Papermaking apparatus with variable pulse turbulation blades

摘要

Papermaking apparatus is disclosed having variable dewatering devices with moveable elements which engage the conveyor carrying paper stock and are adjustable to vary their operating characteristics. A variable pulse turbulation blade with an adjustable in-going angle is provided with a cam-operated adjustment device that maintains the blade height constant while adjusting the in-going angle to prevent fiber clumps and to provide the paper sheet with a more uniform consistency. The turbulation blade may have a plurality of flats disposed at different angles or multiple radii on its leading portion.