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Tube Materials


The tube material and tube diameter determine the load capacity and operation of the conveyor rollers.The following section outlines the tube materials steel, aluminium and polymer, together with their advantages and disadvantages.
Roller Tubes

Steel

  • Best strength and flexural strength of all tube materials
  • Corrosion protection can be provided by zinc plating or the use of stainless steel
  • Sprockets and flanges can be welded onto the tube
Steel tubes used on Interroll conveyor rollers are manufactured in accordance with DIN EN 10305+1 and DIN EN 10305-3 with limited tolerances (as specified by Interroll).
Other versions: Tubes with grooves, tubes with flexible sleeves, rubberised tubes, surface-hardened tubes, brushed stainless tubes.
When belt conveyors are used, there is noise caused by the pared tube welds coming into contact with the belt.
Interroll therefore recommends that the plant constructor tests the relevant application.

Aluminium

  • Significantly lighter than steel tube
  • Corrosion-resistant
Aluminium tubes have slightly lower strength and only about one third of the flexural strength of steel tubes.
However, they weigh only 36 % of the weight of comparable steel tubes.
Aluminium tubes up to and including a diameter of 30 mm have anodised surfaces. Aluminium tubes with a diameter of 50 mm are not anodised and can therefore discharge electrostatic charges via the connection with the roller shaft.

PVC

  • Sound reduction
  • Highly impact-resistant
  • Lower weight
  • Corrosion-resistant
  • Easy to clean
Polymer tubes have a significantly lower load capacity compared with steel tubes with the same diameter.
On tubes with a diameter of more than 30 mm, the bearing assemblies are joined to the tube in a form-fit manner thus ensuring a completely secure seating.
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