IMPROVEMENTS IN MAKING AND WORKING FILTER-PRESSES
Year: 1884

page_text: I, JAMES PEDDER, of Appleton-in-Widness, in the County of Lancaster, Joiner,
do hereby declare the nature of my invention for IMPROVEMENTS IN MAKING AND
WORKING FILTER-PRESSES to be as follows :—
My present invention relates to an improved method of abstracting the valuable
properties from manganese liquor, sacharine liquor, and other fluids or semi fluids in
which valuable matter is present, and for which purpose presses are used in which
the plates are placed in a vertical plane having what is known as a central feed.
In commencing operations the liquor is forced into the cells of the press and
through the filtering cloths, until the cells are filled to a suitable height with solid
matter stopped back by the cloths. The liquor is then turned off, and a quantity of
cold or hot water or other suitable solvent is passed through the press as often as
may be required to abstract the valuable residue, after which the cakes are removed
from the cells.
The outer flanges of the plates are jointed by a roll of flexible material laced to a
bead on one face of each plate. The filter cloths are secured by metal rings or
frames which jam them within the outer flanges forming the cells and within the
feed orifice of each plate. The latter arrangement keeps the cloths close to the face
of each disc, and allows the process to be worked at the necessary pressure without
tearing the cloths.
B. D. HEALEY,
Agent for Applicant,
18, Trafford Chambers, Liverpool.

page_text: JAMES PEDDER of Appleton-in-Widnes, in the County of Lancaster, Joiner, do
hereby declare the nature of my invention for IMPROVEMENTS IN MAKING AND
WORKING FILTER-PRESSES, and in what manner the same is to be performed, to be
particularly described and ascertained in and by the following statement :-
My present invention relates to an improved method of abstracting the valuable 5
properties from Manganese liquor, Sacharine liquor, and other fluids in which
valuable matter is present, and for which purpose presses are used in which the
plates are placed in a vertical plane having what is known as a central feed.
In commencing operations the liquor is forced into the cells of the press and
through the filtering cloths, until the cells are filled to a suitable thickness with 1
solid matter stopped back by the cloths. The thickness of the cakes is gauged by
a tappet rod with a disc on inner end passed through the feed end of the press, and
two thin cakes are formed in each cell one against each filtering cloth. The liquor
is then turned off and a quantity of cold or hot water, or other suitable solvent is
passed through the cakes in the press as often as may be required to abstract the 1
valuable residue, the washing liquor entering between the cakes in each cell, after
which the cakes are removed from the cells.
In carrying out my experiments I have found that the most suitable solvent is
Hydrochloric acid diluted with water until it registers one on what is known as
Twaddle's gauge, after which steam is forced through the liquid until heated to
about 200° Fahrenheit. In order to thoroughly abstract the residue from the cakes
I repeat the washing by passing another quantity of Hydrochloric liquor through
the cakes.
The outer flanges of the plates are jointed by a roll of flexible material laced to a
bead on one face of each pláte. It is obvious that a roll packing secured to both
faces of alternate plates would answer the same purpose. The filter cloths are
secured by metal rings or frames which jam them within the outer flanges forming
the cells and within the feed orifice of each plate. These rings may be welded or
not and may be formed in half rings the ends. butting firmly together. For
handiness in removing the rings, they have two or three holes each, in which to
insert a bar or lever when cloths require cleaning or when worn out. The latter
arrangement keeps the cloths close to the face of each disc, and allows the process
to be worked at the necessary pressure without tearing the cloths."
And in order that my invention may be understood, I will now describe it with
reference to the sheet of drawings accompanying this specification, like reference
figures being used to denote the same or similar parts where repeated on the
different diagrams.
30
Figure 1'is an elevation of a press plate, figure 2 is a section of same with single
roll joint, and figure 3 is a section with double roll joint on alternate plates.
Figure 4 is a section of large ring and figure 5 is a section of small ring for securing
the filter cloths. Figure 3 also shows the tappet rod or guage for ascertaining the
thickness of the cakes.
A ring of flexible packing 1 is laced to the bead 2 on face of outer flanges 3. A
sheet of gauze is placed over the grooved part of each disc in the usual way, and
this is covered by a sheet of filtering cloth. The latter is pressed into the inner
corner of each cell by the large rings shown by figure 4, and into each face of the
feed orifice. 4 by the small rings shewn by figure 5. The tappet rod 5 passes through
a suitable gland 6 and carries a disc 7 by the movement of which the thickness of

page_text: the cakes is ascertained. In practise the cells are not allowed to be filled with solid
matter but a space of about half an inch is left between the cakes so that the
washing liquor may freely enter into the cakes.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is
First. Making and using filter press plates with a roll joint of flexible material
laced to a bead substantially as herein shewn and described.
Second. Making and using filter press plates with rings or frames for securing
the cloths therein substantially as herein shewn and described.
Third. Abstracting valuable products from the cakes before they are removed
from the filter pross cells by the washing process herein described.
Dated this eighth day of November 1884.
JAMES PEDDER.