Abstract: A filter cartridge formed of wound polypropylene yarn lacking a spin-finish and method of making same are disclosed herein. The method includes the steps of: providing a filter core; providing a plurality of continuous polypropylene filaments; applying water to the filaments without applying a spin finish to remove static therefrom; gathering together a plurality of the filaments to form at least two bundles; air texturing the at least two bundles of filaments to form a yarn; and winding said yarn around said filter core to provide a filter media.

Abstract: A two-layer weft knitted fabric of a three-thread fleece construction has an inner layer of polypropylene yarn, which is raised to form a fleece, and an outer layer of cotton yarn. The fabric is of a plain plaited structure consisting of a cotton face and binding yarn with a polypropylene backing yarn inlaid and tucked into the technical back of the fabric every fourth wale. In one embodiment, the inner layer of the fabric consists of a repeated sequence of three courses of polypropylene followed by a fourth course of cotton, and in a second embodiment all of the courses of the inner layer are of polypropylene.