Note : Les descriptions sont présentées dans la langue officielle dans laquelle elles ont été soumises.
Docke~ NO. 0265-CI-~P
This invention relates to a f iltering apparatus, and more
particularly, to filters of the type used for filtering a
slurry such as pulp stock for the manu~acture of paper.
One type of currently used filters includes a f ilter sup-
port wlth a f iltering bag mounted on the support. The
flltering bag is made of a suitabla material, such as
polypropylene. The polypropylene bag i5 p~aced over the
filter support and opposed longidutional edges of the bag
are zipped up by means of a zipper. The zipper parts are
also made of a suitable material such as polypropylene.
Unfortunately, when the temperature of the slurry is
above, say 165Q, the zipper parts begin to break and
became disengaged from the polypropylene filtering bag.
When this happens, solids pass through the filtering bag
and metal support, which, of course, is undesirable.
This invention pro~ides a filter having a filtering bag
which is securely mounted on the filter support. The
zipper, such as used on the currently used filtering
bags, is eliminated. Rope means extend alony the opposed
edges of a longitudinal opening in the ~iltering bag.
The rope means are embedded in the opposed edges of the
flltering bag. The opposed edges are held in sealing
Z5 contac~ by sealing means such as a longitudinal tube.
Briefly described, the invention is a filter for removing
liquid from a slurry. A mesh fil~ering bag is mounted on
a metal support. The metal support has openings adjacent
to the mesh filtering bag for the flow of filtra~e into
the metal support. At least one drainage duct for drain-
ing the filtrate from the support is provided in the
metal support. The mesh filtering bag has opposed edges
longitudinally extending along one side of the mesh fil-
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tering bag from the bottom of the bag to the top of
the bag. Rope means is embedded in the opposed
edges. Means are provided for holding the opposed
edges in sealing engagement.
Briefly described, the new mesh filtering bag is a
flexible, preshaped mesh filtering bag adapted to be
installed over a rigid filtering bag support. The
flexible, preshaped mesh filtering bag has two edges
with embedded rope means. The two edges are located
so that when the bag is installed, it will have one
side with laterally opposed edges longitudinally
extending from the bag bottom to the bag top. The
edges are adapted to be brought into sealing
engagement when installed over the filtering bag
support.
According to a still further broad aspect of the
present invention, there is provided a flexible,
preshaped mesh filtering bag adapted to be installed
over a tapering from top to bottom rigid filtering
bag support having openings for the flow of filtrate
into the support, and means, at one end of the
support for draining filtrate from the support. The
flexible, preshaped mesh filtering bag comprises one
integral form fitting mesh bag having two edges with
embedded rope means located so that when installed on
the rigid filtering bag support, the bag will have
one side with laterally opposed edges longitudinally
extending from the bottom of the bag to the top of
the bag. The edges are adapted to be brought into
sealing contact when installed to form a closure.
The closure provides means to allow installation over
the tapering rigid bag support and a means for
retention of the filtering bag on the tapering rigid
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support. Means is provided for holding the opposed
edges in sealing engagement, wherein the mesh
filtering bag is made of fiber material. The rope
means is made of fiber material and further consists
of a single rope extending from the bag bottom, along
one opposed edge, over the bag top, and along the
other opposed edge to the bag bottom.
The invention, as well as its many advantages, will
be further understood by reference to the following
detailed description and drawings in which:
Fig. 1 is an elevational side view of a filter
segment constructed in accordance with one embodiment
of the invention, shown with a portion of the bag
broken away;
Fig. 2 is an elevational side view of the embodiment
of Fig. l;
Fig. 3 is an enlarged fragmentary sectional view of
the structure for enclosing the filtering bag into
seal-tight engagement on the support;
Fig. 4 is an enlarged view taken along lines 4-4 of
Fig. l;
Fig. 5 is an enlarged fragmentary view of one end of
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Docket NO. 0265-CI~PP
the sealing tube of Fig. l;
Fig. 6 is a view taken along lines 6--6 of Fig. 5
and in the direction of the arrows; and
Fig. 7 is an end YieW of the sealing tubo of Fig. 5.
In the various figures, like parts are referred to by
like numbers.
Referring to the drawings, and more particularly to Fig.
1, a filter segment for a disk-type filter is shown to
illustrate the invention. The filter segment 10 is
mounted on the usual rotatable hub }2 in iuxtaposed rela-
tionship with other filter segments, ad~acent ones being
indicated by fragmentary and broken lines. The segment
is connected at its outer periphery to the ad~acQnt
~e~ments by tubular clip8 14 which internally receive th~
seqments and the sagments ar~ attached to the clip~ by
suitable fasteners (not shown). Each tubular clip 14
extends over adjacent top portions of juxtaposed filter
segments 10. A ~ubular clip 16 innerconnects the tubular
clips 14 to completely enclose the outer periphery of
each filter segment 10.
