Coextruded Film For Flexible Bags
A film for a flexible bag comprising a plurality of coextruded layers. The layers include a core layer, a first skin layer and a second skin layer. The core layer is a polymer having a modulus equal to or less than 120 MPa. The core layer has a first side and a second side opposite the first side. The first skin layer is coextruded directly on the first side of the core layer. The first skin layer has a density greater than 0.916 g/cc. The second skin layer is coextruded directly on the second side of the core layer. The second skin layer has a density greater than 0.916 g/cc. A flexible bag is further disclosed.
1 . A film for a flexible bag comprising a plurality of coextruded layers, the layers comprising:
a core layer comprising a polymer having a modulus equal to or less than 120 MPa, the core layer having a first side and a second side opposite the first side;
a first skin layer coextruded directly on the first side of the core layer, the first skin layer having a density greater than 0.916 g/cc; and
a second skin layer coextruded directly on the second side of the core layer, the second skin layer having a density greater than 0.916 g/cc.
2 . The film for a flexible bag of claim 1 wherein the core layer comprises a polyethylene material.
3 . The film for a flexible bag of claim 2 wherein the core layer comprises one of the group consisting of mPE, POP and POE.
4 . The film for a flexible bag of claim 3 wherein the core layer has a density that is less than or equal to 0.916 g/cc.
5 . The film for a flexible bag of claim 1 wherein the film has a thickness, with the core layer comprising 10% to 90% of the thickness of the film.
6 . The film for a flexible bag of claim 1 wherein the first skin layer comprises a polyethylene material.
7 . The film for a flexible bag of claim 6 wherein the first skin layer comprises LLDPE.
8 . The film for a flexible bag of claim 7 wherein the film has a thickness, with the first skin layer comprising 5% to 45% of the thickness of the film.
9 . The film for a flexible bag of claim 1 wherein the second skin layer comprises a polyethylene material.
10 . The film for a flexible bag of claim 9 wherein the second skin layer comprises LLDPE.
11 . The film for a flexible bag of claim 10 wherein the film has a thickness, with the second skin layer comprising 5% to 45% of the thickness of the film.
12 . The film for a flexible bag of claim 1 wherein the first skin layer and the second skin layer are substantially identical.
13 . The film for a flexible bag of claim 1 wherein the core layer comprises 1.2 mil of 100% of one of mPE, POP and POE, the first skin layer comprises a 0.4 mil 100% LLDPE and the second skin layer comprises a 0.4 mil 100% LLDPE.
14 . A film for a flexible bag comprising a plurality of coextruded layers, the layers essentially consisting of:
a core layer essentially consisting of a polymer having a modulus equal to or less than 120 MPa, the core layer having a first side and a second side opposite the first side;
a first skin layer coextruded directly on the first side of the core layer, the first skin layer having a density greater than 0.916 g/cc; and
a second skin layer coextruded directly on the second side of the core layer, the second skin layer having a density greater than 0.916 g/cc.
15 . The film for a flexible bag of claim 14 wherein the film has a thickness, with the thickness of the core layer being between 10% and 90% of the thickness of the film, the first skin layer being between 5% and 45% of the thickness of the film and the second skin layer being between 5% and 45% of the thickness of the film.
16 . A flexible bag comprising:
a front panel having an outer surface and an inner surface opposite the outer surface;
a back panel having an outer surface and an inner surface opposite the outer surface; and
a plurality of seals joining the front panel to the back panel with the inner surface of the front panel facing the inner surface of the back panel, to define a fluid cavity;
each of the front panel and the back panel comprising a film that is coextruded and includes a plurality of layers, the plurality of layers comprising:
a core layer comprising a polymer having a modulus equal to or less than 120 MPa, the core layer having a first side and a second side opposite the first side;
a first skin layer coextruded directly on the first side of the core layer, the first skin layer having a density greater than 0.916 g/cc; and
a second skin layer coextruded directly on the second side of the core layer, the second skin layer having a density greater than 0.916 g/cc,
wherein the first skin layer defines the outer surface of the bag, and the second skin layer defines the inner surface of the bag.
17 . The flexible bag of claim 16 wherein the core layer comprises one of the group consisting of mPE, POP and POE.
18 . The flexible bag of claim 17 wherein the core layer has a density that is less than or equal to 0.916 g/cc.
19 . The flexible bag of claim 16 wherein at least one of the first skin layer and the second skin layer comprises LLDPE.
20 . The flexible bag of claim 16 wherein the film has a thickness, with each of the first skin layer and the second skin layer comprising 5% to 45% of the thickness of the film.