ベールオープナの開繊機構 （第２報）実際的なベールを用いたモデル実験による解析

Abstract

In the previous paper, the opening mechanisms of bale opener was investigated by using mass balance analyses, tooth edge locus analysis and two bale model experiments. Some primary factors about how to open fine and uniform tufts were derived. The condition that plucking ratio (Rp) value is high and constant seems to be very important to make good quality yarn finally. Therefore in this paper, the relationships between Rp value, and 1) bale surface condition and opening condition, 2) length and direction of the fiber which composes bale are discussed through experimental study by using real bales.The results can be summarized as follows : 1. Tuft weight Wp and Rp increases proportionally as the bale feed speed increases.2. In the case that the bale feed speed is constant, both Wp and Rp increases once and then decreases as the parallel press bars force onto bale surface increases. In these relationships, the condition to realize the low Wp with the high Rp can not be found.3. As for the effects of the fiber length of bale, tuft weight becomes smaller at shorter fiber length and Rp value are higher at both longer and shorter end sides of fiber length. As for the effects of fiber direction of bale, Wp becomes smaller and Rp value is higher when tufts is obliquely plucked.