Testing was performed on card slivers because of the intimate blend between the two bales composing the mix at this stage. As expected, sugar contents and highspeed stickiness detector readings on the mixes indicated slight to moderate stickiness. During the processing of the 17 mixes, sticky deposits were noticed on the textile equipment, as shown in Figs. 2 to 4. Figure 5a shows average high-performance liquid chromatography results obtained on the 17 mixes for the fiber, the flat waste, and the residues collected on the draw frame and the drawing zone of the ring spinning frame. In this figure, the high performance liquid chromatography results are
normalized, the base being the high-performance liquid chromatography results on the fiber. It shows that trehalulose content is always higher in the residues collected than on the original fiber while the other sugars are not. The same behavior was observed in rotor spinning (Fig. 5b).
Fig. 5. Normalized high-performance liquid chromatography (HPLC) results averaged for fiber and flat waste on 17 mixes and residues collected from the draw frame and drawing zone of the ring spinning frame (a) and from the draw frame of the rotor spinning frame (b). Base used for normalization was HPLC results from fiber. A, card flat; B, draw frame - drafting zone; C, ring spinning frame - back rubber rolls; D, ring spinning frame - back steel rolls; E, ring spinning frame - belt; F, ring spinning frame - center rubber rolls; G, ring spinning frame - front rubber rolls; H, ring spinning frame - front steel rolls; I, rotor spinning frame - face plate; J, rotor spinning frame - feed table; K, rotor spinning frame - rotor groove; L, rotor spinning frame - rotor housing; M, rotor spinning frame - rotor ledge; N, dust test.

Among the sugars identified in contaminated cotton, only trehalulose exhibits higher concentration in the residues. Coefficients of correlation between the logarithms of the percentage of each individual sugar, expressed as a percentage of total sugars identified on the fiber, and the percentage of each individual sugar, expressed as a percentage of the total sugars on the flat strips and residues collected, are shown in Table 4.

Table 4. Coefficients of correlation (r)between the logarithms of sugar content on the fiber and on the flat strips and residues collected on textile equipment. Specific sugars (fructose, glucose, melezitose, sucrose, and trehalulose) are expressed as a percentage of total sugars. Codes denote: A) card flat; B) draw frame – drafting zone; C) ring spinning frame - back rubber rolls; D) ring spinning frame - back steel rolls; E) ring spinning frame - belt; F) ring spinning frame - center rubber rolls; G ) ring spinning frame - front rubber rolls; H) ring spinning frame - front steel rolls; I) rotor spinning fframe - face plate; J) rotor spinning frame - feed table; K) rotor spinning frame - rotor groove; L) rotor spinning frame - rotor housing; M) rotor spinning frame - rotor ledge; N) dust test.