Abstract:

In order to explore the wrapping effect characteristics of hollow spindle covered spinning which is different from other spinning technologies with hollow spindle mechanism, the process route and wrapping principle of covered spinning, parallel spinning, and hollow spindle fancy twisting technology were compared, the "forward wrapping" process was adopted for the direct wrapping of the core yarn by the outer wrapping yarn in covered spinning,and speed and tension analyses were carried out on the wrapping action. The results show that the wrapping angle of the outer wrapping yarn causes the wrapping point to move when the core yarn speed and the wrapping speed are unbalanced, and the joining guide wire imposes limits on the fluctuation of the wrapping point, resulting smaller range of wrapping twist variation. A suitable core yarn tension was found a necessary guarantee for achieving normal wrapping, and the deviation of the wrapping point from the center line caused by improper tension matching would cause change in wrapping structure. The wrapping tension causes the core yarn to rotate in the same direction as the wrapping direction, which has a counteracting effect on the wrapping twist.

Key words: hollow spindle covered spinning, wrapping effect, wrapping point, forward wrapping, spinning