Process and equipment for bulk-texturing and simultaneous interlacing of thermoplastic yarns, using heating fluids

Device for carrying out a process for bulk-texturizing and simultaneous interlacing of continuous multifilament, substantially stretched yarns having a shrinkage not lower than 9%, comprising a plurality of tubular chambers for the treatment of single yarns or a plurality of yarns, said tubular chambers being fitted with one or more nozzles for the inlet of a steam jet in a direction that is transverse with respect to the direction in which the yarn is advanced, said tubular chambers having a length comprised between 10 and 100 cm and being open at both ends for the passage of the yarns, the device being further fitted with yarn-guide nozzles for the inlet and outlet of the yarns, said yarn-guide nozzles being placed axially with respect to the tubular chamber and having an internal diameter less than the internal diameter of the tubular chamber in order to keep the yarn or yarns in a central axial position within the tubular chamber, and wherein the device further comprises steam chambers for inleting steam through said nozzles for the inlet of a steam jet at controlled pressure and steam discharge chambers connected to said tubular chambers.