Abstract: Provided is a printing apparatus that includes: a sheet path for moving a print substrate; a decurling station positioned along the sheet path and the decurling station. The decurling station includes an indenting roller mounted for rotation around a first longitudinal axis thereof and on a first side of the sheet path, and an elastomeric roller mounted for rotation around a second longitudinal axis thereof and on a second side of the sheet path. The indenting roller includes an indenter shaft and a an anti-contamination coating disposed on the indenter shaft, wherein a drop of aqueous ink exhibits a sliding angle of less than about 30° and a contact angle of greater than about 40° with a surface of the anti-contamination coating.

Abstract: The present invention provides an external lubricant composition for lead stabilized vinyl polymer. The external lubricant functions as both an external lubricant and a processing aid by speeding fusion and thus, obviates the need for a separate processing aid. The external lubricant comprises an effective amount for lubricating vinyl polymer of polyethylene having a Brookfield viscosity at a temperature of 150.degree. C. of between about 1000 and about 100000 centipoises and an acid number as determined by standardized titration of KOH of between about 1 and about 40.