SDL-CIRAD high speed stickness detector: pre-production version. Draft, technical manual

Frydrych Richard. 1999. SDL-CIRAD high speed stickness detector: pre-production version. Draft, technical manual. Montpellier : CIRAD-CA, 31 p.

Technical and research document
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Abstract : Over the last few years it has been noted that cottons from various origins induce a stickiness phenomenon during spinning and thus lead to considerable production losses (Hector & Hodkinson, 1989). Stickiness is primarily due to insect excretions, Aphis gossypfi (fig. 1. 1) and Bemisia tabaci (fig. 2), known as honeydew. These are composed of sugars (fig. 1.3) which give the cotton its sticky potential (Bourely, 1980; Hendrix & al, 1992 ). This honeydew is deposited onto the leaves (fig. 1.4) and onto the fibers of open bolls (fig. 1.5). The ginning process disperses the honeydew droplets in the fiber (fig. 1.6) and, by reducing their size, renders them difficult to detect with the naked eye. The honeydew cause various degrees of disruption during the spinning process (fig. 1.7). It increases irregularities in sliver and yarn (fig. 1.8), occasionally leading to yarn breakages, rotor clogging and machine shut-downs. Preliminary studies have shown that even in countries which suffer particularly from stickiness, a significant proportion of the harvest is uncontaminated. However, because no control system is in place to determine production stickiness, the entire production is labelled as "sticky cotton" and in consequence is subjected to systematic downgrading. It is therefore essential that the stickiness of the cotton produced is monitored and evaluated. It is becoming increasingly important to measure rapidly the sticky potential of cottons before they enter the spinning process as it is possible to reduce these sticky effects byappropriate means: mixing cottonsthat present different levels of contamination, reducing relative humidity in the premises (Gutknecht & al., 1988) or by various treatments. lubricants, washing, etc.(Perkins, 1993). Testing the stickiness of each bale requires a machine that is able to detect stickiness as rapidly as the analyses performed by HVI lines for other characteristics. To meet this challenge, CIRAD has developed a detection machine more rapidly than the SCT thermodetector(Frydrych, 1986). The machine is called the High Speed Stickiness Detector (Frydrych & al, 1994). Here, we present and describe the performance of this machine. (Résumé d'auteur)

Auteurs et affiliations

  • Frydrych Richard, CIRAD-CA-COTON (FRA)

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