PROdry Technology Inc.

PROdry image

Example 1	Edge Damage
Example 2	Circumferential Groove
Example 3	Multiple Surface Flaws

Yankee Topography

PROdry Technology employs high-speed non-contact sensors coupled with proprietary data acquisition software to accurately map and display the surface of the Yankee dryer, either while making paper or with the sheet off. The result of this measurement is a series of dryer cross-sections similar to the one shown at the right. Thermal distortions and small surface imperfections can be clearly identified as to their size and exact location on the dryer.

Multiple plots can be combined to produce a contour map of the dryer. The mill can then use this data to determine grind schedules and repair strategies. Operating regimes can be developed which minimize thermal distortions and improve crepe blade life.

Distortion maps produced in conjunction with infrared images of the dryer are particularly revealing. The PROdry topography system is also capable of measuring dryer "head tilt" both on the run and without a sheet on the dryer. ("Head tilt" is an indicator of head/shell joint crevice corrosion, a phenomenon which can degrade the safety of a cylinder and shorten its useful life considerably.)