Cotton Tenacity Measurements with High Speed Instruments

Taylor, Robert A.

doi:10.1177/004051758605600204

Cited by 22 publications

(12 citation statements)

References 14 publications

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“…Because the fineness of fibers in the air orifice affects the pressure drop (measured across the orifice), it was necessary to adjust the desired pressure drop amount (AMT) for cotton fineness. A micronaire (M) correction [7] was applied to the calibration amount established during HVI strength calibration (AMTC):…”

Section: Methodsmentioning

confidence: 99%

“…Taylor [7] measured the extension speed of a research model (MCI) at 19.8 cm/min, and Brown [2] reported the speed of an MCI 3000 system at 13.6 cm/ min. Others have studied the effect of testing time on cotton strength for Stelometer and Pressley methods [4,5], but the literature does not reveal sufficient information to indicate the importance of controlling jaw displacement for the speed range used by the HVI systems.…”

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Development of a Computerized Method to Measure Cotton Tenacity at Different Extension Rates

Godbey

Taylor

Brown

1991

Textile Research Journal

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Published research has indicated that cotton strength increases as the specimen loading rate increases when measured by Stelometer and Pressley methods. This report describes an instrument designed to test 1/8 gauge bundles at constant rates of extension from 0.05 to 50 cm/min. A computer analyzes voltage signals from force and displacement transducers. Pressley jaws hold the fiber bundles, and a Stelometer vice is used to load them in the jaws. Specimens are selected with a mechanized sampling and combing procedure. The method provides measurements of strength, elongation, modulus, and two forms of toughness.A new class of fiber testing instruments is evolving to meet the demand for increased information and better precision while measuring the quality of cotton enroute to market. The quality evaluation procedure involves removing or cutting two small samples from each cotton bale, which are delivered to a USDA marketing service office for testing in a controlled laboratory. At the laboratory, they are opened and exposed to circulating air for a time sufficient to assure proper temperature and moisture content. In ofhces where the new high volume instruments (HVI) are being used, fiber length, length uniformity, strength, fineness, lint color, and trash content are measured.There are two manufacturers of HVI systems, Motion Control, Inc. (MCI) of Dallas, Texas, and Spinlab/ Uster Inc., of Knoxville, Tennessee. Both measure cotton fiber length with tapered bundles (a collection of fibers each grasped at a random position along its length with its ends free to extend parallel to each other from a clamp). Prepared specimens (5.1 to 6.4 cm wide) are measured at several distances from the clamp to form fibrograms for length analyses. A point (some distance from the clamp) is selected for strength testing.HVI strength measurements are made at a jaw displacement speed much faster than conventional laboratory instruments, but laboratory instruments are used to check strength values obtained with the HVI methods. The Cotton Division of the Agricultural Marketing Service (AMS) has reported higher HVI strength values for some cottons when compared to Stelometer values [8]. Brown [2] demonstrated the speed problem by modifying an HVI to operate at two extension speeds. He reported no average strength difference when the HVI was recalibrated at each speed, but there was a 9% loss in the strength of his calibration cottons when tested at the increased extension speed.Hertel and Phillips [3,5], on the other hand, reported strength gains with an increasing rate of loading for Stelometer and Pressley methods.The precise extension speed of HVIs is loosely controlled, and jaw displacement is not routinely calibrated. Taylor [7] measured the extension speed of a research model (MCI) at 19.8 cm/min, and Brown [2] reported the speed of an MCI 3000 system at 13.6 cm/ min. Others have studied the effect of testing time on cotton strength for Stelometer and Pressley methods [4, 5], but the literature does not reveal sufficient informat...

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Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

Development of a Computerized Method to Measure Cotton Tenacity at Different Extension Rates

Godbey

Taylor

Brown

1991

Textile Research Journal

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“…Sample conditioning history and the sampling methods affect the strength measurements; the fibre strength increases nearly 10 % for a 1% increase in moisture (Lawson & al., 1976). The mechanisms and procedures to prepare cotton for tenacity testing, the tapering of fibres near their ends, the residual crimp after brushing were studied by Taylor (Taylor, 1986). The light crossing the fibres and the amount of light reaching the detector seem to affect the beard mass.…”

Section: High Volume Instruments (Hvi)mentioning

confidence: 99%

Macro and Micro Characterization of Biopolymers: Case of Cotton Fibre

Harzallah¹,

Dréan²

2011

Biotechnology of Biopolymers

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“…61 Fibre specimens prepared by automatic samplers were more representative of cotton lint than specimens prepared for strength tests by conventional methods. 62 Further, the gauge length at which fibres are broken introduces an inverse length bias on the test, particularly if a sample has a high SFC. Use of laboratory bench bundle testers is diminishing and most tensile values reported today are generated using HVI lines.…”

Section: Tensile Measurementmentioning

confidence: 99%

Cotton fibre quality

Gordon

2007

Cotton

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Cotton Tenacity Measurements with High Speed Instruments

Cited by 22 publications

References 14 publications

Development of a Computerized Method to Measure Cotton Tenacity at Different Extension Rates

Development of a Computerized Method to Measure Cotton Tenacity at Different Extension Rates

Macro and Micro Characterization of Biopolymers: Case of Cotton Fibre

Cotton fibre quality

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