Determining Residual Torsional Energy Limits in Plied versus Alternate Feed Single Jersey Knits
Plied yarns neutralize torsional spirality within the strand cross-section, while alternate feeds distribute opposed stresses across alternating courses.
AATCC 179
Evaluation Procedure
Standard test methods from the American Association of Textile Chemists and Colorists determine the dimensional stability of fabrics by tracking changes in skewness after home laundering. For this purpose, aatcc 179 provides the specific guidelines to mark and measure knit or warp-and-weft fabrics before and after washing cycles. The procedure ensures that the rotation of courses or fills is documented accurately under controlled lab conditions.
Structural Shift
Fabric rotation occurs when the internal stresses of yarn twist release during wetting and agitation. Measuring this movement via aatcc 179 reveals how much a garment might twist during consumer use. Severe spirality causes side seams to torque toward the front or back of the apparel, which ruins the garment drape.
Mechanical Force
Aggressive washing actions accelerate yarn relaxation and exacerbate structural deformation. Interlaced constructions resist this distortion better than single jersey knits because of their locked yarn system. Tension during knitting or finishing stored as potential energy releases immediately upon contact with water.
Quality Metric
Mill standards specify maximum allowable skewness values to protect garment appearance. Handlers apply aatcc 179 to verify that finished goods remain within commercial tolerance limits. The calculated percentage of skew governs decisions to accept or reject bulk production lots.