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Woven cloth, filter media

Normally the filter strueture consists of a stack of plates attached to a hollow shaft which are mounted inside a pressure vessel with eaeh plate eovered with a suitable filter medium. The slurry is fed under pressure into the vessel and the eake, which is retained by the filter medium, forms on the top of eaeh plate whilst the filtrate passes through the hollow shaft further to the proeess. Filter sizes may vary but generally the maximum is 60 m area and designed for a 6 bar operating pressure. Each circular plate in the staek is eonstructed with radial ribs that are welded to the bottom and support a horizontal eoarse mesh screen whieh is eovered with a fmer woven metal screen or filter cloth to retain the cake. The bottom of the plate slopes towards the hollow eentral shaft whieh lets the filtrate flow freely through circumferential holes and further down the shaft to the filtrate outlet. The elearanee between the plates is maintained by speeial spacers... [Pg.193]

Cotton filter cloths Woven cotton cloth stretched on a frame to produce a filter medium. [Pg.1425]

The most commonly used filter medium is woven cloth, but a great variety of other media is also used. The main types are listed in Table 10.2. A comprehensive discussion of the factors to be considered when selecting filter media is given by Purchas (1971) and Mais (1971) see also Purchas and Sutherland (2001). Filter aids are often used to increase the rate of filtration of difficult slurries. They are either applied as a precoat... [Pg.410]

The filters used for gas cleaning separate the solid particles by a combination of impingement and filtration the pore sizes in the filter media used are too large simply to filter out the particles. The separating action relies on the precoating of the filter medium by the first particles separated which are separated by impingement on the filter medium fibres. Woven or felted cloths of cotton and various synthetic fibres are commonly used as the filter media. Glass-fibre mats and paper filter elements are also used. [Pg.458]

The main types of filtering centrifuges are suspended batch machines, which are discontinuous in their operation automatic short-cycle batch machines and continuous conveyor centrifuges. In suspended centrufuges the filter media are canvas or other fabric or woven metal cloth. In automatic machines fine metal screens are used in conveyor centrifuges the filter medium is usually the slotted wall of the basket itself. [Pg.1011]

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. [Pg.132]

Pdndpal types of filteriiig centrifoges are suspended batch machines, automatic short-cycle batch machines and continuous cmiveyor centrifuges. In suspended centrifoges, the filter medium is usually canvas or a similar fabric, or woven metal cloth. Automatic machines employ fine metal screens. The filter medium in conveyor centrifoges is usually (he slotted wall of the bowl itself. [Pg.122]

Textiles, as a woven cloth or a nonwoven fabric, are probably the most common industrial filter medium, and are made from natural (cotton, silk, wool) and synthetic fibres. Wire cloths and meshes are also widely used in industrial filtrafions, produced by weaving monofilaments of ferrous or non-ferrous metals the simpler plain weave is used for sieving and sizing operations, and the more complex weaves such as Dutch twills are used on pressure and vacuum filters. At the small scale, particularly for laboratory use, filter papers are common, made from fibrous cellulosic materials, glass fibre or synthetic polymers these papers are made using developments from conventional paper manufacturing processes. [Pg.80]

Woven media can be called woven wire, woven fabric, wire mesh, wire cloth etc. Precision woven wire cloth is a versatile, wear-resistant filter medium which has been widely used for many years and is available in a large variety of weaves made from many metals. The most frequently used metal is stainless steel, in either type 304 or type 316. The basic difference between the two types is the addition of molybdenum to the type 316 for increased corrosion resistance. Both are otherwise 18-8 alloys, i.e. 18% chromium and 8% nickel. Acmally type 304 is 18-20% chromium and type 316 is 16-18% chromium. [Pg.289]

Some types of filter media, such as paper, felt and woven cloth, have a variable pore size, and so do not have an absolute rating. The effective cut-off is largely determined by the random arrangement of pores and the thickness of the medium. The performance may then be described in terms of a nominal cut-off or nominal rating. [Pg.22]

Fabrics of Woven Fibers For cake filtratiou these fabrics are the most common type of medium. A wide variety of materials are available some popular examples are listed in Table 18-10, with ratings for chemical and temperature resistance. In addition to the mate-ri of the fibers, a number of construction characteristics describe the filter cloth (1) weave, (2) style number, (3) weight, (4) count, (5) ply, and (6) yarn number. Of the many types of weaves available, only four are extensively used as filter media plain (square) weave, twill, chain weave, and satin. [Pg.1706]

The filter floor and cloth, woven mesh screen or sintered metal plate medium... [Pg.201]

Flexible media may be woven or unwoven. Filter media, woven from cotton, wool, synthetic and regenerated fibers, and glass and metal fibers, are used as septa in cake filtration. Cotton is the most widely used natural fiber, nylon is predominant among synthetic fibers. Terylene is a useful medium for acid filtration. Penetration and cake discharge are influenced by twisting and plying of fibers and by the adoption of various weaves such as duck and twill. The choice of a particular cloth often depends on the chemical nature of the slurry. [Pg.3887]


See other pages where Woven cloth, filter media is mentioned: [Pg.1600]    [Pg.1694]    [Pg.1712]    [Pg.367]    [Pg.73]    [Pg.201]    [Pg.46]    [Pg.633]    [Pg.367]    [Pg.1422]    [Pg.1914]    [Pg.2037]    [Pg.563]    [Pg.85]    [Pg.102]    [Pg.210]    [Pg.1904]    [Pg.2025]    [Pg.1604]    [Pg.1698]    [Pg.1716]    [Pg.134]    [Pg.73]    [Pg.9]    [Pg.114]    [Pg.67]    [Pg.380]    [Pg.346]    [Pg.145]   
See also in sourсe #XX -- [ Pg.112 ]




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