1. Tapio RQP
Roll Quality Profiler

2. 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 times
every second.

3. Smooth hardness profile is of great importance for print houses

4. Profile resolution vs. measurement speed
Fast
1 m/s, 1measurement every 10 cm
Typical
0.5 m/s, 1measurement every 5 cm
Detailed
0.1 m/s, 1measurement every cm

5. Example of a bad hardness profile
High Max-Min
value causes
tension control
problems on a
print machine.

6. Soft roll edge is a typical hardness profile problem
Paper machine
Customer rolls
Front edge
Back edge
Web width in the paper machine

7. Local faults in hardness profile
Tense areas: - Increase web breaks
- Increase paper waste

8. Local faults in hardness profile
Slack areas: - Increase web breaks
- Increase paper waste
- Slack area found
10cm from the
roll edge
Width 2 cm,
requires high
resolution
measurement

9. Roll Hardness Profile, z-direction
Example of hardness
profile in z-direction !
Hardness increase
towards the center of
the roll. Measurement does not damage the roll.

10. Automatic vs. Hand Held Unit
White line: Manual measurement, speed 20cm/sec.
Red line: Automatic measurement, accelerating.
Speed only effects the resolution, not level of values !

11. Tapio RQP – Complete System
2. Tapio RQP is portable.
1. Tapio RQP system
3. Tapio RQP uses tablet-PC.
4. Tapio RQP measuring head.

12. 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.
Hardness measurements in z-direction are possible.
Roll hardness profiles are easily available for further use
in mill system etc.