Abstract: There is disclosed a method of and apparatus for use in the production of shaped, high polymeric articles, particularly yarns, in which natural, thermo-plastic high polymeric material and a coloring agent are mixed together and the delivery of the coloring agent for mixing is controlled in dependence upon the rate at which the mixture is processed.

Abstract: A liquid finish composition is applied to a plurality of continuous thermoplastic polymer filaments in such a way that the composition is applied to all the filaments uniformly from filament to filament. More particularly, the filaments are arranged side-by-side in a substantially planar array, at a first location one face of the array is contacted with the liquid finish composition and, then, at a second location spaced apart from the first location the other face of the array is contacted with the same composition. During the contacting at the first and second locations the tension is controlled so that it is in a range in which the contacting applies the composition to the filaments uniformly from filament to filament.

Abstract: A stuffer box crimped yarn of lengthwise uniformity in appearance is produced by twisting together or, more specifically, cabling at least three multifiliment ends, at least one of the ends being of a different color, initial twist or initial texture from at least one other of the ends, or by twisting together, that is, wrapping, two stuffer box crimped multifilament ends, at least one of the ends having an initial twist, the ends being of different colors, initial twists or initial textures.

Abstract: A multi-colored, cabled, stuffer box crimped yarn containing filaments of respectively at least two non-contrasting colors and a contrasting color, the filaments of the at least two non-contrasting colors imparting a heather appearance to the yarn and the filaments of the contrasting color imparting color accents to the yarn, is produced by cabling together at least three stuffer box crimped multifilament ends, each of the three ends containing filaments of at least two non-contrasting colors and one of the three ends containing filaments of the contrasting color in a discrete grouping and in a proportion greater than the proportion in the same end of filaments of any individual non-contrasting color and, prior to being twisted together with the other ends, containing a twist in the same sense as the twist to be imparted in the step of twisting together all the ends and, after being twisted together with the other ends, preferably containing a twist of a higher degree than the twist contained in the other end

Abstract: In melt spinning, in order to permit high rates of spinning without deterioration in yarn quality, the area in which the filaments enter the quench bath is partially surrounded by baffle means and at at least two symmetrical locations about the periphery of that area wetting agent is introduced into the area.