Improvements in Filtering-plates, and in the Method and Apparatus for Manufacturing the same.
Year: 1892

page_text: Date of Application, 20th June, 1892
Complete Specification Left, 6th Mar., 1893-Accepted, 6th May, 1893
PROVISIONAL SPECIFICATION.
Improvements in Filtering-plates, and in the Method and Apparatus
for Manufacturing the same.
I, LORENZ ADAlbert Enzinger, of Worms, in the Grand-duchy of Hessia,
German Empire, Manufacturer, do hereby declare the nature of this invention to
be as follows:
My invention relates to filtering-plates to be used in filter-presses and especially
designed to be employed in the filter-press described in the Specification of my
British Letters Patent A.D. 1887 No 5982. The invention also comprises the
method of manufacturing the said plates and apparatus to be used therefor.
The improved plates are composed of a frame consisting in one or more com-
partments, each of which is provided inside with a surface or web, integral with the
frame or fixed thereto, and having one or more orifices, and a board of filtering-
material within which the said surface or surfaces is or are imbedded.
The method of manufacturing the plates consists in covering the inner surface
of the frame on both sides with a pulp of fibrous filtering-material and water, and
condensing the same upon the said surface, while water is expelled, by means of
permeable surfaces and pressure exercised thereon.
The apparatus for carrying out this manufacture consists in a lower and an
upper part, the lower part mainly comprising a perforated bottom-plate faced at
the top with fine wire-gauze, and a frame (bottom-frame) fitting around the latter
and adapted to slide up and down thereon, while the upper part mainly comprises
a frame (top-frame) resembling a box without bottom and top, and having
perforated walls, a perforated top-plate faced on the underside with wire-gauze
and fitting into the top-frame and a screw-press the spindle whereof carries the said
top-plate. The bottom-frame is carried by springs, which keep it raised, relatively
to the bottom plate, so long as there is no pressure on the same, and both said
frames, viz. the bottom-frame and the top-frame, are inside a little smaller than
the frame of the filtering-plate for which they are designed.
When the apparatus is to be used, the frame for the filtering-plate is placed on
the bottom-frame, and the top-frame on the former, a receptacle being thereby
obtained the bottom whereof is the perforated bottom-plate. The pulp of filtering-
material is thereupon run into the said receptacle, and the perforated top-plate is
introduced into the top-frame and screwed down on the pulp. By the pressure
thus produced, the greater portion of the water is gradually expressed from the
pulp, and when the latter is condensed to a certain extent a pressure will be
brought to bear from above on the perforated surface in the filtering-frame
through the medium of the pulp, whereby the bottom-frame and the filtering-frame
are pressed down against the force of the aforesaid springs, the top-frame following
by its weight. By these means 'the pulp is condensed uniformly on both sides
of the perforated surface in the filtering-frame, so as to form the filtering-board.
Dated the 20th day of June 3005

page_text: COMPLETE SPECIFICATION.
Improvements in Filtering-plates, and in the Method and Apparatus
for Manufacturing the same.
I, LORENZ ADALBERT ENZINGER, of Worms, in the Grand-duchy of Hessia,
German Empire, Manufacturer, do hereby declare the nature of said invention
and in what manner the same is to be performed, to be particularly described
and ascertained in and by the following statement:-
This ivention relates to filtering-plates to be used in filter-presses, and especially
designed to be employed in the filter-press for which I have obtained the British
Letters Patent A.D. 1887 No. 5982. The invention also comprises the method
of manufacturing the said plates, and apparatus to be used therefor.
The improved plates are composed of a frame consisting in one or more com-
partments, each of which is provided on the inside with a surface integral with the
frame or fixed thereto and having one or more orifices, and a board of filtering-
material within which the said surface is imbedded. The method of manufacturing
the plates consists in covering the inner surface of the frame on both sides with a
pulp of fibrous filtering-material and water, and condensing the same upon the
said surface, while water is expelled, by means of permeable surfaces and pressure
exercised thereon. The apparatus for making the plates according to this method
will be fully described hereafter.
In the annexed drawings
Figs. 1, 2, 3, 4, 5, 6 are views of filtering-plate frames of different arrangements.
Figs. 1, 2, 3, 4, 5 and 6. are transverse sections through the respective
frames provided with the filtering-boards.
Fig. 7 is a sectional elevation of the apparatus corresponding to line 7, 10,
Fig. 8, which is a plan, the upper pressing-plate being in these figures shown raised
and turned aside together with the parts carrying the same.
Fig. 9 is a side view with section of lower part, the pressing device being in
operative position.
Fig. 10 is a view showing a portion of Fig. 7 drawn to a larger scale, the parts
being, however, represented in different position.
Fig. 11 is a front view of the clasp de Fig. 9.
The frame F represented by Fig. 1 in about full size and adapted for use in
very small filter-presses, has but a single large orifice in the aforesaid surface, so
that of this surface, f, only a narrow strip or ridge is left, running in the middle
of the frame along its inside, and which becomes imbedded in the edges of the
filtering-board F1, Fig. 1A, when the latter is formed in the manner stated.
The frame F2, Figs. 2 and 2ª, is divided by cross-bars f¹ into four compartments
having each in the surface f one orifice, leaving narrow strips, as in the frame F.
Frame F3, Figs. 3 and 34, adapted for very large presses, is of the same character
as the foregoing, except that it is divided into a greater number of compartments.
In both frames the cross f, f will become imbedded in the filtering-boards together
with the surface-portions f.
In the frame F4, Fig. 4, the surface has a plurality of round orifices f³, so as
to form a kind of grating for carrying and sustaining the filtering-board F', Fig. 4^,
deposited on both sides thereof and extending through the orifices f³. Frame F³,
Figs. 5 and 5, differs from frame F only in this that the orifices f* are
rectangular.
In frame F, Figs. 6 and 6, the board-carrying surface f is constituted by a
ridge running along the inner side of the frame and a web f of coarse wire-gauze
attached to the ridge, the meshes of the gauze forming the said orifices.
The method of manufacturing the filtering-plates, i.e. of depositing the filtering-
material in the frames, has already been fully described in the foregoing.
The apparatus for carrying out this manufacture consists as shewn in

