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US 8,574,694 B2Granted
Packaging sheet with improved cutting properties
AssigneeCurwood, Inc.
InventorsJesten David Neill, Curtis Randolph Barr, Connie Louise Gherena, Dwight Dennis Redding
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Abstract
A non-oriented thermoformable packaging sheet having a rigid component layer comprising a blend of an aromatic polyester and a styrenic polymer, where the total amount of styrenic polymer present in the sheet relative to the total weight of the sheet is at least between 3.0% and 4.0% by weight. The packaging sheet has a thickness of at least 5 mil and a normalized impact strength of 0.16 ft*lbf/mil or less total energy as measured in accordance with ASTM D3763-08 test method.
Claims15
A multilayer non-oriented thermoformable packaging sheet comprising
- a first rigid component layer comprising a blend of an amorphous polyethylene terephthalate or glycol-modified polyethylene terephthalate and a general purpose polystyrene;
- a second rigid component layer comprising a blend of an amorphous polyethylene terephthalate or glycol-modified polyethylene terephthalate and a general purpose polystyrene;
- a coextruded film positioned between and affixed to both the first and second rigid component layers;
- wherein the total combined amount of general purpose polystyrene present in the sheet relative to the total weight of the sheet is at least 3% by weight;
- and
- wherein the sheet has a thickness of at least 5 mil and a normalized impact strength of 0.16 ft*lbf/mil or less total energy as measured in accordance with ASTM D3763-08 test method.
3 more elements
Dependencies are inferred from the claim text.