Page 286 - Handbook of Properties of Textile and Technical Fibres

260 Handbook of Properties of Textile and Technical Fibres

Mean CV%
Bales 26.84 7.89
CF 26.24 5.23
Card 28.55 3.86
Draw 33.55 4.98
SL 34.15 4.39
Comb 38.30 4.36

50 Combed sliver
Relative frequency (%) 30 Chute feed fibers
40
Superlap
Finished draw sliver
20
Card sliver
10

20 0 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 Cotton bales
HVI fiber strength (g/tex)
Figure 7.15 Distributions of fiber strength in different processing stages (ring-spun combed-
yarn process).

• On carding, another substantial reduction in the variability of fiber strength was observed
(31% in the carded-yarn process and 26% in the combed-yarn process).
• The above results indicate that on carding, the total cumulative reduction in the variability
of fiber strength was about 54% for the carded-yarn process and it was 51% for the
combed-yarn process.
• After drawing, variability in fiber bundle strength tends to be stabilized.
The above trends were observed in many spinning mills around the world in which
Dr. Elmogahzy had the opportunity to work with. Again, one can easily attribute the
above results to the simple fact of crimp and nep removal and better alignments in
the fiber beards, particularly after drawing and combing. However, the fact that the
mean values obtained at the latter processes approach the levels of the mean values
of single-fiber strength observed in numerous studies (Hebert et al., 1995; Sasser
et al., 1991; Thibodeaux et al., 1998; Xiaoliang et al., 2003; Cui et al., 1999;
Hosseinali, 2012; Frydrych, 1995; Militký et al., October 3e6, 2004) should draw
the attention to the complex subject of relating single-fiber strength to bundle strength.
Indeed, one can imagine that a study on the relationship between these two parameters
for drawn or combed sliver samples can shed a great deal of light on the nature of this
relationship.

7.16 The spinning process

The spinning process is the process in which cotton fibers are consolidated into
yarn. The most commonly used spinning systems are traditional ring spinning and