33—DEPOSITS IN THE ROTOR GROOVE IN OPEN-END SPINNING PART IV: THE EFFECTS OF GROOVE SHAPE, YARN LINEAR DENSITY, DIRECTION OF TAKE-OFF, ROTOR DIRECTION, AND TWIST IN YARN

Yarn take-off from the back of the rotor is shown to reduce rotor deposits substantially. The shape of the rotor groove is shown to affect the amount of material deposited in a given time (1 hr), as also is the yarn linear density. These phenomena are explained in terms of the concept of an effective collecting area for deposits on the slide wall. A modified rotor groove gave better yarn properties as well as fewer deposits. Yarn take-off from the back also gave fewer deposits, but the improvement in yarn properties was less, possibly owing to the influence of some design feature tending to increase irregularity.