STEEL CORD CONVEYOR BELT SPLICING
STEEL CORD CONVEYOR BELT SPLICE CONFIGURATIONS
1-step splice pattern (up to St 2000)
2-step splice pattern (St 2500 - St 3150)
3-step splice pattern (St 3500 - St 4500)
4-step splice pattern (St 5000 - St 7500)
5-step splice pattern (St 7800 - St 10000)
The diagrams show rectangular splices. Today, high class splices do not need a bias cut anymore. However, if your mobile vulcanizing press has an oblique design, you can still apply the bias shape.
The design of the optimum splice is a complex task. The cord diameter, the pitch, the butt end clearances, the bend zones, the belt edges and the shear stress properties of the core rubber and other parameters have to be considered.
Just as a very basic guideline for the splice design, there are some rules of thumb in the market:
- Step length of opposing cables: min. 100 x cable diameter,
- Rubber width between cables: min. 2 mm or min. 0,3 x cable diameter,
- Steel cord butt end gap: approx. 50 mm,
- No splice should contact two pulleys at the same time.
All sketches are not to scale!
Splice lengths as per DIN 22131:
The ISO standard 15236/4 additionally describes simple splice patterns called:
Fir Tree Splice
Organ Pipe Splice
Such designs should be used for lower utilized conveyor belts with high safety factors only.
For dimensioning of the conveyor belt strength, the reduced splice strength must be considered!