What are paper dryer doctors and why are they used?

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A dryer doctor is basically a long beam that extends across the face of the dryer shell, holding a scraping blade against the dryer surface.

Dryer doctors have a number of purposes: sheet shedding, dryer surface cleaning, threading, and air handling and control. Paper dryer doctors are often overlooked in the papermaking process, but they need proper attention to maintain efficient dryer operation. Important factors include doctor blade material, holders, doctor beam design, oscillation, alignment, and loading.


Source: Kadant

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