When: A die cap under load is subject to sever stress that can exceed plasticity limit. Using thermal shrinkage principle we apply a ring to the cap section with the aim to reduce its deflection under load and, as a consequence, the peak stress. Thanks to Shrinking Ring technology caps are more stable and their operating life can even double. Last, but not least, using a shrining ring it is possible to reduce the required die diameter and/or to give full guarantee to a die that normally would crack under load. Recommended: for all kind of aluminum alloys. Products: rail profiles