What is the best type of filter plate cloth for my filter press and the process I'm running?
This depends on your process. Cloth selection is as much an art as it is a science. Based on our 1,000 years of combined experience
and lab testing, we can make an expert recommendation to you. We supply
cloths based on criteria you give us and based on sample processing we
do in our lab. Should your process change, we recommend that your cloth
type be evaluated for suitability.
The following is general
information to help you understand cloths and how they work. For
detailed questions, call our customer service department at
Cloths for non-gasketed plates are hung over the
plate, extending from top to bottom, and are held in place by eyelets
that fit over the cloth-pins on top of the plates. With the non-gasketed
plate, the filter cloth provides the seal between the plates. Leakage
will occur during operation even though Evoqua supplies the
non-gasketed plate cloths with latex edging. The latex will cut down the
wicking action somewhat, but will not eliminate it.
plate allows less leakage than the non-gasketed plate due to an O-ring
seal around the chamber and filtration ports. The gasketed cloth has a
high-density sash cord sewn around the cloth's perimeter that is caulked
into a groove on the plate.
The type of cloth used is determined
by the type of process or application performed by the filter press,
the operating environment, and the performance required by the filtering
media (filter cloths).
The filter cloths come in many different
materials including polypropylene, polyester, cotton, and other
synthetic materials. The cloths are made from monofilament fibers,
multifilament fibers, or spun fibers. The smooth surface characteristic
of monofilament fibers can help to improve cake release properties. The
uniform circumference of monofilaments also enables fabrics to be
produced with consistent pore sizes. Multifilament and spun fibers are
produced by twisting several smaller diameter monofilament fibers
together into a single strand. They are used to produce fabrics that
require a very tight weave and fabrics where high flow rates are not
Filter cloths also come in many different styles of fabric weave.
opening or pore size is also an important consideration when selecting
the proper filter cloths for a particular application. The mesh opening
or pore size is determined by the number of fibers, size of the fiber,
and the type of weave. These factors in turn govern flow rates, particle
retention, and the strength of the fabric itself. As shown below, these
two fabrics, having the same type of open area, will have similar flow
rates, but the fabric on the left will retain finer particles.
The cloths can also be finished in several ways:
- Heat set
filter cloth is the initial barrier that separates the solids from the
liquid; therefore, the filter cloth must remain porous to provide high
For more information on how filter cloths function in the filter press, click here: What is a Filter Press.
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