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

Polymer-Steel Hybrids For Heavy-Duty Rollers For Rack Feeders

Posted by Alexander Bartosch on Mar 14, 2013 12:36:00 PM

Metal or plastic? In many load transmission applications, the choice will be clear-cut based on loads, lifecycle expectations and environmental conditions. There is, however, a third choice that involves both metal and plastic. Hybrid components that use a structural metal hub with a polymer load surface can offer the best of both worlds in load transmission applications. A good example can be found on a recent feeder rack application that uses a set of rollers made by casting our Power-Core™ material over a steel hub. The rollers, which measure between 250 and 500 mm across, had to withstand high static and dynamic loads. At the same time, they also had to do operate smoothly, in part to minimize frictional heating and in part to minimize noise.

Intech Highload Roller - Polymer CasterEarly in the project, it became clear that a hybrid solution would be the best way to meet all the application requirements. The steel hub provides the needed structural strength, while the Power-Core bearing surfaces reduce wear, frictional heating and noise in ways that all-steel rollers could not.

The right plastic. Power-Core isn’t the only polymer that can be used in applications like this one, but it emerged as the best one for a couple of reasons:

To learn more about Power-Core’s use in hybrid rollers, cam followers and other motion components, download our white paper “Enhancing Motion Systems With Plastics.”

 

Download Our White Paper

Tags: plastic rollers, Heavy Duty Rollers, load-bearing capacity, Rack Feeder Rollers, Rack Feeder Casters