With all harvesting methods, however, the cotton seed, together with the fibers, always gets into the ginning plant where it is broken up into trash and seed-coat fragments. This means that ginned cotton is mostly contaminated with trash and dust particles and that an intensive cleaning is only possible in the spinning mill.
Nep content increases drastically with mechanical harvesting, ginning and subsequent cleaning process. The reduction of the trash content which is necessary for improving cotton grade and apperance unfortunately results in a higher nep content level.
The basic purpose of Blow room is to supply small fibre tufts + clean fibre tufts + homogeneously blended tufts if more than one variety of fibre is used to carding machine without increasing fibre rupture, fibre neps , broken seed particles and without removing more good fibres.
The above is achieved by the following processes in the blowroom