Effect of let-off ratio in looms with double beams on warp contraction of check fabrics

Check fabrics are always woven on looms with double beams because of the weave difference.For the different weaves,the warp contraction and the appearance are both directly affected by the let-off ratio of the upper beam to the bottom one.This article mainly discussed the relationship between the letoff ratio of the loom with double beams and warp contraction of check fabrics woven with pure cotton.Trial weaving showed that when compared with the weaves with low interweave frequency,the weaves with higher interweave frequency have larger warp contraction and fit for basic stitch.Whatever for gray or finished fabric,there is an excellent liner relationship between let-off ratio and fabrics warp contraction margin of basic and fancy.Through regression analysis,the linear equation for the relationship can be obtained and the correlation factor is high enough.It provides a basis for quick respond in setting let-off ratio in practice.