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Calender Roll Bearing Failures? Beat the Heat with the TL-Series from NSK

paper machine A paper mill was experiencing failures in their calender roll bearings.

September 2021 - Under the extreme and rapid heating of calendar rolls in paper making machines, the typical bearing will rapidly fail due to repeated hoop stresses. TL-Series Spherical Roller Bearings from NSK were created to dramatically increase service life and maintenance intervals, while dramatically reducing costs.

NSK CASE STUDY

INDUSTRY
PAPER, PAPERBOARD AND PULP MILLS

APPLICATION
CALENDER ROLL

COST SAVINGS
$377,225 (5 YEARS)

Using a competitor’s bearing without carburized inner rings, a paper mill was experiencing failures in their calender roll bearings. Due to inner ring cracking, the mill was experiencing 10 failures annually which required downtime for change outs and additional maintenance time.

KEY FACTS

  • Application: Calender roll (Country: USA)
  • End-product: paper
  • Number of machines: 1
  • Status: still in operation after 5 years
  • Problem: High bearing failure rate
  • Objective: Decrease change outs and downtime

VALUE PROPOSALS

  • NSK worked with the mill engineer building on successes that we have seen at mills with similar issues.
  • NSK investigated the application as well as inspected the competitor‘s failed bearings.
  • The use of carburized inner rings in NSK’s TL, Tough and Long Life Bearings, was suggested.
  • Bearings were installed and have run 5 years without failure.

PRODUCT FEATURES

NSK’s TL (Tough and Long Life™) Series of Spherical Roller Bearings are specifically designed for dryer rolls in papermaking machinery which operate in extreme high temperature conditions.

NSK’s TL Series of Spherical Roller Bearings NSK’s TL (Tough and Long Life™) Series of Spherical Roller Bearing.
  • Innovative chemical composition of steel.
  • Belongs to the Tough Technology™ Series.
  • Special heat treatment process.
  • High strength inner and outer rings.
  • Higher resistance to cracks.
  • Greater resistance to hoop stress.
  • Reduced fracturing of bearing inner rings.
  • Reduced downtime and maintenance costs.
  • Longer life – service life is more than twice that of conventional bearings operating under contaminated conditions.
  • Greater dimensional stability under high temperatures (to 200°C / 392°F).

To learn more, download the NSK Case Study (761k, PDF)

SOURCE: NSK

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