Cores wound in bundles

Bundle stranding for a longer service life

chainflex® cables or cables with at least 12 cores are always designed with bundle stranding. This complex stranding ensures a longer service life with continuous movement in the energy chain.

What is bundle stranding? Corkscrew and core breaks can frequently occur in multi-core, stranded energy chain cables. Bundle stranding eliminates these problems thanks to its very complex, multi-stranded interior. Here, the stranded wire is first twisted with a special pitch length and the resulting core is twisted again to form single core bundles. In the case of large cross sections, this is done around a strain relief element. The next step is to re-strand these core bundles around a tension-resistant core, a real core element.

This multiple stranding of the core means that all cores change the inner and outer radius of the bent cable several times at the same distance. Tensile and compression forces are thus equalised around the high-tensile core element, which gives the stranded structure the necessary inner stability. This ensures that the stranding remains stable even under the highest bending stress.