The method involves knitting individual threads (2) on a multichute knitting machine (1) and realizing thermal or chemical treatment in an enclosure (7). A deknitting is carried out on a knitted thread in a deknitting unit (4) with traction. The deknitted thread is reeled and beamed individually. Processing operation and fabrication operation are carried out on the individual threads with intermediate accumulation of the threads. An independent claim is also included for a processing line of threads implementing thread processing method.