Films for use as interleaves between substrates
AssigneeTredegar Surface Protection, LLC
InventorsBankim Bhupendra Desai, Carl Douglas Ray, Ricky Santoso, Shailesh Chunilal Patel, Kevin A. Brady
Life of this patent
Estimating the term…
Abstract
Films may be used as interleaves between hard and non-compressible surfaces such as surfaces of sheets or plates made of glass, metal, such as steel, polycarbonate, and/or poly(methyl methacrylate). The films may be embossed and/or may include a foamed core layer having a plurality of micro-voids. In particular, the films may include a polyolefin, a basis weight of between about 30 gsm and about 70 gsm, an embossed thickness of between about 150 microns and 800 microns, and a stiffness of between about 150 grams and about 750 grams according to the Circular Bend Stiffness Test.
Claims25
A film for use as an interleaf between substrates, comprising:
- a polyolefin;
- a base portion;
- a plurality of raised portions offset from the base portion on one side of the base portion and a plurality of protrusions on an opposite side of the base portion, wherein the plurality of raised portions comprises a plurality of substantially parallel ribs;
- a basis weight of between about 30 gsm and about 70 gsm;
- an embossed thickness of between about 150 microns and 800 microns;
- and
- a stiffness of between about 150 grams and about 750 grams according to the Circular Bend Stiffness Test.
A film for use as an interleaf between substrates, comprising:
- a foamed core layer comprising a polyolefin matrix with a plurality of micro-voids, wherein the foamed core layer defines a first side and a second side opposite to the first side;
- a first skin layer on the first side;
- a second skin layer on the second side;
- a basis weight of between about 60 gsm and about 80 gsm;
- a thickness of between about 90 microns and about 200 microns;
- and
- a stiffness of between about 250 grams and about 550 grams according to the Circular Bend Stiffness Test.
Dependencies are inferred from the claim text.