Definition and Measurement of Crimp of Textile Fibers

Alexander, E.; Lewin, Menachem; Muhsam, H. V.; Shiloh, M.

doi:10.1177/004051755602600804

Cited by 32 publications

(15 citation statements)

References 10 publications

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“…Crimp ratio and effective crimp diameter are typical usefull measures to represent the degree of the crimp of textile fibers and its tri-dimensional distribution, as pointed out by Alexander et al [12). We introduce them as local quantities which are defined for each free fiber segment: let the local crimp ratio C, be defined by Cr= (lF-l)/lF, (39) and, following Alexander et al (12), the local effective crimp diameter Deff by (40) where h is the distance between each point of the free fiber segment and the skeleton (the straight line connecting the end points of the segment); integration being done along the fiber.…”

Section: Crimp Parametersmentioning

confidence: 99%

“…We introduce them as local quantities which are defined for each free fiber segment: let the local crimp ratio C, be defined by Cr= (lF-l)/lF, (39) and, following Alexander et al (12), the local effective crimp diameter Deff by (40) where h is the distance between each point of the free fiber segment and the skeleton (the straight line connecting the end points of the segment); integration being done along the fiber. These crimp parameters, hence, depend in general on the orientation of each free skeleton.…”

Section: Crimp Parametersmentioning

confidence: 99%

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An extension of the theory of the deformation of fiber assemblies.

Itoh

Komori

1991

Sen-i Gakkaishi

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A new approach is presented to the micromechanics or fiber assemblies, extending the current idea of the local fiber orientation distribution.The theory can predict all the differential elastic moduli of a mass in terms of its structural parameters, the density of fiber length, orientation density, fiber crimp parameters, and elastic modulus of the fiber, if the strain-force response of the elemental deformation unit of the fiber is explicitly given. The general scheme combined with the helical spring model is applied to the uniaxial compression of an isotropic mass and some effects of the fiber crimp on the compressional properties of the mass are examined and compared with experimental results.

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Section: Crimp Parametersmentioning

confidence: 99%

Section: Crimp Parametersmentioning

confidence: 99%

An extension of the theory of the deformation of fiber assemblies.

Itoh

Komori

1991

Sen-i Gakkaishi

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“…A suggestion to describe the irregular shape of a textile fiber by &dquo;effective&dquo; values referring to regularl y shaped models was made by Atexander et :;1. [1 ]. An &dquo;effective&dquo; crimp diameter D was denned as an analogue to the average amplitude of a wave.…”

Section: The Static Parametersmentioning

confidence: 99%

“…The &dquo;effective&dquo; wave number was given by An &dquo;effective&dquo; curvature was defiaed us follows These parameters have previously been used for the measurement of crimp of wool fibers [1,2,7], as well as of artificially crimped jute E4]. They are used in the present work in order to differentiate hetween various cottons by their crimp properties.…”

Section: The Static Parametersmentioning

confidence: 99%

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The Crimp of Cotton Fibers

Alexander

Lewin

Litav

et al. 1962

Textile Research Journal

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An investigation of the crimp properties of cotton fibers is presented. Two independent groups of parameters are used: one describing the geometry of the fiber and the other the dynamic behavior of its crimp.The static parameters—the crimp diameter and the crimp ratio—are measured on a crimp meter. The dependence of these parameters on the applied load is determined, and some functional relationships are suggested.The dynamic parameters used are the uncrimping energy and the uncrimping force. Both are determined from the load-elongation curves, recorded on the Instron tester. The coefficients of immediate and retarded recovery of crimp of fibers subjected to tensile deformation are determined.Two varieties of cotton are tested: Deltapine 15 and Acala 1517. A significant diffference between the mean static parameters of these varieties is found. The more crimped appearance of the Deltapine fibers is confirmed by the higher values of these parameters. Furthermore, the force necessary to draw out these fibers from the lot is found to be higher than for the Acala fibers. The values of the uncrimping energies of the Deltapine fibers are also found to be significantly higher than those of the Acala.The values of the recovery coefficients show that about 50% of the uncrimping energy of the Deltapine fibers is recovered immediately after stretching. The corresponding recovery of the Acala fibers is about 25%. After 24 hr of relaxation, the fibers of both varieties show a recovery of 55%. The uncrimping force and its recovery coefficient are found td be less sensitive parameters for characterizing these cotton varieties.

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Textiles, Testing

Banks‐Lee

Pegram

2000

Kirk-Othmer Encyclopedia of Chemical Technology

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Objective and subjective methods for testing of fibers, yarns, and conventional fabrics are presented in this article. A brief discussion of testing methods for geotextiles and geomembranes is also given. Methods reviewed are mainly from ASTM and American Association of Textile Chemists and Colorists (AATCC) standards. Specific properties discussed are, for fibers, length, crimp, transverse dimensions, density, cross‐sectional shape, shrinkage, friction, optical, tensile and elastic properties, moisture absorption, and electrostatic and thermal properties; for yarn, size and number, twist, strength, evenness, friction and texture; and for conventional fabrics, construction, thickness, air permeability, strength and elongation, snag, pilling and abrasion resistance, shrinkage, thermal and moisture transmission, color and wash fastness, flammability, hand, drape, wrinkle resistance, luster, and comfort. Test methods for geotextiles and geomembranes include those for filtration and clogging, permeability, permittivity and pore size, tensile properties, degradation by ultraviolet light and temperature, abrasion, friction, and construction parameters, including mass and thickness. Where appropriate brief discussions of fiber, yarn, and fabric properties are included as they relate to the testing procedures. Testing equipment available for making particular measurements has also been given in many instances.

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Definition and Measurement of Crimp of Textile Fibers

Cited by 32 publications

References 10 publications

An extension of the theory of the deformation of fiber assemblies.

An extension of the theory of the deformation of fiber assemblies.

The Crimp of Cotton Fibers

Textiles, Testing

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