Cotton Fiber white fly honeydew contamination and its effect towards Neps, and Fiber preparation
Cotton fiber is frequently found to be contaminated by ‘Honey dew’ excretion created by white flies.
These are normally found on African species more due to conditions under which Cotton there is grown. African Cotton is almost all grown non-irrigated and in vast areas in savanna stretched regions. These areas have a large number of white flies which love cotton buds. Their secretion contains a sticky substance called ‘Honey dew’.
Nothing is more disturbing to the Spinning personnel than ‘Honey dew’. Fibers stick together, they are difficult to open and clean, as well as tend to be easily damaged during the mechanical process in blowroom, and carding. Mechanical forces will break fibers and create more neps as a result, as well as fiber fly in the spinning process.
Fiber immaturity in Cotton and its correlation towards neps
Every ‘spinner’ knows the implications of immature fibers in cotton. In practical terms immature fiber content is noticed in several processes and stages.
First, a nep count is taken right at the bale – preferably from as many bales as possible – in at least every tenth bale and 4 corners. Before bales are put on opening line. High variations can be observed. Bales must be segregated and classified , then sorted before adding to the processing batch.
Nep count must be followed through to final stage with correcting measures applied to each process if necessary.
Depending on origin, staple, nep content, final count, spinning process, method, a more careful approach can so be achieved. The spinning process can be better controlled this way.
This method of segregation can safe the mill substantial costs in terms of : reducing ends down, less imperfections, better quality ( elongation, tenacity ) and evenness values, as well as less creation of non – and – recyclable fiber waste.
The benefits of applied careful measures can not be underestimated, and will run into tens of thousands of Dollars for each batch processed in this manner.
Today’s modern testing instruments such as AFIS can assist you greatly; an HVI is a must too. Still many mills do not invest in these instruments and prefer the older methods like Pressley, Micronaire.