Packaging sheet with improved cutting properties
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.
1. 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.
2. The packaging sheet of claim 1 wherein the first and second rigid component layers are each an outer layer.
3. The packaging sheet of claim 1 wherein the first rigid component and/or the second rigid component have further layers disposed thereon.
4. The packaging sheet of claim 1 wherein the coextruded film comprises a barrier component.
5. The packaging sheet of claim 4 wherein the barrier component is a layer of ethylene vinyl alcohol copolymer.
6. The packaging sheet of claim 4 wherein the barrier component is a layer of ethylene vinyl alcohol copolymer positioned between two layers of tie material.
7. The packaging sheet of claim 4 wherein the barrier component is a layer of ethylene vinyl alcohol copolymer positioned between two layers of nylon or nylon blend.
8. The packaging sheet of claim 1 wherein the total amount of general purpose polystyrene present in the sheet relative to the total weight of the sheet is between 3.0% and 17% by weight.
9. The packaging sheet of claim 1 wherein the total amount of general purpose polystyrene present in the sheet relative to the total weight of the sheet is between 3.0% and 15% by weight.
10. The packaging sheet of claim 1 wherein the total amount of general purpose polystyrene present in the sheet relative to the total weight of the sheet is between 3.0% and 12% by weight.
11. The packaging sheet of claim 1 wherein the sheet has a thickness of between 5 mil and 15 mil.
12. A package for a product wherein the package comprises the packaging sheet of claim 1 .
13. The package of claim 12 wherein the packaging sheet is thermoformed.
14. The package of claim 12 wherein the packaging sheet is thermoformed into a cup, a tub, a bucket or a tray.
15. The package of claim 12 wherein the product comprises syrup, cream cheese, condiments, personal care item, medication, liquid detergent, oil, pate, pet food, glue, beverage or confections.