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Filter Fabric and Needle Felt ....
Weave
patterns and treatment of filter fabric A fabric, also called textile, is a flexible material comprised of a network of natural or synthetic fibers often referred to as thread or yarn. Weaving textiles we offer are used for filter presses, filter bags and belt filters. Plain
Is one
of the most simple weave patterns. The warp and filling threads cross
alternately. Plain-woven fabrics are generally the least pliable, but the most stable.
Characteristics: high particle retention and low resistance to
blinding with average cake release properties. Twill Is a weave characterized by a diagonal rib or twill line. Each warp floats over at least two or more consecutive fill yarns, enabling a greater number of yarns per unit area than a plain weave, while not losing a great deal of fabric stability. Characteristics: average resistance to blinding, average cake release, good mechanical strength. Satin The face of the fabric consists almost completely of warp produced in the repeat of the weave. This is the most flexible of weave patterns and conforms very easily around most contoured surfaces. Satin weaves are usually four, five, eight, or twelve harness. Characteristics: excellent cake release, average retention, excellent resistance to blinding. Calendering Filter cloth is stabilized in preheating machinery. Final surface finishing and permeability is achieved with high speed calenders - heated and polished steel rolls - which press the fabric making the surface smooth and compact and further "set" the cloth. Heat-set Filter fabric is heat-set by heating the woven material in hot water up to 100°C. The effect of heat-set is a fast aging of the fabric to achieve the natural shrinkage of the filter fabric in a short time. After heat-set the filter fabric will not shrink anymore and the dimension of filter cloth is stable even when higher application temperature is applied to the fabric. Edge
Sealing Synthetic sealing of the cloth is applied by liquid injection of the filter media which creates depth coating of the fabric at the joints of the filter press plate. This acts to prevent wicking action of the filtrate but is also very important when washing or air blowing the cake. The treatment prevents by-passing of the wash liquor or air blow. Woven
and Felted Belts Woven
and felted belts use clipper or alligator seams. In some cases filter belts are
stitched onto the machine. Pressure filter belts are available for vertical
filter presses and open monofilament constructions for belt filter presses. Specialty
felted belts are used on corrugator machines. Polypropylene Fabric
Most of
the filter fabric is made from multi- or/and monofilament Polypropylene yarn.
The surface of the filter fabric is usually calendered to achieve good behaviors
of separation and an excellent filter cake discharge. All
filter fabrics are treated by heat-set to shrinkage the dimension before using. This treatment
guaranties the correct size of the filter fabric for the total life time even
when high application temperature happens during operation. The
chemical and mechanical behavior of Polypropylene are extraordinary. · low specific weight · high flexibility and excellent pressure resistance · high impact strength and superb tensile strength · good non-ageing and fair temperature resistance (also due to sterilization) · first-class abrasion resistance and very low friction because of the smooth surface · superior chemical resistance against acid and caustic Polyamide
& RILSAN Fabric
RILSAN
is a type of Polyamide. Our RILSAN filter fabrics are made from monofilament
yarn. Other Polyamide filter fabric is also available as
multifilament yarn. The chemical and mechanical behavior of the calendered and
heat-set fabric is extraordinary: · low specific weight · high flexibility, excellent pressure resistance, high impact strength · good non-ageing and fair temperature resistance · first-class abrasion resistance and because of the smooth surface and the lowest possible friction factor · superior chemical resistance Some Fabric Specifications
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