CONTROL OF DRAFTING BY AIR FALSE TWISTER (II)

Abstract

In the preceding paper (I), the ability of air twister tube as a substitute for usual twister tube of woollen ring spinning frame was studied.The effects of draft ratio, air pressure and tube dimension on false turns were experimented.The same testing apparatus as in the preceding paper was used in this experiment. The relation between irregularity of sliver and drafting condition-tube position, ratch, thread angle, etc-was investigated. The experimental results suggest the capability of the high drafting of condensed slubbing.The results obtained are as follows.1. The irregularity of slubbing drafted by using air twister tube has the same order as usual false twister. (Figs. 3, 4) These results substantiate the possibility of air twister.2. The tube setting should be decided by fiber length of the condensed slubbing. Each curve of Figs. 5 and 6 has a minimum value at the point of the longest fiber. Getting the ratch short, the irregularity is slightly reformed, and so, the long ratch as the woollen mule spinning is not necessarily reasonable. (Fig. 7)3. Applying air false twister, drafting with 2_??_3 zone is able to draft higher the woollen slubbing than usual single zone. In this case, the draft ratio of each zone should be limited within the range of CVa/CVb<1.