Abstract: A method of infusing liquid dyestuff into synthetic yarns at the point of fiber production, comprising the steps of providing a molten polymer, at least one non-molten liquid dye, and a spin pack assembly adapted for receiving and mixing the molten polymer and the non-molten liquid dye therein to form a colored molten polymer composition. The spin pack assembly includes a screen for filtering the molten polymer therethrough, and a spinneret adapted for receiving and extruding the molten polymer composition therethrough to form a plurality of colored fibers adapted for being formed into the synthetic yarns.

Abstract: A composite, break-resistant sewing thread having a core of continuous multi-filament, non-stretch high-tenacity synthetic yarn and a cover of drafted staple fibers air-jet twisted around and covering the core for protecting the core from heat and friction during a sewing operation. The yarn is plied.

Abstract: An improved yarn package carrier for supporting packages of yarn in a pressure kier. The improved yarn package carrier comprises a circular base for being positioned within the kier adjacent its bottom and having an upper surface. The spindles are mounted on the upper surface of the yarn carrier base and have progressively greater pre-determined lengths so as to extend upwardly in tiers to a point above the top opening of the kier and into the area defined by and enclosed within the dome-shaped cover into close proximity thereto from its edge to its apex. As a result, the capacity of the kier is greatly increased by enabling as many yarn packages to be carried by the spindles as can be mounted on each spindle intermediate the upper surface of the carrier base and the inner wall of the dome-shaped cover.