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US 12,502,873 B2Granted
Multi-layer polymer foam film for packaging applications and the method of making the same
AssigneeMuCell Extrusion, LLC
InventorsMehdi Saniei, Mark E. Lindenfelzer, Eric V. Fredrickson
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Abstract
A multilayer foam film suitable for direct and non-direct food contact and aseptic packaging application is disclosed.
Claims19
A creased, folded or scored multilayer foam film comprising:
- a foam layer including a plurality of cells, wherein at least 10% of the cells are closed cells, and
- two solid skin layers comprising HDPE on each side of the foam layer, and
- a solid layer comprising ethylene vinyl alcohol (EVOH), wherein the said foam layer is between one of the solid skin layers comprising HDPE and the solid layer comprising EVOH, and
- the film has an overall thickness equal to or greater than 8 mils, an oxygen transmission rate of less than 5 cc/m2/24 hr, according to ASTM D398, and a ratio of the oxygen transmission rate of the creased, folded or scored film over that of an identical film prior to creasing, folding or scoring is less than 1.1.
1 more element
A method of making a creased, folded or scored multilayer film, comprising:
- co-extruding a foam layer, two solid skin layers comprising HDPE, and one solid layer comprising ethylene vinyl alcohol (EVOH) to form a multilayer film, wherein the foam layer includes a plurality of cells, wherein at least 10% of the cells are closed cells and the foam layer is between one of the solid skin layers comprising HDPE and the solid layer comprising EVOH, and the film has an overall thickness equal to or greater than 8 mils, and an oxygen transmission rate of less than 5 cc/m2/24 hr, according to ASTM D398;
- and
- creasing, folding or scoring the multi-layer film, wherein the oxygen transmission rate value of the creased, folded or scored film does not increase more than 10% of the oxygen transmission rate value of the multi-layer film prior to creasing, folding or scoring.
Dependencies are inferred from the claim text.