CORRELATION BETWEEN QUALITY OF SIZING YARNS AND CLINGING TENDENCY OF WARP YARNS

摘要

With the sharp increase in loom speeds and the smaller shed opening angles, clinging of warp ends tends to occur in weaving-especially on air jet looms. The clinging of warp yarns leads to an unclean shed. The effects are reflected in reduced efficiency and reduced quality, which cut into operational economy. The tendency to produce clinging points is determined by means of the separating force which is necessary to open the clinging points which have developed in the region of the rear shed between the threads of the upper and of the lower shed during the specified number of shed changes. The lower the separating force, the fewer and less intensive are the clinging points which have formed during weaving, in other words, the better the weaving behavior of the warp ends. The clinging tendency is decreased along with the increase of sizing add-on and the abrasion resistance; increased along with the increase of hairiness and warp density. Size and yarn types also have effects on clinging tendency. For a given sizing yarn and weaving machine parameters, we try to correlate between clinging tendency and sizing quality. A good correlation between clinging tendency and sizing quality indicates that clinging tendency could be evaluate by sizing quality, such as, abrasion resistance, hairiness, and sizing add-on etc.