What is torsion and how do you calculate it? The general study of torsion is complicated because under this type of request the cross section of a part in general is characterized by two phenomena:

  1. Tangential stresses appear parallel to the cross-section. If these are redecorated by a vector field their flow lines "circulate" around the section.
  2. When the above stresses are not properly distributed, which always happens unless the section has circular symmetry, sectional wings appear that cause the deformed cross sections.

As any dedicated spinner would know and those who have started to study the manufacture of yarns intended for the construction of textiles, they know in advance that in order to be able to spin a certain amount of fibers with a certain length, it is necessary to apply a necessary number of twists for the fibers to come together, with inner fiber cohesion (fibers have to bind to others with mechanical help); this cohesion is built upon in each of the different existing fibers and helps the fibers to join with each other throughout the finished thread. This means that before looking for an effect by twisting a thread on a garment it is essential to apply twists to the short fibers for the construction of the threads, otherwise it would make it difficult or nearly impossible to manufacture them.

The main object of applying twists to the wicks and threads during spinning is to provide them with the necessary resistance for handling and that these can be used in different applications.

It is understood as torsion, the action that binds a set of fibers, by providing them with a certain amount of turns in the direction of their longitudinal axis, and as a consequence the portion of fibers acquires a cohesion and consistency thus causing greater resistances and overall thread strength, the degree will depend on the angle of inclination that forms the coil that binds to the fibers, but you have to be careful because an excess application of torque and you will have broken fibers and all of its resistance would be lost.