HIGH SPEED MEASUREMENTS OF STRENGTH AND ELONGATION
Mar 13, 2017

Breeding & Genetic improvement WCRC Breeding-NorthAmerica WCRC1
Abstract                                                                         Back to Table of contents

High volume instruments used to class cotton for market are rapid and objective.  Accurate measurements combined with premiums and discounts for specific quality factors provides a good vehicle for cotton improvement. Many textile mills now use instrument results to select bales which match a desired product quality.  Since 1990, the USDA has been providing instrument results to all producers requesting cotton classification.  Herein we describe the fundamental mechanics of high speed testing and compare recent results from two new instrument designs with laboratory measurements.  Correlations with yarn quality from ring and rotor spinning systems are included.

Conclusion

Modern high speed instruments now measure cotton fibre strength with a high degree of precision and accuracy.  Their results compare well with the best available laboratory method to estimate manufactured yarn strength.  These new instruments do not require any special operator skills while laboratory measurements (Stelometer) demand highly skilled technicians for precision and accuracy.

Strength differences between instruments for some cotton varieties has been well documented in the literature.  These differences are traced to a combination of a mass sensing errors (not properly adjusted by micronaire) and a difference in the amount of residual crimp after brushing.  Development programs are underway to reduce or eliminate instrument strength differences.

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