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CONSTRUCTION
Felt Bags
Felt construction is generally chosen where smaller
particle retention is required, in the 1 to 100 micron range. It
offers higher solids loading capacity than mesh. General-purpose
felt bags are offered in polyester and polypropylene materials.
Special purpose felt bags include high temperature service (to 500
Fahrenheit) bags of Nomex nylon or Teflon. For removal of oil,
bags made of special felted polypropylene microfibers, known as
Oil-Absorb, are available. A size 2 Oil-Absorb bag will remove
approximately a half-pound of oil from a water-oil liquid. It is only
available with a 25 micron rating.
If finer filtration is needed in an oil removal task, No Dust Model 8
filters can be fitted with two bags in series. The inner one an
Oil-Absorb bag and the outer a finer standard bag. Installed this
way, true two stage filtration is achieved, (two stage filtering can be
done for longer intervals between servicing).
Mesh Bags
Mesh is a woven construction, generally used where micron ratings of 5
to 800 (660 to 20 mesh) are required.
Two types are offered. The multifilament mesh is a low cost,
disposable material, offered in polyester or nylon. Monofilament
mesh has higher strength, and is available in polypropylene or nylon.
(It should be considered cleanable.)
FELT BAG FINISHES & COVERS
Standard finish. Plain, as manufactured,
without treatment or covers.
Glazed finish. The outermost surface fibers are melted by the momentary
application of high heat. This bonds them to one another and
effectively reduces the possibility of their breaking off. (Not
available on high-temperature bags.)
Mesh covers. Covers are available that completely encase the bag.
Made of woven polyester mesh, nylon mesh, spun-bonded nylon (Cerex), or
spun-bonded polyester (Remay), they act to contain any fibers that may
separate from the filter bag.
DESIGN DETAILS
All No Dust filter bags have a metal retaining ring
at their openings. Standard ring material is cadmium-plated carbon
steel, with 316 stainless steel optional.
Heavy-duty handles, sewn to the reinforced bag lip, are a standard
feature. They make bag bag removal faster and easier.
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