Production method for chemical fiber and polyester composite yarns

The invention relates to a production method for chemical fiber and polyester composite yarns, in particular to a method for producing chemical fiber and polyester composite yarns of partially oriented yarns (POY) and fully drawn yarns (FDY) by one kind of equipment through a one-step method. The POY and the FDY are subjected to composite spinning on the same winding frame, and the spinning process can simultaneously meet process flows required by producing the two kinds of yarns; the FDY and the POY enter a draft area from the same side of a first pair of drawing rollers, wherein the FDY pass through the first pair of drawing rollers consisting of a large-diameter heat roller and a large-diameter heat roller, and, together with the POY, pass through a yarn guide roller below the first pair of drawing rollers, and the FDY and the POY are combined and compounded into a bundle of yarns on the yarn guide roller; and the composite yarn bundle passes through a second pair of drawing rollers consisting of a large-diameter heat roller and a non-heating small-diameter separator roller to form the composite yarns. The effects of saving a production space and saving energy are obvious, the processed fiber composite yarns are reliable in quality, stable in process and high in cohesiveness and the dying property is superior to that of the conventional product.