The segment 10 comprises a base 18 which includes a cen-
tral box-like section having walls 20 enclosing a down-
wardly-tapering passage or duct 21 connected to one of
the flow channels 24 in the hub 12 ~or draining filtrate
from the segment 10.
The segment 10 also has a pair of axially-spaced side
walls 26, 28 ~see Fig. 4~, each connected at one end to
the base 18 and extënding longitudinally from the base 18
in opposed-spaced relationship. The side walls overlap
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Docket No. 0265-CI-PP
along the radially-extending sides of the filter segment.
The side walls 26, 28 serve to ~upport the filtering bag
and each wall has a plurality of radially extending, cir-
cum~erentially separated lands 41 separating 10UVQrS 44
(see Fig. 1). The space 30 (sae Fig. 4) betwaen the side
walls 26, 28 throughout the lengths and breadths of tha
side walls 26, 28 serYes as a drainage duct and communi-
cates with the pa~sage 21 in th~ base 18 for draining
filtrate from the filter segment.
A flexible, preshaped mesh filtaring bag 32 is installed
over the side walls 26 and 28 of the filtering bag sup-
port section 10. The preshaped mesh filtering bag 32 is
one integral mesh piece. When fabricated, the filtering
bag has rope means embedded therein in a manner such that
when the bag i~ installed on the bag support there will
be laterally opposed edges 34 and 36 (see Fig. 4) longi-
tudinally extending from the bag open bottom to the bag
closed top. The rope portions 38 and 40 are encased in
loops 42 and 43 on opposed edges 34 and 36 respecti~ely.
The preshaped, flexible m~sh filtering bag open bottom
abuts against a sewn hem which extends completely around
the bottom of the flexible, preshaped mesh filtering bag
32. An annular rope insert 46 is e~oedded within the hem
48. A clamp 49 encloses the bottom of the flexible, pre-
shaped filtering bag 32 into seal-tight engagement about
the rigid filtering bag support segment 10.
The mesh filtering bag 32 may be made of polypropylen~
and the annular rope 46 may also be made of polypropy-
lene.
After the flexible, preshaped mesh filtering bag has been
inserted over the metal support sector 10, the opposed
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Docket No. 0265-CI-PP
edgas 34 and 36 (see Fig. 4) are brought into sealing
contact by the longitudinally extending tube 50. Tha
opposed edges 34 and 36 longitudinally extend along the
open side of the mesh filtering bag 3~ from the bottom o~
S the bag to the top of the bag. If de~ired, two separate
ropes may be embedded in each opposed edge 34 and 36.
However, preferably, the rope means consists of a single
rope which extends from the filtering bag bottom, along
one opposed edge 34, over the filtering bag top and along
the other opposed edge 36 to the filtering bag bottom.
As shown in Fig. 4, the portions 38 and 40 of the single
rope extend longitudinally along the opposed edges 34 and
36 and are laterally separated along the same plane. The
rope may be made of polypropylene or any other suitable,
lS flexible material.
The tube 50 which holds the opposed edges 34 and 36 in
sealinq engagement is fitted over the loops 42 and 43 and
extends along the full length of the opposed edges 34 and
36. The tube 50 has a longitudinal slot 62 (see Flg. 6
and Fig. 7) in which the opposed edges, the loops, and
the rope portions extend. The longitudinal slot 62 is
formed by the curved surfaces 63 and 65 formed by out-
wardly extending lips 64 and 66, respectively, on each
side of the longitudinal slot 62. Ea~h open end of the
tube 50 is flared ou~wardly (one flare shown in Fig. 7).
The bag 32 is installed over the filter bag support. The
matal tube 50 is slid over the loose longi- tudinal edges
of the bag into which the rope has been sewn to effec-
tively seal the side of the bag. The curved surfaces 63
and 65 and the flared ends o~ the tube prevent damage to
the bag during installation, shrinking and operating
stages.
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nocket No. 0265-CI-PP
The tube 50 is constructed to pre~ent the emprisoned
rope, thus the edges of the bag, from b~ing latQrally
pulled out of the tube. Langitudinal movement o~ the
tube 50 is restricted by 'h3 clamping band 49 at the
lower end and the interlocking clip 14 at the upper end.
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