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Most manufacturers who deal with calender rolls have also, unfortunately, encountered roll barring.
Roll barring leads to inconsistent paper quality -- variations in paper thickness, glossiness, strength, etc. This downgrade in quality leads to higher waste, downtime and costs for your production process. And as you can imagine, similar detrimental issues are heaped onto your customers.
When you eliminate barring, you get more consistency and less waste from your paper production line. Continue reading for 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 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 far from effective.
Bearing and housing removal must be implemented first. The bearing seats and the roll faces must be ground round and concentric.
To prevent damage to the bearings and housings, leave the removal process to the experts. When removal of bearings and housings is performed effectively, you get tighter tolerances when you grind your rolls. This means less maintenance, less machine downtime and, most importantly, more consistent production.
Roll barring presents a major obstacle to both consistency and quality control, which are key considerations for the paper industry.
"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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Lone Star Steel Company
The Problem - When the lone roll grinder at Lone Star Steel Company went down unexpectedly, there was really only one choice: call PRG. Fortunately, with a PRG facility just across the Arkansas border in Texarkana, that call was little more than a holler.
PRG's Solution - Read More...