Enhancing PM7 operational stability through on-site vibration analysis

When abnormal vibration was detected at the PM7 4P roll position, Jeonju Paper in South Korea needed to quickly determine the root cause to avoid the risk of escalating mechanical issues and unplanned maintenance. Understanding the source of the issue was important to maintain stable operation and support effective maintenance planning. To identify the most effective corrective action, Jeonju Paper engaged Valmet's specialists for an on-site technical assessment.  

Jeonju Paper Reference

From left to right: Anuchit Kamlangdee (Valmet), Lee Jin Chul (Jeonju Paper), Lee Sang Jun (Valmet)

On-site vibration analysis 

To identify the source of the vibration, Valmet combined local service expertise with specialized condition monitoring and vibration analysis expertise. Valmet roll service and vibration analysis specialist in Asia Pacific, Anuchit Kamlangdee, joined the local service team for the assessment. Together, the team conducted vibration measurements and a detailed assessment of the PM7 drive system.

By combining field service expertise with vibration measurement data, the team identified the universal joint as the most likely source of the vibration. Rather than relying on trial-and-error troubleshooting, Jeonju Paper received a clear diagnosis and a focused report and recommendation. Based on the findings, the mill replaced the universal joint to address the issue at its source.

Stable operation restored

Following the replacement, the vibration was eliminated and stable operation at the PM7 4P roll position was restored.

The on-site analysis enabled Jeonju Paper to make maintenance decisions with confidence and focus resources on the most effective corrective action. With a clear understanding of the root cause, the mill was able to eliminate the vibration and restore stable operation.

The case highlights how combining field service expertise with condition monitoring and vibration analysis expertise can help mills identify root causes, make informed maintenance decisions and maintain reliable machine operation.

Valmet's on-site vibration analysis provided clear and practical guidance for addressing the vibration at the PM7 4P roll position. Based on the findings, we implemented the recommended corrective action and restored stable machine operation.” LEE JIN CHUL, Maintenance Supervisor for PM6 & PM7, Jeonju Paper

Summary

Location South Korea
Customer target
  • Assess the condition and identify suitable corrective actions
  • Maintain stable machine operation and effective maintenance planning
Solutions Valmet specialist’s on-site technical assessment, vibration measurement and drive-system analysis and corrective-action recommendations
Results
  • The vibration was eliminated following replacement of the universal joint
  • Stable operation of the PM7 4P roll position was restored
  • Machine reliability and operational stability were improved
  • Demonstrated the value of Valmet’s on-site condition monitoring, vibration analysis, and troubleshooting expertise
Keywords Field service, condition monitoring, vibration measurement, vibration analysis, troubleshooting, roll service, South Korea  

 

Technical data

  PM7
Grade Newsprint & Fluting
Basis weight 35-55 g/m2
Design speed 1,700 m/min
Trim width  7,960mm
Capacity 270,000 tpa

 

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