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The most importantconsiderations in choosing a fiber for filtration is the type of filtration andthe environment in which filtration or dust collection will take place. Thefollowing should be taken into account:
Type ofFiltration: (a) Air or (b) Liquid
Air Filtration– the most common objectives arepurification (either incoming or outgoing) and recovery of a product. In someapplications the two can be combined for beneficial results. Many installationsmade for purposes of air pollution control have resulted in the recovery of ausable product. For example, a smelting plant will recover valuable dust; apower plant collects fly ash, which is usable as an aggregate in concrete, etc.
Liquid Filtration– the three main objectives are refining aproduct, recovering a product and clarifying the filtrate. Filter clothqualities forliquid filtrationwould include the ability to preventpassage of a solid material, allow an even flow of liquid, resist plugging, andease of filter cake removal.
Our cloth isexpertly and accuratelycut and punched to your specificationsat our facility. Alatex bordercan be added to some fabrics for greatersealing performance during your process.
Our experiencedtechnicians can recommend the right cloth for your process.
1.Polypropylene Filter Cloth
This woven fiberis widely chosen for its lightness, high strength and excellent resistance tomost acids and alkalis. The sleekness of the fiber allows for excellent cakerelease. Since its moisture absorption is virtually nil, polypropylene is agood choice for an application such as dye production, where pigment changescan be made with only a light wash between batches. A latex border can beapplied to the individual cloths to provide greater gasketing and sealingproperties during the operation.
2.Polypropylene Felt Filter Cloth
Non-woven andcalendered, polypropylene felt has all the attributes of polypropylene,including lightness, high strength and excellent resistance to most acids andalkalis, with the added benefit of improved cake release due to the calenderedsurface and greater gasketing or sealing properties due to the increase in thethickness of the cloth. To further improve its sealing qualities, a latexborder can be applied to the individual cloths.
Polyester filterand dust collection fabrics have very good resistance to chemicals, abrasionand dry heat degradation, plus excellent dimensional stability. Typicalapplications include dust collection, particularly in the cement industry; acidrefining of ore; anode bags for electroplating; tubular battery separationfabrics.
HEAT RESISTANCE:275 - 300°F
4.Polyester Felt Filter Cloth
Polyester fibersare compressed and finishes are applied according to the process or applicationthey are used for. All of the excellent characteristics of polyester apply topolyester felt, including good resistance to chemicals, abrasion and dry heatdegradation, plus excellent dimensional stability. Polyester felt is mostcommonly used in dust collection processes, where the air flow is eitherforward or reverse pulse. The direction of the air flow dictates the finishrequired.
5.Nylon Filter Cloth
Because of itshigh abrasion resistance, nylon is used in filtration of abrasive dusts or wetabrasive solids at low temperatures. Nylon’s good elasticity makes it ideal forconditions where continuous flexing takes place. This fabric is a good choicein wet filtration applications, at low temperatures and in an alkalineatmosphere, for example in dyestuffs. Fabrics of nylon provide excellent cakerelease.
HEAT RESISTANCE:At up to 260°F, nylon has reasonably good dryheat resistance. It is superior to acetate, modacrylic and saran, but mostother synthetics are superior to it. Nylon performs adequately in moist heattemperatures ranging up to 225°F; however its high initial tensile strength andabrasion resistance will make it a preferred choice in a number of applications.
6.Conductive (Anti-Static) & Non-Conductive FilterCloth
Conductive(Anti-Static) cloth is a synthetic material, most often a polyester, woventhroughout with stainless steel wire or carbonized filament to dissipate staticelectricity. Non-conductive material is also usually polyester, but does notcontain these metal wires or filaments and is therefore, ineffective in thedissipation of static electricity. Conductive (Anti-Static) is more commonlyused in industrial applications. The addition of the wires and filaments has noaffect on micron or porosity readings of the cloth. It is simply added todissipate static electricity during the use of the material. Conductive(Anti-Static) cloth is most commonly used in the manufacture of replacementbags, socks, chutes and sleeves for fluid bed dryer equipment, high sheargranulators, mixers, blenders, milling operations, hoppers and dischargechutes.
Non-ConductiveStyles – The following specifications include only Conductive (Anti-Static)styles. Non-Conductive styles do not contain carbon or steel and are lesscommonly used. For specifications and further information about theNon-Conductive styles available please contact us.
HEAT RESISTANCE:Nylon 260 ºF / Polyester 275 to 300 ºF
7.Nomex Filter Cloth
Nomex® nylon wasdeveloped and registered by the E.I. DuPont Company for applications requiringgood dimensional stability and excellent heat resistance. Nomex® nylon can beused at temperatures at which other fibers melt, and unlike glass, it isresistant to fluorides and has good abrasion and flex resistance. It has a widerange of filtration applications, including the cement industry, carbon black,non-ferrous metals and steel.
Heat Resistance:Nomex® nylon does not melt, but at temperatures above 700°F degradationsets in rapidly. In dry heat, up to and including450°F, this fiber may be used satisfactorily, as long as there is no acid dewpoint problem. Small amounts of water vapor at elevated temperature have littleor no effect on Nomex® nylon. At elevated temperatures and intimate contactwith water or saturated steam, Nomex® nylon exhibits a progressive loss instrength. However, it withstands these conditions much better than many otherfibers.