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Most manufacturers that deal with calender rolls also dealt with roll barring. When you have barring in your rolls, this issue leads to inconsistent products and often results in higher waste, downtime and costs for your production process, and also, results in similar issues for your customers.
When you eliminate barring, you get more consistency and less waste from your production line. Continue reading for an explanation on the science behind barring, the benefits of barring prevention and the best way to eliminate barring from your production line -- plus, a video that sums it all up!
Calender barring is a harmonic roll surface problem that affects the longevity of calender rolls and product quality, thus leading to excessive machine excessive downtime.
Traditional grinding methods are inconsistent and don’t work. For example, grinding rolls on bearings is a common practice to clean up rolls and try to reestablish the original specifications. However, this is not effective.
Bearing and housing removal must be implemented first. The bearing seats and the roll faces must be ground round and concentric.
For an unbiased appraisal of the condition of your bearings and housings, leave the removal process to the experts. Then, once the removal of bearings and housings is completed, the bearing seat is ground round and concentric to the roll face. This means less maintenance, less machine downtime and most importantly, more consistent production.
Click the button below to watch a short, informative video on how to prevent barring and achieve tighter tolerances from your production line.
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"PRG is an excellent strategic partner with their experienced and professional people. We know we can depend on PRG for high quality work and excellent service. Such a high comfort level is valuable to us."
-- David A. Robinson, Area Maintenance Supervisor -- Paper Mill, Wickliffe Paper Mill, NewPage Corporation
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The Problem - In 1989, Blandin started up their #6 paper machine line with two modern super calenders. Over time, barring created a wear pattern, leaving an impression on the finished sheets. At one point, the mill had to change chilled iron rolls every six weeks. The resulting downtime greatly affected productivity.
PRG's Solution - Read More...