Filaments, woven filter media

The properties of a fabric, especially as regards its behaviour as a filter medium, depend very much on the way in which the yams are woven together. Many properties, however, are intrinsic in the nature of the basic fibre or filament, and of the way in which it is made up into a yam. There are three basic types of yam in wide use for filter media monofilament, which is a single continuous filament of synthetic material (or silk) multifilament, which comprises a bundle of identical continuous filaments that may or may not be twisted together and staple, which... 

The basic material of a woven fabric (filament or fibre) and the way that this material is formed into a yam are major parameters in the choice of a fabric as a filter medium. The variety of available woven fabrics is virtually unlimited even if only the materials from which the filaments or yams are made, and the complexity of the yam, are considered. To these must then be added the stracture of the woven fabric itself the way in which the yams are woven together, and the finishing process (if any) applied to the fabric after weaving. 

Flow through the clean medium will be determined by the geometric characteristics imposed on the medium by the weaver, in fitrming various patterns (plain, twill, sateen, etc.) fi om basic yams. In woven cloth, the latter are either sohd monofilaments, or are multifilamanets (which can be further subdivided into continuous or staple-fibre constmetions, depending on the type of filament used). In some cases, the sur ce of the medium may be modified to improve its ability to release the filter cake, etc. Nonwovens are paper-like, random arrays of fibres which can be obtained in many forms uniform fibres, mixed and conposhe pads, etc. These media, like wovens, can be supplied sur ce modified. 

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