Process for spinning and/or twisting yarns, machine for spinning and/or twisting yarns and method to transform a machine for spinning and/or twisting yarns

A process for yarn spinning and/or twisting, in which a yarn runs between a yarn feeder towards a yarn picker, and comprising:

• a cursor located between at least one of the yarn picker or yarn feeder and a yarn guide, the picker being connected to a driver to rotate the yarn picker at a predetermined speed, in which a stretch of balloon is generated in a point located between the yarn feeder and the yarn picker because of the presence of a yarn twister comprising a ring having a diameter (DB) interactive with the cursor, wherein a value of the tension produced by the cursor is lower than in existing spinning and/or twisting processes for the same type of yarn and wherein a value of the rotation speed of the yarn twister and height of stretches of balloon (LB) is such that the yarn follows along a helical path with oscillating spire diameters (S) along a distance existing between the yarn guide and the cursor, such that the yarn, by operating the yarn twister, has a diameter generating two consecutive hyperboloid structures (E) forming a plurality of stretches of balloon (B) consecutive to each other that maintain an unchanged height throughout the process without recourse to apparatus elements in the yarn travel along the helical path between the cursor and the yarn guide.