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Weaving is the interlacing of two or more yarns, using a loom. Generally, woven synthetic fabrics are strong fabrics. To weave yarns together, the loom is first set up with yarns running lengthwise, from the top to the bottom of the loom. These are called warp yarns. A second yarn is then threaded from side to side, over and underneath warp yarns, to make woven synthetic fabrics. This is called the weft yarn. When the shuttle completes passing through the space provided, from one side to the other, the position of the warp yarn is again changed and the weft is brought back through in the return direction. This process is continually repeated until the woven synthetic fabric is produced. The weft yarn turning and returning to make the next row creates a strong edge on the fabric, called the selvedge. It is the strongest part of the woven synthetic fabrics; it will not fray like a cut edge. A variety of weave types may be used to create woven synthetic fabrics with different textures and appearances. These weave include plain, twill, basket or hopsack, satin and sateen. The resulting fabrics differ depending on the number of warp yarns the weft yarn goes over at a time, and in what combinations.

Textile filter belt screen are an essential part of countless industry processes, contributing to product purity, savings in energy/production costs and a cleaner environment. This paper describes, in general terms, the factors which are taken into account when designing a filter belt screen for a solid-liquid separation process, touching on textile raw materials and, with particular reference to filtration and filtration equipment considerations, the elements of cloth constructions and finishing procedures. In the last 20 years the European Community has introduced more than 100 legal regulations in the area of environmental protection, the majority of which are directed towards the control of environmental pollution. It is, therefore, not surprising that industry should look to filtration technologies to assist in meeting the increasingly stringent statutory requirements, but, in addition, industry is also looking to the same technologies for both technical and economic reasons. The technical reasons include aspects such as improved product quality whereas economic aspects may be in respect of shorter process cycle or reduced manning levels or perhaps drier filter cakes and therefore the need for less thermal energy in subsequent processing. This paper reviews some of the factors which are taken into account when selecting or designing a filter belt screen for a particular application. The types of raw material available are described, Together with some basic polyester mesh constructions and finishing processes. Suggested procedures for fabric evaluation are also briefly examined.

The polyester forming fabric on paper machine shows great effect on the forming of the fibre mat into a uniform and consistent web of fibres. The polyester forming fabric designed to support the fibrous suspension and assist with the drainage of the stock suspension as a finely woven fabric . They are classified into 2 or 3 layers by surface structure and by open area. Normally they  have a finer mesh on the top of the structure with a coarse supportive mesh on the non-paper side. During the forming process polyester forming fabric allows the water to pass through the voids between the filament weaves of the wire while the fibre forms a mat on top of the Forming Fabric. The  polyester forming fabric is a continuous belt which allows the water to be drained evenly through the fabric while forming a fibrous mat, as well as it transfers the web over the forming area (Forming Table) as part of the continuous paper making process. It design will influence the sheet formation. The polyester forming fabric open area, the number of layers used in the fabric structure and the size of the filaments used will determine the drainage rate and the size of the fibrous and filler particles which are maintained within the sheet (Web) structure (Retention). It is necessary to clean polyester  forming fabrics for maintain their drainage properties. Traditionally Forming Fabrics were made from Bronze wire, interwoven to the correct mesh dependant on the grade to be produced, now the Forming Fabrics are made from a combination of Polyester and other synthetic materials interwoven into single double and triple layered fabrics.