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The effect of a fabric softener treatment on the properties of the crossing torque–intersecting angle behavior of yarns and the transverse compression properties of single and crossing yarns, which are related to the shear properties of a fabric, is investigated. The crossing torque required to change the intersecting angle between two yarns, the hysteresis in the crossing torque–intersecting angle curve (i.e., crossing torque hysteresis), and the compression properties of cotton yarns after water treatment with and without softener were measured. To measure those properties, the drying condition was varied after the treatment to comprise crossed yarns with an applied load and parallel yarns in a bundled state. The average crossing torque value of the sample with a softener treatment was less than that with a water treatment for yarns from a bundle. For yarns dried while crossed, the average crossing torque value of the sample with a softener treatment was somewhat less than that with a water treatment. For both drying conditions, the average crossing torque hysteresis value decreased after a softener treatment. The compressional resilience value of the sample with a softener treatment was greater (bouncier) than that with a water treatment for yarns dried while crossed. The results suggest that the softener treatment reduces the crossing torque and increases the compressional resilience of yarns. This is due to the reduction of hydrogen bonding between surface fibers via the softener. The softener treatment also decreased the crossing torque hysteresis, corresponding to decreased friction between fibers.

Effect of fabric softener on crossing torque and compression properties of cotton yarn