Tapio RQP Roll Quality Profiler.

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Presentation transcript:

Tapio RQP Roll Quality Profiler

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.

Smooth hardness profile is of great importance for print houses

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

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

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

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

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

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

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

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.