フィラメント運動の高速度ビデオ画像を用いたインターレース糸生成過程の解析

抄録

In order to make a generation mechanism of interlaced yarn clear, an air jet was blown at a second to polyurethane yarn 400tex/3f, which was fixed to chucks at both ends, in an enlarged interlacer, and motion of each filament was photographed with a high speed video camera. Then we discussed twists, which create entanglements, by using an example of braids and a generation mechanism of entanglement from an example of filament motion photographed. The generation mechanisms of twist and entanglement obtained are as follows: (1) Filaments open at the cross-section of yarn duct positioning at the center axis of air jet nozzle: an opening part of interlaced yarn is generated. A twist is formed when a filament winds around another filament with this opening of filaments. Twists of different type, which are formed one after another, generate tangling parts at both sides of the opening part. (2) A high speed air jet collides with the yarn duct wall opposite to the air jet nozzle and flows along the wall in the direction of the exit of air jet nozzle to form a twin vortex. It would be a typical pattern of twist generation that a filament with this twin vortex winds around another filament, which stays at a relatively low speed near the wall opposite to the exit of air jet nozzle.