"Filter fabric" is a generic term used to describe geotextiles whose primary function is allowing water to pass while keeping soil fines from migrating through the fabric. US Fabrics offers a complete line of geotextile filter fabrics.
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There are three types of geotextile filter fabrics: needle punched nonwoven, DuPont&#; spunbond nonwoven, and woven monofilament. The most commonly used are needle punched nonwovens. These popular fabrics are used in applications such as wrapping a perforated pipe or the gravel in a French drain. There are also nonwovens robust enough for heavy duty filtration applications such as placement under rip-rap for shoreline erosion control.
In cases where fine grain sands (beach sands) are present, a woven monofilament is required. Monofilaments prevent the clogging that can occur when fine particles migrate into the matrix of a needle punched nonwoven and get stuck. Unlike nonwovens, woven monofilaments have a unique property called percent open area that prevents clogging. Monofilaments also offer higher strengths than nonwovens.
Sometimes &#;filter fabric&#; is used incorrectly to describe woven separation and stabilization geotextiles. While these products do allow water to pass, they can clog and do not have the flow rates and permittivity of true filter fabrics.
Industrial filter fabric is a filtering medium woven from natural or synthetic fibers, including metal mesh or filter screen.
Polypropylene fiber series material properties: acid and alkali resistance, good wear resistance, good conductivity, slightly better recovery than polyester, poor corrosion resistance.
Heat resistance: slight shrinkage at 90&#;;
Elongation at break (%): 18-35;
Tensile strength (g/d): 4.5-9;
Softening point (&#;): 140-160;
Melting point (&#;): 165-173;
Relative density: 0.91.
Filter fabric classification: polypropylene short fiber filter fabric, polypropylene filament filter fabric, polypropylene monofilament filter fabric.
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Filtering performance: Polypropylene short fibers have short fibers and the spun yarns are hairy; polypropylene long fibers have long fibers and smooth spun yarns, so industrial fabrics woven from polypropylene short fibers have hairy surfaces and are better for powder and pressure filtration than long fibers.
Polypropylene long fiber woven industrial fabric has a smooth surface and good air permeability. It is mainly used for solid-liquid separation equipment such as plate and frame filter presses, vacuum suction filters, belt filters, page filters, and centrifugal filters in many industries such as chemical industry, fertilizer, building materials, sugar making, nonferrous metal smelting, and sewage treatment.
When the air thermal conductivity coefficient is 1, the thermal conductivity coefficients of various fibers are as follows: Polypropylene filter fabric-Vinylon-silk-polyester-wool-acrylonitrile-nylon-viscose cotton. In addition, when cutting, the edges should be left wider and coded to avoid yarn slip and "pilling" phenomenon.
Filter fabric can be divided into polyester, polypropylene, nylon, Vinylon, cotton, new high-efficiency materials and other filter fabrics according to their material properties.
According to the weaving method, it can be divided into two types.
Woven fabric: including polyester, polypropylene, nylon, Vinylon, cotton, etc. There are several weaving methods for fabric patterns, including plain weave, twill weave, satin weave, double-layer weave, etc.
Non-woven fabric: including polypropylene melt blown non woven fabric, geotextile, filter felt, etc. The methods include spunbonding, needle punching, and hydroentanglement.
The silk material of filter fabric is also divided into three types: monofilament, long fiber compound silk, and short fiber. (Among them, the short fiber series of polyester also includes large fibers and small fibers).
Filter fabric can be divided into several types of primary, medium, and high efficiency non-woven fabrics, mainly made of polyester and polypropylene materials. They are made of polyester and polypropylene raw materials, and are made into fabrics by needle punching, combing, and weaving the sandwich layer in the center of the cloth. After double-combing and air-flow forming a net, they are compounded into cloth by needling, and then heat-set, burnt, and chemically treated on the surface with oil agent to make the surface of the filter fabric smooth, with uniform micro-pores, and good density from the surface, with smooth surfaces on both sides and good air permeability.