Anisotropic thin polyethylene sheet and applications thereof and the process of making the same
AssigneeMuCell Extrusion, LLC
InventorsMehdi Saniei, James K. Sakorafos, Nicholas R. Torraco, Mark E. Lindenfelzer
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Abstract
This invention relates to an anisotropic multilayer film and the process of making a multilayer film, wherein a supercritical blowing agent is introduced to at least one layer, wherein at least one layer comprises 10 to 100 percent by weight LLDPE with a melt index of 0.2 to 2 g/10 min. The film in this invention can have a surface with an average Sheffield smoothness, according to TAPPI T 538, of less than 100. The film in this invention can have a puncture propagation tear resistance, in accordance with ASTM D2582, greater than 500 g/mil.
Claims23
A process of making a multilayer film comprising:
- processing a first fluid stream of polymeric material comprising polyethylene in an extruder;
- processing a second fluid stream of a second polymeric material in an extruder;
- and co-extruding the first fluid stream and the second fluid stream through an annular die to form a multilayer film comprising a solid polyethylene layer and a layer comprising the second polymeric material,
- wherein a supercritical physical blowing agent is introduced into the first fluid stream comprising polyethylene in the extruder and the multilayer film has an average Sheffield smoothness of less than 100 according to TAPPI T 538.
Dependencies are inferred from the claim text.