Intech Power-Core Thermoplastics Engineering Blog

Eliminating Noise , Malfunction, And Skidding In Sliding Door Rollers

Posted by Alexander Bartosch on Jan 2, 2014 3:15:00 PM

Of all the maintenance headaches associated with sliding doors, rollers cause most of the pain.

Bombardier Station Door Roller resized 600

Metal rollers, while still the default choice for heavy doors, require ongoing lubrication. And even when lubricated, metal rollers can eventually wear out the door track. Plastic rollers, which are too often made from common engineering thermoplastic materials, lack dimensional stability when exposed to temperature extremes and moisture. They also tend to creep, developing flat spots under static load.

When poorly designed or maintained, both metal and plastic rollers can also be noisy. In the case of metals, the noise occurs because of the metal-on-metal contact with the track. In the case of plastics, the dimensional changes and flat spots make for a rough, noisy ride.

We’ve been able to address the most common pain points associated with sliding door rollers by combining Power-Core™ materials with high-end roller bearings. These hybrid rollers have started to appear in a variety of sliding doors, including ones with

  • High-cycle requirements
  • Heavy loads
  • Demanding operating environments

These applications include cargo van doors, mall security doors, machine tool doors and more. Power-Core rollers have a number of advantages over both metals and other plastics in sliding door applications:

  • What goes around stays round. Power-Core produces highly concentric rollers that stay that way in use. The concentricity comes from precision machining of roller surfaces. And the dimensional stability is an intrinsic material property. Unlike most polymers, Power-Core does not swell if exposed to moisture. Its also stable across a wide operating temperature range of - 40 to 80ºC.
  • No flat spots. Power-Core features an entirely crystalline molecular structure that makes it more resistant to creep that results in flat spots when rollers are statically loaded over time.
  • A nice quiet ride. Power-Core rollers can damp vibration more effectively than metals. Power-Core also exhibits lower rolling resistance than metals. Taken together, these two factors result in sliding doors that operate smoothly and quietly.
  • Keep on rolling. Power-Core rollers eliminate the metal-on-metal wear that can prematurely end of the life of metal sliding door rollers and tracks. And Power-Core needs no lubrication to keep rolling.

For more information on sliding door applications—including load capabilities and design tips—read our sliding door white paper.Overmolded Plastic Roller Alternative

Dowload Your Sliding Door Whitepaper

Tags: roller design, roller bearing, Heavy Duty Rollers, over molded rollers, sliding door hardware, van door rollers, train door rollers, Acetal rollers, UHMW rollers, Neoprene Rollers, Nylon Rollers

Combating vibration, shaft bearings are only as good as their grease

Posted by Simon Barrell on Mar 16, 2010 4:02:00 PM

Intech Power-Core™ guide rollers and iCamFollowers™ absorb shock and vibration and their life is typically calculated for 100 million cycles, a performance relying in part on longevity of the roller bearings installed inside the plastic tires. Tests have found that degraded lubrication is the leading cause of bearing failure.

In harsh environments with high shock load frequency, combined with high humidity, some grease types can liquefy, then this will cause leakage from the bearing seals or can produce an added churning-friction effect on the bearing. As a result, in high speed applications, the operating temperatures will rise significantly, compounding the breakdown of the grease properties and resulting in premature bearing failure.

We have identified a new type of lubricant to improve our rollers resistance to shock and vibration by providing lubrication to the bearing when operating under extreme conditions. The grease, NLGI No. 2, has shown a consistent mechanical stability and less churning or deterioration than other lubricants.

We have been able to apply this newly acquired knowledge in a case of premature bearing failure in guide rollers used in a train sliding door in Florida. Exposure to high frequency vibration and high humidity caused a bearing failure while the plastic tire remained intact. By regreasing the guide roller bearings with the NLGI No. 2 grease, we have been able to better match the expected life of both the plastic tire and the bearings.

Intech Corporation is constantly striving to improve its products and certainly the discovery of this grease’s properties helps our customers extend the life of our rollers and bearings in shock and vibration applications.

Cam follower for packaging application 

 

 

 

 

 

 

 

 

Cam follower for packaging application

 

Concave, v-shaped, flat tire rollers

Concave, v-shaped, flat tire rollers

 Intech Rollers for High Security Door

Intech Rollers for High Security Door

Tags: cam followers, roller bearing, shock load, vibration, roller life, plastic tires, bearing failure, grease, lubrication