Polypropylene contamination in fine combed cotton causes undyed white specks and high winding cuts, inflating effective landed yarn costs by up to 21 percent.
Core sampling raw cotton requires deep core extraction, standard atmosphere conditioning, and calibrated instrument verification to secure commercial payment accuracy.
Commercial mass calculations prevent paying for atmospheric moisture by basing billing on clean dry mass plus official fiber regain allowances.
Extended InGaAs sensors expand optical contaminant contrast up to 2.2 micrometers, trading lower quantum efficiency and higher dark current for absolute polypropylene detection.
Reconciling moisture regain discrepancies requires calculating net dry mass via gravimetric oven drying and applying standard commercial allowances to correct invoice weights.
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