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
Example of hardness profile in z-direction!
Hardness increase towards the center of the roll. Measurement does not damage the roll.
Automatic vs. Hand Held Unit
Speed only effects the resolution, not level of values !
-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.
Original TAPIO RQP configuration
1. Tapio RQP system
2. Tapio RQP is portable.
3. Tapio RQP uses tablet-PC.
4. Tapio RQP measuring head.