US 11,926,123 B2
Multi-layer polymer foam film for packaging applications and the method of making the same
Mehdi Saniei, Belmont, MA (US); Mark E. Lindenfelzer, Milton, MA (US); and Eric V. Fredrickson, Lancaster, MA (US)
Assigned to MuCell Extrusion, LLC, Woburn, MA (US)
Filed by MuCell Extrusion, LLC, Woburn, MA (US)
Filed on Nov. 18, 2021, as Appl. No. 17/530,407.
Application 17/530,407 is a continuation in part of application No. 16/875,198, filed on May 15, 2020, granted, now 11,376,823.
Claims priority of provisional application 62/849,329, filed on May 17, 2019.
Prior Publication US 2022/0152996 A1, May 19, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. B32B 27/06 (2006.01); B29C 48/00 (2019.01); B29C 48/08 (2019.01); B29C 48/21 (2019.01); B29K 23/00 (2006.01); B29K 105/04 (2006.01); B29L 7/00 (2006.01); B29L 9/00 (2006.01); B32B 3/26 (2006.01); B32B 5/18 (2006.01); B32B 27/20 (2006.01); B32B 27/30 (2006.01); B32B 27/32 (2006.01); B32B 38/04 (2006.01); B65D 65/40 (2006.01)
CPC B32B 27/065 (2013.01) [B29C 48/0019 (2019.02); B29C 48/0022 (2019.02); B29C 48/022 (2019.02); B29C 48/08 (2019.02); B29C 48/21 (2019.02); B32B 3/266 (2013.01); B32B 5/18 (2013.01); B32B 27/20 (2013.01); B32B 27/306 (2013.01); B32B 27/32 (2013.01); B32B 38/04 (2013.01); B65D 65/40 (2013.01); B29K 2023/065 (2013.01); B29K 2023/086 (2013.01); B29K 2105/046 (2013.01); B29L 2007/008 (2013.01); B29L 2009/00 (2013.01); B32B 2038/042 (2013.01); B32B 2038/047 (2013.01); B32B 2266/025 (2013.01); B32B 2266/08 (2013.01); B32B 2307/546 (2013.01); B32B 2307/72 (2013.01); B32B 2307/7244 (2013.01); B32B 2307/7246 (2013.01); B32B 2307/732 (2013.01); B32B 2553/00 (2013.01)] 23 Claims
 
1. A creased, folded or scored multilayer foam film comprising:
a first foam layer including a plurality of cells, wherein at least 10% of the cells are closed cells,
a second foam layer including a plurality of cells, wherein at least 10% of the cells are closed cells,
two solid skin layers comprising HDPE such that the first and second foam layers are disposed between the two solid skin layers, and
a solid layer comprising ethylene vinyl alcohol (EVOH) between the first foam layer and the second foam layer, wherein the said first foam layer is between one of the solid skin layers and the solid layer comprising EVOH, and the said second foam layer is between one of the solid skin layers and the solid layer comprising EVOH, and the film has an overall thickness equal to or greater than 8 mils, and the ratio of the oxygen transmission rate of the creased, folded or scored film in cc/m2/24hr, according to ASTM D3985, over that of an identical film prior to creasing, folding or scoring is less than 1.1.