the excess polyester yarn causes loops l to form fig2 b represents the results obtained after combining polyester and polyamide yarn using the method of this invention on unwinding the combined yarns from a pirn the yarns p and n are combined together into what appears a single integrated yarn substantially free from loops after the process of this invention was developed additional experiments were carried out to determine if the combining of yarns could be carried out in the opposite manner that is by drawing the polyamide yarn while introducing fully drawn polyester yarn thereto it was found that the yarn combined under these conditions was as 34 loopy 34 if not more so than yarn obtained by drawing both ends together or by combining previously drawn yarns it was concluded that the success of the method of this invention depends on inherent differences in the shrinkage of polyester and polyamide yarn when subjected to the methods of drawing described and that the forces developed in the action of drawing the polyester yarn can be made to counteract almost exactly the tendency of the polyamide yarn to shrink compared to polyester yarn in the combining process by use of this invention any two yarns which.