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Introduction

A paper mill in the US  was facing frequent bearing failures on a Nip Roll. The bearing failed after just 1 year of service, which created a high cost of lost production together with significant maintenance issues.

NSK was consulted to investigate and found out that the bearing design and set-up were not appropriate. After the installation of NSK's recommended Spherical Roller bearing, no more failures occured.

Key Facts

  • Nip roll
  • Frequent paper roll issues due to bearing failures
  • NSK solution: Sphercial Roller bearing with improved clearance and interference fit together with set-up recommendations
  • Significant cost saving realised

Paper Rolls Paper Rolls
Spherical Roller Bearings - CAM Cage Spherical Roller Bearings - CAM Cage

Background Information

  • Sector: Paper
  • Application: Paper Rolls

  • Country: US
  • Problem: Frequent paper roll issues due to bearing failures

Value Proposals

  • NSK experts performed an Application Review revealing an inappropriate bearing design
  • NSK proposed a replacement with a Spherical Roller bearing utilising improved internal clearance and recommendations on shaft and housing fits to achieve this

  • After the installation of the new bearing and applying the changes to the application, no failures occured 
  • Significant cost saving could be realised as machine downtime and maintenance have been eliminated 

Product Features

  • Special dimension large size Spherical Roller Bearing
  • High load capacity, super durability and wear resistance

  • High surface finisf for high speed applications
  • Brass cage with large rollers for greater load capacity

Cost Saving Breakdown

Before Cost p.a. NSK Solution Cost p.a.
12 hrs downtime per failure occuring 2-3 times per year @ cost of 20.000 € per hr  600 000 €
Total Costs Before NSK Solution

Reference: SS-E-0022

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