Orientation-Disorientation Effects in Tensioned,Mercerized Cotton. The Pretreatment of Yarns for Wash-Wear Fabrics of High Strength and Durability

Abstract

Slack mercerization of cotton, with restretching to various degrees in the mercerizing alkali, was compared to merceriza tion at constant, preselected lengths as a method of yarn pretreatment. Fabrics were woven of these pretreated 2-ply yams and were crosslinked with DMEU to a wrinkle recovery of 270°-286° (W + F). In certain cases little or no loss of strength occurred during DP finishing, and the yarn-mercerized fabrics possessed greater strength after crosslinking than ordinary fabric not crosslinked at all. Moreover, after 20 launderings several of the experimental wash-wear fabrics equalled in strength the unmercerized, uncrosslinked, unlaundered fabrics prepared as controls. X-ray orientation, yarn strength, and elongation, as well as the degree of stretching during yarn pretreatment, were correlated with yarn and fabric strength after crosslinking and after fabric laundering. In yarn slack-mercerized and restretched to 91% of normal length, both the strength and the elongation after crosslinking equalled the values for unmercerized yarn before cross linking. The same effect occurred in fabrics woven from these yarns. Evidence is presented that domains of swelled and shrunken cellulose remain in mercerized cotton fibers even after tension has been applied to orient the crystallites and straighten the fibrillar spirals of the alkali-wet cotton. The most effective yarn pretreatment, for increased strength retention after DMEU crosslinking, was slack mercerization followed by restretching to 103% of normal length. In fabrics woven of these yarns, covalent crosslinking by DMEU actually increased the durability, as measured by strength retained during multiple launderings. Yarn commercially mercerized to 102% of normal length also was highly suitable. The increased yarn length obtained in this kind of pretreatment could largely offset the cost of yarn mercerization, leaving the cost of yarn plying as the principal item of expense.

Get full access to this article

View all access options for this article.

References

Creely, J.J. , Segal, L. , and Ziifle, H.M. , Determination of the Degree of Crystallite Orientation in Cotton Fibers by Means of the Recording X-Ray Diffraction Spectrometer, Textile Res. J. 26, 789-795 (1956).

de Boer, J.J. , The Spiral Angle and Orientation of Swollen and Stretched Single Cotton Fibers and Their Relation to Fiber Tenacity, Textile Res. J. 43, 141-145 (1973).

Duckett, K.E. and Tripp, V.W. , X-Ray and Optical Orientation Measurements on Single Cotton Fibers, Textile Res. J. 37, 517-524 (1967).

Flory, P.J. , "Principles of Polymer Chemistry," Ithaca, Cornell University Press, 1953, pp. 475-480.

Goldthwait, C.F. , Murphy, A.L. , Lochmann, I.W. , and Smith, H.O. , Mercerization of Yarn-Experimental Apparatus and Techniques, Textile Res. J. 22, 540-548 (1952).

Hebert, J.J. , Giardina, R. , Mitcham, D. , and Rollins, M.L. , The Effect of Convolutions on Orientation Measurements in Cotton Fibers, Textile Res. J. 40, 126-129 (1970).

Kyame, G.J. , Lofton, J.T. !, and Brown, J.J. , Can the Seersucker Suit Make a Comeback?, Textile World 117 No. 9, 109-112 (1967).

Luther, W.F. , Mercerized Cotton Thread, U. S. Patent 2,686,955, August 24, 1954.

Murphy, A.L. , Margavio, M.F. , Welch, C.M. , Ward, T.L. , and Mazzeno, L.W. , Jr., Durable Luster and Improved Strength for Cotton Yarn and Fabric , U. S. Agricultural Research Service Publication 72-37 (1965).

10.

Murphy, A.L. , Margavio, M.F. , Cooper, A.S. , Jr., and Welch , C.M. , Yarn Mercerization Techniques in Preparing High-Strength Wash-Wear Cottons, Textile Res. J. 38, 544-553 (1968).

11.

Murphy, A.L. , Margavio, M.F. , and Welch, C.M. , All-Cotton Durahle-Press Fahrics of High Strength from Slack-Mercerized, Partially Restretched Yarn. Evidence for the Separate Origins of Strength and Wrinkle-Resistance Effects in Conventional Cross-Linking Treatments for Cotton Textile Res. J. 41, 22-31 (1971).

12.

Murphy, A.L. , Margavio, M.F. , and Welch, C.M. , DP Cotton Knits Made from Mercerized Yarn Retain Strength, Shape, Abrasion Resistance, Textile Chem. Colorist 4, 129-132 (1972).

13.

Orr, R.S. , Burgis, A.W. , DeLuca, L.B. , and Grant, J.N. , The Role of Spiral Structure in Untreated and Treated Cottons, Textile Res. J. 31, 302-310 (1961).

14.

Orr, R.S. , Burgis, A.W. , and Grant, J.N. , Effects of Tension during Resin Treatment on Physical Properties of Cotton Fihers and Yarns, Textile Res. J. 31, 550-577 (1961).

15.

Treiher, E. , "Die Chemie der Pflanzenzellwand," Berlin, Springer-Verlag, 1957, p. 378.