The Quantitative Determination of Stiffness in Individual Yarns
1936
Saxl, Irving J.
IN view of the importance of the exact knowledge of stiffness in individual yarns and yarn combinations, a method has been developed for measuring these characteristics quantitatively. It consists essentially in determining the force necessary to bend a piece of yarn, held at one end, through various angles. For convenience in the application of the force, the yarn is formed into a U-bend, the load being applied at the center of the U. The bending angle is variable by means of a turning device. The instrument is used in conjunction with am analytical balance. The method described lends itself to a great many different applications. Among others, the load-versus-deflection characteristics for various types of yarn have been determined. The influence of the number of filaments and proper sizing upon the stiffness is shown, as is the hysteresis effect. The method lends itself to the determination of the modulus of clasticity.
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