Fabric construction, filter media

Filter-medium selection embraces many types of construction fabrics of woven fibers, felts, and nonwoven fibers, porous or sintered solids, polymer membranes, or particulate solids in the form of a permeable bed. Media of all types are available in a wide choice of materials. 

Use Thermal, acoustic, and electrical insulation (coarse fibers in bats or sheets) decorative and utility fabrics such as drapes, curtains, table linen, carpet backing, tenting, etc. tire cord as belt between tread and carcass filter medium reinforced plastics light transmission for communication signals reinforcement of cement products for construction use. 

The choice of filter medium and fabric construction is important to baghouse performance. The fabric filters are constructed from both natural and synthetic materials, and the selection is usually made on the basis of the following factors [2] ... 

Erosion control fabrics n. Fabrics used in the stabilization of embankments and the containment of silt run-off from erodible slopes. In embankment stabilization, the fabric functions as a filter medium behind stabilizing rip-rap revetments. In siltation control, the fabric acts as a filter to contain silt while allowing excess water to drain freely. In turf reinforcement, the mat is used to retain soil while allowing roots and stems to grow through. In fabric-forming systems for the construction of revetments, a double-layer, water-permeable fabric is positioned, then pumped full of structural grout. These systems are alternatives to rip-rap. 

To avoid chemical or thermal damage to the yams, the choice of material for construction of the filter medium for any particular filtration application is important. Historically, filter fabrics were produced by weaving yarns spun... 

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. 

---