Air Washed Doctor Board System
Doctor boards positioned before and after the point of cut, improve cut quality and increase speed on dead knife sheeters. The doctor board positioned before the knife is adjustable, permitting the approach angle of the web to be varied, depending on the thickness of the material. This innovation has eliminated “beading” along the cut edge of low density board, significantly improving cut quality on conventional sheeters.
The doctor board after the knife is washed with air, which creates a vacuum that peels the leading edge of the sheet away from the knife revolver and directs it into the mouth of the delivery system. This design increases line speed by up to 100 fpm (30 mpm) on short cut offs and light weight materials. In addition, air flow to the after knife doctor board can automatically be compensated for speed changes, eliminating the need for Operator adjustment.