Abstract
Cotton fiber length parameters are used across the cotton industry to select elite germplasm, purchase cotton bales and manage mill throughput. The High Volume Instrument (HVI) provides the most commonly used fiber length parameters, upper half mean length (UHML) and uniformity index (UI). UI is the ratio of mean length (ML) to the UHML expressed as a percentage. These length parameters, UHML and ML, are generated following the fibrograph principle and are highly correlated with two span lengths on the fibrogram curve. These two length parameters represent a small part of the fibrogram and do not characterize the total within-sample variation. In previous studies, we found that fiber length variation captured by the whole fibrogram improves the prediction of yarn quality. However, HVIs are currently calibrated for UHML and UI. In this study, we investigated a correction method using a set of 461 commercial samples to correct the whole fibrogram curve across HVIs and validated the method using an independent set of 932 commercial samples. The correction procedure lowers the Euclidian distance between fibrograms as much as 35%, bringing the fibrogram measurements into agreement across multiple HVIs. This indicates that the whole fibrogram could be used to improve HVI fiber length measurements across the cotton industry.
Highlights
Every cotton bale produced in the United States is tested for several fiber quality parameters such as micronaire, upper half mean length (UHML), uniformity index (UI), fiber strength, color, and trash in order to determine their best use
We demonstrated that the current High Volume Instrument (HVI) fiber length parameters are not independent and share demonstrated that the current HVI fiber length parameters are not independent and share
The UHML for this sample set ranges from 23.9 mm to 31.5 mm, and the UI ranges from 77.1% to 85.2% (Table 1)
Summary
Every cotton bale produced in the United States is tested for several fiber quality parameters such as micronaire, upper half mean length (UHML), uniformity index (UI), fiber strength, color, and trash in order to determine their best use. These measurements are used throughout the cotton industry for different purposes, such as identifying bales for purchase, determining the proper settings on spinning equipment, and evaluating germplasm in research [1,2,3,4]. Screening a breeding nursery based on these parameters allows a breeder to develop germplasm with the potential for improved spinning performance [8,9]. Textile mills use fiber length and other fiber quality parameters to select cotton bales that enable them to spin their targeted yarn quality [10]
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