PURPOSE: To provide the subject device not requiring a pressing mechanism and not forming sliding marks on the surface of the drum by forming doctor blades applied to the surface of the mirror surface cast coater drum plated with chromium out of ultrahigh mol.wt. polyethylene, etc.

CONSTITUTION: In a doctor device to be applied to a chromium-plated mirror surface cast coater drum used for producing paper, the doctor blades 4 of the doctor device 5 are made of ultrahigh mol.wt. polyethylene or fiber-reinforced ultrahigh mol.wt. polyethylene. The doctor blades 4, 4 are dividedly disposed on the surface of the cast coater drum 2 so as to remove a coating solution 3 in a prescribed width from the more inner sides than parts contacting with both the ends of a minimum wide coated paper sheet 1 toward both the axial ends of the drum. An oscillation means 6 for reciprocatively moving the doctor blades 4 in the axial direction of the drum is disposed, thereby permitting to effectively remove the excessive coating solution without forming sliding marks on the surface of the cast coater drum 2 and further to coat raw paper sheets having various widths without stopping the operations.