Polyester yarn is produced undyed or mass-dyed:
- 11,0; 14,5; 15,3; 16,7; 22,0 tex single untwisted in cops on cylindrical patrons;
- 33,0; 50,0; 83,0; 93,5; 110 tex doubled with protective twist 30-60 rev./min. on cylindrical patrons;
- In the range of 28÷38 tex and 83,0÷93,5 tex with twist 500 (+30;-20) rev./min. or 360±30 rev./min. in single-cone cross wound bobbins on a cylindrical patron.