page_text: Figs. 7, 8, 9 and 10, of a lower part, mainly comprising the perforated plate G
faced at the top with fine wire gauze g², a perforated box-like stand A in which
plate G rests, and a frame T fitting around the edges of the plate G and adapted
to slide up and down thereon, while the upper part mainly comprises the perforated
frame E, the perforated plate D faced on the underside with wire gauze d² and a
screw-press, the spindle d³ whereof carries the plate D. The perforations and d¹
of the plates G and D are connected together on the face of the plates by
grooves g' and d, in view of facilitating the outflow of the water passing through
the sheets of gauze d² and g², and the plate G is provided at the bottom with ribs
in order to allow of free communication between its own perforations and those a¹
of the stand A. The water finally flows out through the funnels fitted in the
table S on which the apparatus is placed. The frames T and E are made of the
same form as the frames F to which they are to be applied, but they are inside a
little smaller than the latter, and on the inner edges of their respective upper and
lower faces, narrow ledges, t and e, are formed, adapted to project into frame F
when the frames E F and T are put together as shown in Figs. 7 and 10, the
frames being then prevented by the ledges from shifting one upon the other. The
frame T is guided by four posts 3 secured to the stand A and passing through
lugs t', and it is carried by springs t2 resting on the stand, the said springs operating
to keep the frame raised, relatively to plate G, so long as there is no pressure on
the same, as shown by Fig. 7. The screw-spindle d³ works in a beam d³ turning
on a post do, and which, when plate D is in operative position, can be secured at its
free end by the clasp de hinged at d³.
After the three frames T, F, E have been assembled, the pulp of filtering-
material is run into the space formed by the frames and the bottom plate G, beam d³
is swung around to fetch the top-plate D over frame E and is secured by clasp do,
and plate D is screwed down on the pulp. By the pressure thus produced the
greater portion of the water is gradually expressed from the pulp, and when
the latter is condensed to a certain extent, a pressure will be brought to bear on the
upper surface of frame F through the medium of the pulp, whereby frames F and T
are pressed down against the force of the springs t2, the frame E following by its
weight. By these means the pulp is condensed uniformly on both sides of surface f.
At the end of the operation the parts are in the position shown by Fig. 10, the
filtering-board F¹ being then free from water as far as this is requisite for its
employment in the filter-press, in which the plates are placed between frames
carrying sheets of gauze or cloth for sustaining the filtering-boards.
The material principally used for the said boards is paper-pulp. If boards of
greater permeability are required, these may be obtained by adding wood-pulp to
the ordinary paper-pulp, while by the addition of ground asbest the permeability is
reduced.
When the filtering power of the boards is exhausted, these are knocked out of
the frames and disintegrated by any suitable mechanical device in a current of
water with simultaneous introduction of steam. After the fibrous mass has thus
been reduced and purified, it is adapted for renewed use in filtering-plates.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is.
1. A filtering-plate composed of a frame consisting in one or more compartments,
each provided on the inside with a surface having one or more orifices, and a board
of filtering-material within which the said surface is imbedded, substantially as
described.
2. The method of manufacturing a filtering-plate composed of a frame consisting
in one or more compartments, each provided on the inside with a surface having
one or more orifices, and a board of filtering-material within which the said surface
is imbedded, the said method consisting in making a pulp of the filtering-material
and water, covering the frame on both sides of its inner surface with the said pulp

page_text: and condensing the same by means of permeable surfaces and pressure exercised
thereon, substantially as specified.
3. A press for manufacturing filtering plates composed of a frame consisting in
one or more compartments, each provided on the inside with a surface having one
or more orifices, and a board of filtering-material within which the said surface is
imbedded, the said press consisting in the combination of a stand A, a perforated
plate G, permeable surface g² applied to plate G, frame T fitting around plate G
so as to be capable of sliding thereon and upon which is placed the frame F of the
filtering-plate, springs 2 inserted between the stand A and frame T, perforated
frame E, placed on the frame of the filtering-plate, perforated plate D sliding in
frame E, permeable surface d2 applied to plate D, and means for pressing down the
plate D, substantially as described.
Mach 1902
J. H. JOHNSON & Co.,
Agents.