Effect of Crimp on Mechanical Properties of Wet Wool

O'Connell, R.A.; Yeiser, A.S.

doi:10.1177/004051755402400706

Cited by 12 publications

(6 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…1), and this agrees with an increase in stress at 30% extension observed with a decrease in crimp frequency in fibres of Rambouillet, Suffolk, and Navajo wools (O'Connell and Yeiser 1954). The relative positions of the curves for poorly crimped and well-crimped Merino fibres (Fig.…”

Section: Discussionsupporting

confidence: 83%

“…For fibres separated on the basis of crimp frequency per unit of fibre length from within staples of Suffolk, Rambouillet, and Navajo wools, Young's modulus and stress at 30% extension in water increase with decrease in crimp frequency (O'Connell and Yeiser 1954). An increase in the stress at 30% extension in water also accompanies an increase in percentage of para cortex (Thorsen 1958).…”

mentioning

confidence: 97%

See 1 more Smart Citation

Crimp in Wool: Cortical Segmentation and Tensile Properties of Well-Crimped and Abnormally Crimped Fibres of Merino Wool

Chapman¹

1965

Aust. Jnl. Of Bio. Sci.

View full text Add to dashboard Cite

SummaryPoorly crimped (or doggy) fibres, produced by follicles with hyperplasia of the outer root sheath tissue, have greater proportions of paracortex than adjacent wellcrimped fibres. Associated with this increase in paracortex is an increase in strength, as indicated by significant increases in the stresses in wet poorly crimped fibres at the turnover and breaking points on the stress-strain curve. Use of the stronger mechanical properties of doggy fibres as a means of distinguishing such fibres from the poorly crimped fibres in steely wool, produced by sheep on a copper-deficient diet, is proposed.The possibility that the state of follicle outer root sheaths can influence the distribution and proportions of the cortical segments in the wool fibres produced is discussed.

show abstract

Section: Discussionsupporting

confidence: 83%

mentioning

confidence: 97%

Crimp in Wool: Cortical Segmentation and Tensile Properties of Well-Crimped and Abnormally Crimped Fibres of Merino Wool

Chapman¹

1965

Aust. Jnl. Of Bio. Sci.

View full text Add to dashboard Cite

show abstract

“…The slope of the regression line, b, is 0.015, and by application of the t-test this regression is found to be significant ; t = 7.39. The exceptionally low stress values obtained with the Southdale and ~3elts,viJle top may be explained by the fact that the effect of crimp in reducing stressstrain properties is much greater with larger diameter tiller (16). (In particular this diameter effect has heen found to hold with the Suffolk wool used in this study [16}.)…”

Section: Mechanical Properties I N Jlue~nce Of Fiber Dianretermentioning

confidence: 83%

Estimation of Cortical Components in Various Wools

Thorsen

1958

Textile Research Journal

View full text Add to dashboard Cite

Wools varying widely in diameter and crimp. from sheep of several breeds and ages.were stained with various reagents chosen to give high contrast between ortho-and paracortical segments. The brown to black sulfide stain produced in wools by sodium plumbite, selective for the paracortex, was measured quantitatively and observed to increase with diameter. The greatest rate of change occurs in the fine diameter region. Wools shorn from sheep at different ages show lead sulfide staining increasing with age at shearing. Wool fibers which have been elongated or supercontracted show increased staining, which reflects the mechanical damage. The same wools were stained with acid nickelous nitrite, preferentially staining the ortho segment. It was verified that in this case the order of staining of the various wools is the reverse of that with plumbite. Solubility in an aqueous solution of urea and monothioglycol is shown to increase regularly with the degree of staining in the nickel solution. Bromine water also preferentially stains the orthocortex. Finally, paralleling the staining behavior, the stress in wool at 30% extension (wet) increases generally with diameter as well as with increasing maturity of the sheep..

show abstract

“…As a result of these investigations a close dependence of the tensile properties on both average CSA [2,3,7] and crimp [1,8] was established, whereas the effect of the contour ratio was found to be negligible [ 5 ] .…”

mentioning

confidence: 87%