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Chesterton® PLS the Choice for Paperboard Plant Reduction Gear


Case study APAC0036 – Chesterton products – Chesterton EPS

Chesterton - Global Solutions, Local Service



Conventional lip seals in paperboard plant reduction gear often leak due to excessive shaft wear. This can lead to contaminated paper products that therefore become unfeasible and waste time and profits. This client’s goal was to eliminate the contamination of products by eliminating oil leaks. Chesterton experts recommended the Chesterton ® PLS (Polymer Labyrinth Seal) and the client reported long-lasting results stretching three years, and also purchased e more of the seals to apply to other areas of their plant.

Products featured in the case study:

Chesterton® PLS



Conventional lip seals have oil leaks due to excessive shaft wear, contaminating paper products.

Root Cause

Continuous use of high friction and short-lasting rubber oil seals degrades the shaft causing oil leaks.


Eliminates contamination of paper products from oil leaks.

Reduction gear.



Application is a Paperboard plant Center drum reduction gear 1137 rpm


NOK oil seal TC type 110 x 140 x 14 mm 2 rings 130 x 160 x 14 mm 2 rings


Chesterton PLS1 110 x 140 x 14 x 8 mm 2 sets 130 x 160 x 14 x 8 mm 2 set

Chesterton® PLS—Polymer Labyrinth Seal

Made from Chesterton’s proprietary polymer material technology, the Chesterton, patent-pending Polymer Labyrinth Seal (PLS) is a non-contact bearing seal designed to provide protection for pumps, motors, gearboxes, and other rotating equipment in splash applications. The unique design eliminates fretting caused by conventional lip seals, and helps increase bearing and gearbox life by extending the mean time between equipment repairs.

Chesterton® PLS


Client Reported

No leakage after installation in June 2018. As of July 2021, 25 sets of PLS are used in the following applications:

  • Reduction gear of high-pressure feeder
  • Reduction gear of Steaming Vessel
  • Caustic hot water pump
  • Cleaner pump


Oil seal replacement cost twice a year

$600 x 2 = $1,200 / year

Total Savings = $1,200 per year

Chesterton PLS with flange.

About Us

Chesterton global solutions, local service

Chesterton® is a world leader in helping process industry companies and manufacturers improve the reliability and efficiency of their rotating, stationary, and fluid power equipment platforms. We are known across a wide range of industries for our award-winning pump and valve sealing solutions, applications expertise, equipment maintenance and wear-prevention products, and knowledgeable hands-on local service​.

Mentioned in this case study:

Kanamori Gihan

Exclusive Distributor of Chesterton products – Japan

® Registered trademark owned by A.W. Chesterton Company
Case Study APAC0036 – Issued 08/21

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