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Conveyor Belt Tensioning

Courroies à assemblage rapide ERO Joint

Determining and adjusting the initial tension of PVC, PU and Silicone Conveyor Belts with textile wefts (plies)

  • Conveyor Belts are designed for conveying applications.
  • During initial installation, tension adjustment is essential to ensure optimum operation of your system.
  • Conveyor belts are made up of textile weft and PVC or PU coating on 1 or 2 sides.
  • The type of fabric (polyester, cotton, etc.), the number of plies and the belt width all influence the initial tension.
  • Textile pleated belts are generally made of polyester weft (plies). The number of plies varies from 1, 2 or 3.
  • The elongation tension at 1% corresponds to the value in Newton per mm of width required to elongate the belt by 1%
  • Ex = 8 N/mm To elongate a belt by 1% of its length, a load of 8 Newtons per mm of width is required
  • The greater the number of plies, the greater the value of 1%
The initial tension value is expressed in % and is generally between 0.1 and 0.5%
% of tension
Width up to1000 mm 0.1
Narrow width (- 150 mm) 0.5
Elongation at 1% greater than 15 N/mm 0.2
Elongation at 1% less than 5 N /mm 0.4

Determining and adjusting the initial tension of monolithic Conveyor Belts without textile wefts (plies)

  • Monolithic belts have no textile weft, only a polyurethane (PU) layer
  • Elastic belts are mainly used for applications with a fixed center distance (no mechanical tensioning system).
  • Shore A hardness, thickness and width have an influence on initial installation tension.
  • Monolithic belts are joined endlessly according to a manufacturing dimension (length L0 at rest)
  • Length L1 corresponds to the length of the belt with tension (belt under tension on the conveyor).
  • To obtain the LO dimension, deduct the initial % elongation of the belt, generally referred to as pre-tensioning.
  • Example: for a tensioned length of 1000 mm with an initial elongation of the belt of 5%, we obtain a manufacturing dimension of 950 mm (1000 - 5%)
  • Monolithic belts are generally short, less than 10 meters

The initial tension value is expressed in %, and is generally between 0.2% and 5%

Shore hardness from 65 to 85 shore A (Max length = 3000 mm)
Width 10 to 100 mm Width 100 to 399 mm Thickness 400 to 750 mm
Thickness 0.5 to 0.9 mm 6 to 10 % 2 to 6 % -2 %
Thickness 1 to 1.9 mm 2 to 6 % 2 to 4 % -1 %
Thickness 2 to 3 mm Thickness 2 to 3 mm 0.5 to 1 % -0.5 %
Shore hardness from 86 to 100 shore A (max. length = 10000 mm)
Width 10 to 100 mm Width 100 to 399 mm Thickness 400 to 750 mm
Thickness 0.5 to 0.9 mm 2 to 4 % 1 to 2 % -1 %
Thickness 1 to 1.9 mm 1 to 2 % 0.5 to 1 % -0.5 %
Thickness 2 to 3 mm 0.5 to 1 % 0.2 to 0.5 % -0.2 %

The % voltages indicated are given for information only, it is necessary to make a precise calculation taking into account the load on the shaft to determine the stress on the axes or bearings.

Methodology for applying tension values

  • Make a no-load mark (without tension) 1000 mm long on the belt
  • Apply tension from 0.1 to 0.5 %, depending on the belt size
  • Move the tension roller to lengthen the mark
  • The initial mark will lengthen to 1003 mm
    (for wide belts, it may be advisable to measure on both sides to avoid too great a difference in tension, which would lead to poor belt guidance).
Méthode de réglage et tension des bandes transporteuses

Data and tension values are given for information only. Tanals cannot be held responsible for any misinterpretation or misuse.

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