Abstract: This paper introduces the current development status of quality detection technique on ring spinning. By analyzing the off-line detection techniques and related instruments according to the phases of raw cotton, semi-processed and yarn, and a development tendency for off-line detection towards instrumentation, automatization, high-speeding and differentiation is proposed. A discussion about the developing state of on-line quality detection is made by taking auto-leveling, foreign fiber detection and electronic clearing as examples, considering the features of full range, informationize and systematization for on-line detection will be embedded into the whole yarn-spinning procedures including ginning. The means of combining on-line and off-line detection and devising and utilizing various expert systems, will facilitate the monitor for the entire ring spinning process, raising the quality of ring yarn and stability to a new level.

Key words: ring spinning, quality control, off-line detection, on-line detection, developing trend