Polishing doctor blade with diamond abrasive particles for a calendering roll

In a calendering apparatus for providing a smooth surface to paper, which apparatus comprises:

• A. a metal calendering roll coated with a thin layer of carbide containing materials which deteriorate when faced with abrasive paper coating materials, the abrasive action of a cleaning doctor blade, and a corrosive environment and must be resurfaced periodically;
• B. a resilient pressure roll;
• C. means to press the resilient pressure roll and the metal calendering roll against each other to form a nip;
• D. means to continuously pass a web of paper through the nip;
• and
• E. means to provide heat to the surface of the metal calendering roll,
• the improvement which comprises a polishing doctor blade positioned against the circumferential surface of the metal calendering roll to resurface the roll while in operation, comprising a working surface containing diamond abrasive particles.