EFFECTS OF DYNEL FIBER BLENDING ON YARN SHRINKAGE AND WOVEN-FABRIC PROPERTIES
LOWELL TECHNOLOGICAL INST RESEARCH FOUNDATION MA
Pagination or Media Count:
Regular and high shrink Dynel were blended in varying proportions and patterns and spun into 16s yarns with two twists. Microscopic examination showed semblances of expected groupings, but the high shrink fibers tended to migrate to the outside. Shrinkages of the yarns in water 200F were measured under varying tensions. Minor loading reduced shrinkages to low levels, suggesting that mechanics of shrinkage in free yarn are different than those in fabric. There was little correlation of the yarn shrinkage results with the different combinations. Maximum shrinkage occurred in the 5050, low-twist, draw-frame yarn with alternate feed. The least shrinkage in blended yarns was in low-twist yarns with greater proportions of high-shrink fiber. A 5050 picker blend warp was woven with fillings from the various blends and twists. The fabrics were scoured and treated for water repellency. Highest shrinkage in scouring occurred with low-twist fillings while final shrinkage showed the reverse. High-twist filling yarns produced less air permeability. Differences in shrinkage and air permeability among various blend arrangements were not significant. There was little correlation among the results of yarn and fabric shrinkage and air permeability. All water repellency tests were poor fabrics with low-twist fillings were better than those of high twist. Overall, among blended yarns, the 5050 pair arrangements with one drawing seemed more favorable and distinctly better than the 5050 picker blend.