MULTI-WALL PLASTIC SHEET HAVING AN INTERNAL PLASMA-ENHANCED CHEMICAL VAPOR DEPOSITION COATING AND PROCESS FOR MANUFACTURING THE SAME

摘要

A process for producing a coating on at least one interior surface of a multi-watl sheet is described comprising (a) providing a multi-wall sheet (1) comprising multiple hollow flutes (1a) between the walls of the multi-wall sheet; (b) introducing at least one gaseous mixture capable of plasma deposition into at least one hollow flute (1a) of the multi-wall sheet; (c) generating a plasma in the at least one gaseous mixture in the at least one hollow flute of the multi-wall sheet, and (d) allowing the plasma of step (c) to form a solid deposit (9) derived from the at least one gaseous mixture on the interior surface of the at least one hollow flute. A multi-wall sheet (1) obtainable by the above process is also described, including a multi-wall sheet having a plasma-enhanced vapor deposition coating (9) on the interior surface of at least one flute (1a) of the multi-wall sheet, wherein the coating has an average thickness not greater than 5 µm and a variation in thickness relative to the average thickness not greater than 1 µm.