| abstract |
A thermoplastic sheet includes a thermoplastic substrate; and a mask applied on a surface of the thermoplastic substrate; wherein the mask comprises a polyamide, a polyester, or a combination comprising at least one of the foregoing; wherein the thermoplastic sheet and the mask do not discolor after thermoforming the thermoplastic sheet. A method of thermoforming an article comprising: extruding a thermoplastic sheet; applying a mask to a surface of a thermoplastic sheet, wherein the mask comprises a polyamide, a polyester, or a combination comprising at least one of the foregoing; shaping the thermoplastic sheet to form the article, wherein the mask remains in contact with a surface of the thermoplastic sheet during shaping; and removing the mask from the surface of the article after cooling the article. |