Abstract: In this paper, the effect of the gauge of gill pin carding plate on cotton yarn hairiness was investigated. The cotton yarns produced by respectively installing gill pin carding plate, saw-tooth carding plant and taker-in grid under the taker-in to the card were tested with YG172 yarn hairiness tester. The results show that: (1) when installing gill pin carding plate, the gauge of 1.5 mm is most beneficial to the reduction of cotton yarn hairiness; (2) when installing saw-tooth carding plate, the gauge of 1.5 mm is also most beneficial to the reduction of cotton yarn hairiness, followed by the gauge of 0.9 mm, while the gauge of 0.6 mm is most unfavorable to the reduction of cotton yarn hairiness; (3) in all the programs for reducing cotton yarn hairiness, gill pin carding plate with the gauge of 1.5 mm is the best choice, saw-tooth carding plate with the gauge of 0.6 mm is the worst; (4) compared to installing taker-in grid under the taker-in,installing gill pin carding plate and saw-tooth carding plate are more conducive to the reduction of cotton yarn hairiness in general (except for the case when carding plate gauge is 0.6 mm). When a smaller gauge is used, gill pin carding plate is inferior to saw-tooth carding plate in term of reducing cotton yarn hairiness; but when a larger gauge is used, the former outperforms the latter and this regularity is very obvious.

Key words: card; gill pin carding plate; saw-tooth carding plate; taker-in grid; gauge; hairiness