T A P I OT A P I O®® RQP – Roll Quality ProfilerRQP – Roll Quality ProfilerT A P I OT A P I OTechnologiesTechnologies
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Tapio RQP
Roll Quality Profiler
T A P I OT A P I O®® RQP – Roll Quality ProfilerRQP – Roll Quality ProfilerT A P I OT A P I OTechnologiesTechnologies
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Tapio RQP: 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 timesevery second.
T A P I OT A P I O®® RQP – Roll Quality ProfilerRQP – Roll Quality ProfilerT A P I OT A P I OTechnologiesTechnologies
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High skewness increases breaks on a print machine
Skewness (max-min) of hardness profile
No
of
bre
aks
Smooth hardness profile is of great importance for print houses
T A P I OT A P I O®® RQP – Roll Quality ProfilerRQP – Roll Quality ProfilerT A P I OT A P I OTechnologiesTechnologies
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Profile resolution vs. measurement speed
1 m/s, 1measurement every 10 cm
0.5 m/s, 1measurement every 5 cm
0.1 m/s, 1measurement every cm
Typical
Detailed
Fast
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Example of a bad hardness profile
High Max-Minvalue causes tension control problems on a print machine.
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Web width in the paper machine
Front edge Back edge
Paper machine
Customer rolls
Soft roll edge is a typical hardness profile problem
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Tense areas: - Increase web breaks- Increase paper waste
Local faults in hardness profile
T A P I OT A P I O®® RQP – Roll Quality ProfilerRQP – Roll Quality ProfilerT A P I OT A P I OTechnologiesTechnologies
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Slack areas: - Increase web breaks- Increase paper waste
Local faults in hardness profile
- Slack area found10cm from theroll edge-Width 2 cm,requires high resolutionmeasurement
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Roll Hardness Profile, z-direction
Example of hardnessprofile in z-direction !Hardness increase towards the center ofthe roll. Measurement does not damage the roll.
T A P I OT A P I O®® RQP – Roll Quality ProfilerRQP – Roll Quality ProfilerT A P I OT A P I OTechnologiesTechnologies
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Automatic vs. Hand Held UnitWhite line: Manual measurement, speed 20cm/sec.
Red line: Automatic measurement, accelerating.
Speed only effects the resolution, not level of values !
T A P I OT A P I O®® RQP – Roll Quality ProfilerRQP – Roll Quality ProfilerT A P I OT A P I OTechnologiesTechnologies
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Tapio RQP – Complete System
1. Tapio RQP system 2. Tapio RQP is portable.
3. Tapio RQP uses tablet-PC. 4. Tapio RQP measuring head.
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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.
-Roll hardness profiles are easily available for further use in mill system etc.
- Hardness measurements in z-direction are possible.
