**2. Textile processes**

The classical textile spinning process is based on Figure 1. First of all, staple fibers highly compacted in form of bales are opened with the help of a bale opening line. Moving through a coarse and a fine opener, the size of fiber tufts is reduced to be able to feed the carding machine chute. The chute delivers a lap of fibers to the carding machine feed rolls.

**Figure 1.** Scheme of classical textile process

In a second time, the carding machine, as shown in Figure 2, individualizes the fibers tufts and delivers the fibers in the form of a web. The web is then condensed in a form of sliver.

**Figure 2.** Carding machine

The sliver goes through a drawing frame and a roving frame which produces slivers which are drawn and twisted on a spinning machine, that is, ring spinning frame. The quality of the final product strongly depends on the efficiency of the carding operation. It can be noticed that this efficiency is strongly correlated to the quality and the evenness of both the fed lap and Variance Analysis and Autocorrelation Function for 2D Fiber Lap Statistical Analysis http://dx.doi.org/10.5772/61795 57

**Figure 3.** Drylaid needle-punched nonwoven line (Doc. ANDRITZ)

delivered web. An exact knowledge of the quality of these 2D textiles is absolutely necessary [1,16,17].
