T A P I O ® RQP – Roll Quality Profiler T A P I O Technologies 1 Tapio Technologies Oy All rights reserved/ Tapio RQP Roll Quality Profiler.

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Tapio RQP

Roll Quality Profiler

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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.

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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

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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

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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.

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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 !

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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.