Recyclable, high barrier sheet and tray
An improved sheet for making a three-dimensional article for holding food, such as a food tray, and a method of making a three-dimensional article. The sheet comprises a substrate and a laminate film. The laminate film may comprise a ceramic film and a copolymer layer. The copolymer layer can repair any cracks that occur in the ceramic film when the sheet is thermoformed. The food tray is considered a single material that is recyclable.
1. A retortable tray for holding food, the tray defining an interior and having an outer side and an inner (food contacting) side, the tray having a wall comprising:
a ceramic film layer, the ceramic film layer comprising a metal oxide coated polyolefin film;
one or more copolymer layers, at least one copolymer layer comprising a polyvinyl alcohol (PVOH); and
a substrate, the substrate comprising a polyolefin selected from the group consisting of polypropylene (PP), polyethylene terephthalate (PET), polyethylene (PE) and polystyrene (PS); wherein
the substrate comprises at least about 98 wt % of the tray; and
the at least one copolymer layer also comprises a water soluble adhesive component which sticks to the substrate.
2. The retortable tray of claim 1 , wherein:
the at least one copolymer layer also comprises a crosslinking additive.