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TAPIO® RQP -Tool for Paper Roll Hardness measurementTAPIO RQP – ROLL QUALITY PROFILERTAPIO Roll Quality Profiler is designed for fast and accurate measurement of paper roll and machine roll hardness profile. Hand-held measurement device includes hardness measuring unit and distance encorder. Paper reels with non-uniform hardness profile may cause problems when printed or converted. RQP is the fastest and the most accurate system to detect reels that need to be excluded in printing or converting processes.  Tapio RQP: Paper Roll Hardness Measuring Principle The Measuring principle is to launch an impact body by spring force against the test surface on which it rebounds. Velocity and distance are measured and processed to form the hardness profile. RQP measures 10 times every second. Smooth hardness profile is of great importance for print houses 
Profile resolution vs. measurement speed  >> Click for a graph about local faults in hardness profile and see how High Max-Min value causes tension control problems on a print machine. Soft roll edge is a typical hardness profile problem! Web width in the paper machine >> Another example of a bad roll hardness profile >> Yet another example of a bad roll hardness profile Roll Hardness Profile, z-direction
Automatic vs. Hand Held Unit Speed only effects the resolution, not level of values ! Conclusions: -Uneven paper roll hardness profile is a major factor for a web break at the printing plant. -RQP is the fastest and the most accurate system to detect reels that need to be excluded in printing or converting processes. -RQP high resolution hardness measurement detect narrow slack and tense areas. -Paper Roll Hardness measurements in z-direction are possible. -High Max-Min value causes tension control problems on a print machine. Paper roll hardness profiles are easily available for further use in mill system etc. >> More about Roll Quality Profiler >> Watch the whole RQP presentation |
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