Bag filters can be made of woven or nonwoven materials. Nonwoven materials can further be
divided as felted or membrane. Most bags are either completely or partially made by weaving
since nonwoven fabrics are generally attached to a woven base called a scrim. Woven filters
are made of yarn with a definite repeated pattern. Felted filters are composed of randomly
placed fibers compressed into a mat and attached to loosely woven backing material. A membrane
filter is a special treatment where a thin, porous membrane (expanded polyfluorocarbon)
is bonded to the scrim, or support fabric. Woven filters are generally used with low
energy cleaning methods such as shaking and reverse-air. Felted fabrics are usually used with
higher energy cleaning systems such as pulse-jet cleaning. Membrane filters were developed
in efforts to achieve high efficiency particle capture and to handle flue gas conditions where
high moisture and resulting high pressure drop problems frequently occur.
divided as felted or membrane. Most bags are either completely or partially made by weaving
since nonwoven fabrics are generally attached to a woven base called a scrim. Woven filters
are made of yarn with a definite repeated pattern. Felted filters are composed of randomly
placed fibers compressed into a mat and attached to loosely woven backing material. A membrane
filter is a special treatment where a thin, porous membrane (expanded polyfluorocarbon)
is bonded to the scrim, or support fabric. Woven filters are generally used with low
energy cleaning methods such as shaking and reverse-air. Felted fabrics are usually used with
higher energy cleaning systems such as pulse-jet cleaning. Membrane filters were developed
in efforts to achieve high efficiency particle capture and to handle flue gas conditions where
high moisture and resulting high pressure drop problems frequently occur.
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