer film construction of claim 15 , wherein the second sublayer further comprises a cheese release additive.
19 . The multi-layer film construction of claim 15 , wherein the multi-layer film construction is devoid of wax.
20 . A multi-layer film construction, comprising:
a first layer comprising at least one of a polyamide, polyester, polypropylene, metal foil, cellulose, or paper; and
a second layer comprising a multi-layer film comprising:
a first sublayer comprising polyethylene and calcium carbonate;
a second sublayer comprising polyethylene;
a third sublayer comprising polyethylene;
a fourth sublayer comprising at least one of polyethylene or an adhesive tie material; and
a fifth sublayer comprising an ionomer and polybutylene,
wherein the first sublayer is disposed adjacent to the first layer.