公开(公告)号：US20230330974A1

公开(公告)日：2023-10-19

申请号：US18083451

申请日：2022-12-16

申请人： MuCell Extrusion, LLC

发明人： Mehdi Saniel

IPC分类号： B32B27/06 ,  B32B27/30 ,  B32B27/32 ,  B32B27/08 ,  B32B27/20 ,  B32B1/08 ,  B29C48/00 ,  B29C48/10 ,  B29C48/21 ,  C08J5/18 ,  B32B5/20

CPC分类号： B32B27/065 ,  B32B27/306 ,  B32B27/32 ,  B32B27/08 ,  B32B27/20 ,  B32B1/08 ,  B29C48/0018 ,  B29C48/022 ,  B29C48/10 ,  B29C48/21 ,  C08J5/18 ,  B32B5/20 ,  C08J2329/04 ,  B32B2266/08 ,  B32B2307/72 ,  B32B2307/7246 ,  B32B2266/025 ,  B32B2250/03 ,  B32B2250/05 ,  B32B2439/70 ,  B29K2023/065

摘要： A multi-layer foam film comprising polypropylene for direct and non-direct food contact and aseptic packaging application is disclosed. In an embodiment, the film has a bulk density of less than 0.962 gr/cm3 wherein more than 50% of the cells in the foam layer are closed cells. In an embodiment, the foam films are thick (generally more than 8 mils thick) and have a bending stiffness value of more than 18, in Taber stiffness unit configuration according to TAPPI/ANSI T 489 om-15, and the ratio of the mass per unit area (the mass of a unit area of the film in gram per meter-squared (gr/m2)) over the stiffness value in Taber unit configuration is equal to or less than 13. In an embodiment, the film has a very smooth surface with a smoothness value of less than 25 in Sheffield smoothness unit configuration according to TAPPI T 538. The described foam film can have a water vapor transmission rate value of less than 1 gr/m2/24 hr, according to ASTM E398-13. The described foam film can have an oxygen transmission rate value of less than 10 cc/m2/24 hr, according to ASTM D3985.