Anti-contamination coating for decurler indenting shaft

摘要

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.

主权项

1. A printing apparatus, comprising:
a sheet path for moving a print substrate; a decurling station positioned along the sheet path, the decurling station comprising:
an indenting roller mounted for rotation around a first longitudinal axis thereof and on a first side of the sheet path, the indenting roller comprising an indenter shaft and an anti-contamination coating disposed on the indenter shaft, wherein a drop of aqueous ink exhibits a sliding angle of from about 18° to about 30° and a contact angle of greater than about 40° with a surface of the anti-contamination coating; andan elastomeric roller mounted for rotation around a second longitudinal axis thereof and on a second side of the sheet path, wherein the anti-contamination coating comprises a reaction product of more than one triisocyanates and a perfluoropolyether diol compound comprising an ethoxylated spacer.