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Paper Mill Eliminates Downtime on Calendar Roll with High Speed, High Temperature Spherical Roller Bearings from NSK

A major paper mill saves $480,000 over a five-year period after replacing standard spherical bearings with NSK's TL (Tough and Long Life) Series of spherical roller bearings.

NSK - Spherical Roller Bearings - TL Series

NSK’s TL Series of Spherical Roller Bearings are specifically designed for longer bearing life while operating under extremely high temperatures in paper machine dryer and calender applications.

Introduction

Calender rolls are subject to heavy loads and high speeds which can rapidly cause fatigue in spherical roller bearings. High heat of the application causes expansion of the bearing inner ring leading to cracks, ultimately resulting in bearing failure.

Success Story

Key Facts

A major paper mill was experiencing multiple inner ring crack on their calendar roll bearings
Standard spherical bearing was being used without carburized inner rings
12 failures annually
Excessive downtime and maintenance

Value Proposals

NSK investigated the failed competitor's bearings
Application review was conducted by NSK engineers
It was determined that the high heat in the application was causing the bearing's inner rings to crack

Solution

Replace standard spherical bearing with NSK TL Series spherical roller bearing

Product Features

Innovative chemical steel composition
Special heat treatment process
High strength inner and outer rings
Heat resistant to cracks
Greater resistance to hoop stress
Longer service life — more than twice that of conventional bearings operating under contaminated conditions
Greater dimensional stability under high temperatures (to 200^O C).

Cost Savings Breakdown

Before

Bearings: 12 @ $10,000

Downtime: 4 hrs @ $1,500/hr x 6

Cost/year

$120,000

$36,000

NSK Solution

Bearings: 6 @ $10,000

Downtime: Eliminated

Cost/year

$60,000

$0

Conclusion

Before NSK Solution: Total Costs: $156,000 x 5 years = $780,000
After NSK Solution: $60,000 x 5 years = $300,000
NET SAVINGS TO THE MILL OVER 5 YEARS = $480,000

About NSK's TL Series of Spherical Roller Bearings

NSK Tough and Long Life (TL) Series of Spherical Roller Bearings are ideally designed for the high temperature and high speed conditions of paper machine dryer and calender applications. With an innovative steel composition and special heat-treatment that offers superior dimensional stability and resistance to inner ring fractures, TL Spherical Roller Bearings provide utmost performance reliability, bearing life, and critically important machine up-time.

To learn more about NSK and its line of bearings specifically designed for the paper industry, visit: www.nskamericas.com