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The invention relates to a filter cloth for a filter press and
to a method for producing said filter cloth. The inventive filter
cloth has a filtration section through which the filtrate reaches
a filter element of the filter press, and an edging section which
rests against the edge of the filter element. The filtration area
is provided with a cloth that differs from that of the edging section.
The filtration area is woven from monofil yarns while multifil yarns
are woven into the edging section.
A method is provided for fixedly joining a cloth, a cloth-like
fabric or a synthetic mesh to a filter plate using a flanged cloth
connector ring. The flanged cloth connector ring is attached to
the filter cloth around the feed port of the cloth and inserted
into a receiving channel in the filter plate. A locking ring or
a distribution ring may be inserted into the channel adjacent to
the connector ring to retain the connector ring and attached filter
cloth in place. Filter cloths may be individually and independently
attached to each side of a filter plate using a cloth connector
ring.
The invention relates to a filter cloth intended for a filter which
has a variable volume and is based on diaphragm extrusion, particularly
for a Larox.RTM.-type vertical pressure filter. The filtering properties
of the filter cloth (5) are substantially similar in both directions
through the cloth since slurry containing liquid and solids is alternately
placed on the different sides of the filter cloth. The filter cloth
of the invention comprises a middle layer (15) and protective layers
(16a, 16b; 17a, 17b) provided on both outer surfaces of the middle
layer. The middle layer can have e.g. a woven structure, and the
protective layers may be batt fiber layers attached to the middle
layer by needling. According to a preferred embodiment of the invention,
the protective layers according to the invention are denser than
the middle layer.
A filter cloth whose underside comprises substantially parallel,
additional yarns that are thicker than the rest of the yarns of
the cloth, substantially parallel channels being formed between
the yarns, wherein filtered liquid that passed through the cloth,
is allowed to flow in the direction of the surface of a filtering
element between the filtering portion of the cloth and the surface
of the element. The invention further relates to a filtering module
manufactured from the filter cloth of the invention.
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