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Fiber length distribution variability in cotton bale classification: Interactions among length, maturity and fineness

Proper classification and bale selection are prerequisites to success in a modern cotton spinning operation. Currently, for crops where automatic High Volume Instrument (HVI) classification is the norm, fiber selection is done based on HVI data which does not include adequate characterization of fiber length distribution. This research evaluates the effectiveness of current cotton fiber classification and selection procedures in controlling for variability in fiber length distribution and presents a new approach to adequately clustering cotton bales into homogenous groups based on empirical length distributions. The results show that using the common HVI parameters to group the bales produces categories with uncontrolled length distribution variability. Differences in distribution patterns appeared related to the potential for bales with the same micronaire levels to differ significantly in maturity and thus in propensity to break.