From 20 to 38 days: How Hansol Paper doubled calender roll running time with CL-W

Stable calender operation and reduced maintenance interruptions are critical for maintaining efficient production. Recently at Hansol Paper’s Shintanjin CM1 in Korea, the adoption of Valmet Calender Roll Cover CL-W has brought clear results, with longer running intervals, improved durability, and more consistent performance.

Hansol Paper PM1

Hansol Paper is a leading paper manufacturer in Korea, with Shintanjin CM1 producing high-quality paper grades. In the calender, the mill was facing repeated roll cover damages, resulting in short running intervals of around 20 days. Frequent grinding was required to maintain performance, causing production interruptions and increased maintenance workload. Improving roll cover durability and maintenance efficiency became essential to ensure stable operation.

To achieve these targets, the mill engaged Valmet to identify a suitable solution. Valmet conducted an on-site assessment with a paper technology and roll expert. The Valmet Calender Roll Cover CL-W used in this application was manufactured at Valmet’s Laem Chabang Service Center in Thailand.

Given the demanding operating conditions, a roll cover with enhanced resistance to wear and mechanical stress was required. Valmet proposed the Valmet Calender Roll Cover CL‑W, designed to deliver highest possible wear resistance, strong load-speed durability and a long regrinding interval.

Valmet Calender Roll Cover CL‑W designed for demanding calender applications.

After utilizing the Valmet Calender Roll Cover CL‑W, we have seen a clear improvement in roll performance. The roll running interval has increased significantly, and we have not experienced any roll cover damages during operation.” Kim Dong Su, Maintenance Team, Part Leader, Hansol Paper Shintanjin mill, CM1.

The results: Longer runs, fewer disruptions 

The outcome of upgrade to Valmet Calender Roll Cover CL‑W was clearly seen in daily operation. No roll cover damages were observed, removing a key source of production disturbances. The grinding interval was significantly extended from approximately 20 days to up to 38 days, reducing the frequency of maintenance interventions and minimizing downtime.

As a result, the calender achieved improved reliability and stability, supporting more consistent production. With fewer unplanned shuts and reduced maintenance demand, the mill achieved more efficient and predictable operation.

Summary

Location   South Korea  
Customer target   Improved maintenance efficiency while enabling longer, more reliable production runs  
Solutions   Valmet Calender Roll Cover CL‑W  
Results  
  • No roll cover damages during operation
  • Grinding interval increased up to 38 days
  • Improved calender reliability and stability
  • Reduced maintenance workload and unplanned downtime  
Keywords   Roll cover, calender roll, paper machine, South Korea  

Technical data

  CM1  
Grade Thermal paper / printing and writing paper
Basis weight 44–200 g/m²
Design speed 1,200-1,300 m/min
Trim width at reel 5,050-5,220 mm
Production capacity 109,000 tpa

 

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