Improvements in Filtering Apparatus for Alcoholic Beverages.
Year: 1889

page_text: Date of Application, 22nd Aug., 1889
Complete Specification Left, 20th May, 1890-Accepted, 19th July, 1890
PROVISIONAL SPECIFICATION.
Improvements in Filtering Apparatus for Alcoholic Beverages.
I HEINRICH MUNDORF of Pfiffligheim near Worms in the Empire of Germany
Gentleman do hereby declare the nature of this invention to be as follows:-
My invention relates to an improved method of and apparatus for the filtration or
clarification of wines and other fermented liquors, in which the liquor is filtered
through paper, asbestos, or other analogous suitable material, and my said invention
has for its object to prevent the escaping of any unfiltered or only partly filtered
liquor, between the inner side of the filtering vessel and the filtering material (such
as paper or asbestos cakes etc.).
In carrying out my invention I employ an ordinary filtering tub, of any suitable
material, in which I cut out a ring of sufficient height and depth to receive a cake of
filtering material. In the notch thus formed, I insert a stripe of metal in such a way,
that one half of the metal strip is firmly wedged into the bottom of the notch--but
not quite close to the inner side of the tub-whilst the other half is free. This free
part has a very sharp edge, which is destined to be pressed against the filter mass-
consisting of paper, asbestos or other analogous filtering material-placed on it. The
pressure of the liquor on the paper or asbestos cake, will press the metal piece firmly
into these cakes and by causing the edge to press against the filtermass will close up
tightly, so that no liquor will rise over the edge.
The metalpiece will be entirely covered by the cake.
It will be clearly understood that any liquor, passing at the inner side of the vessel
and between the cake cannot escape downwards (being prevented from doing so, by
the edge of the metal strip)-but must be brought back again into the cake and thus
get filtered.
The greater the pressure of liquor on the paper, or asbestos cake, the tighter will
these materials be pressed into the metalpiece. To increase this pressure, I provide
my filtering tub with an airtight lid.
For supporting the filtercake, I place underneath it a fine wire gauze net (11 meshes
ta") and directly underneath this I place a coarser wire gauze net, which rests on a
suitable frame formed of small laths, supported on woodwork, whereby a great
filtering area is obtained.
Dated this 19th-day of August 1889
CHAS. W. J. NOLTE,
17, Coleman Street, E.C., Agent for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Filtering Apparatus for Alcoholic Beverages.
I, HEINRICH MUNDORF of Pfiffligheim near Worms, in the Empire of Germany,
Gentleman, do hereby declare the nature of this invention and in what manner the
same is to be performed, to be particularly described and ascertained in and by the
following statement:―
My invention relates to an improved method of and apparatus for the filtration or
clarification of wines and other fermented liquors in which the liquor is filtered
through paper, asbestos or other analogous suitable material. Several attempts have
been made to obtain a perfect filtering apparatus of the class hereinafter described;
that is to say a filter for wines and other fermented liquors, through which no unfiltered
fluid can escape between the ends or circunference of the filtering cake and the inner
side of the filtering vessel,

page_text: In apparatus where the filtering material (consisting of paper, asbestos or analogous
material) was placed on a perforated bottom such as wire net, cords or similar material
suitable for the purpose, a small stream of fluid which was only in part, or entirely
unfiltered, passed between the end or edge of the filtering cake and the side of the
filtering vessel.
This was clearly shewn, when on examining a filter cake after filtration, it proved
that the upper layers were filled with mucous matter etc., the lower ones being
free of it, whilst on the edge of the cake the mucous matter penetrated right through,
thus shewing that a very imperfect filtration only had been obtained.
The bottom of the filtering apparatus rested with its edge on a hoop, which could
not be fitted or attached perfectly airtight to the wall of the filtering vessel, so that
here also an escape of unfiltered fluid took place. Even when the latter evil was
remedied by cutting out a ring or groove in the inner sides of the filtering vessel
which was filled up with the filtering material, the mucous matter shewed at the edge,
thus proving that unfiltered fluid passed underneath the frame of the bottom of the
filtering material.
The object of this my invention is to prevent, by means of a suitable arrangement,
hereinafter fully described, the escaping of any unfiltered or partly filtered fluid,
between the inner side of the filtering vessel and the filtering material.
In the accompanying drawings
Fig. 1 shews a perspective view of my improved filtering vessel.
Fig. 2 a sectional elevation of same.
Fig. 3 a plan of the bottom on which the filtering material is placed and
Fig. 4 a sectional elevation of the filtering material with its bottom and part of
the side of the filtering tub or vessel.
The drawings are not to scale. Like letters refer to like parts in all the drawings.
A, is a suitable filtering tub or vessel, B, the lid thereof. C, bolts and nuts for
fastening down the lid. D, is the supply pipe with its cock. E, is a cock destined to
let off any air that may enter with the filtering cake. F is the filtering cake (or
material). G, is an india-rubber ring. L, is a frame composed of laths supporting
the bottom of the filtering material F, which consist of two wire nets, M and N,
(M the finer, N the coarse or wider meshed). R is a metalband or strip with its
sharp edge R. W, indicates the passage of the unfiltered stream through the cake F
and along the inner side of the vessel A.
In carrying out my invention, I employ an ordinary filtering tub or vessel A made a
of any suitable material, in which I cut out a ring of sufficient height and depth to
receive a cake of filtering material, F, or I construct the inside of my filtering vessel
so that the lower part forms a ledge on which the wire net M N with the filtering
cake rest, as shewn in figs. 1 & 2. In the notch thus formed, or the protruding lower
part of the vessel, I insert a strip or band of metal, R as shewn in figs. 1, 2 & 4 that
is to say in such a manner, that one half of the metal strip or band is firmly wedged
into the bottom of the notch or ledge but not quite close to the inner side of the
vessel, whilst the other half with its sharp edge is free. This sharp edge R¹ cuts
into the filter-mass, (consisting of asbestos, paper, or other suitable analogous
material) which through the pressure exercised by the fluid fills firmly round the free
or sharp edged end R₁ of the band R as shewn in figs. 1 & 4. It will be seen that
any liquor passing at the inner side of the vessel and between the cake cannot escape
downwards being prevented from doing so by the metal-strip R, but must be brought
back again into the cake to be filtered there.
The dotted line along the side in Fig. 4. will shew, how without this metal-band
the mucous matter etc., will pass between the side of the vessel and the edge of the
cake and into the filtered fluid below.
The greater the pressure on the filtering material the firmer will this material
become wedged between band R and the sides of the vessel, forming a fluid-tight ring
there.
For the purpose of obtaining a greater pressure, than
to be filtered, alone, could give, I provide my filtering
the weight of the fluid
vessel with an airtight

page_text: lid (see Fig. 2.) consisting of a suitable lid B, supplied with an india-rubber ring
which fits in a groove running round the top of the filtering vessel.
The lid is held down by means of bolts and nuts C (or by any other suitable
arrangement insuring an airtight fit of lid B).
In this lid I fit, (also airtight), the cock of the supply pipe D and another cock E,
which serves to let off any air, that enters through the supply pipe.
For supporting the filter-cake F I place underneath it a fine wire-gauze net M
(preferably 11 meshes in 12") and directly underneath this place another, but
coarser (ie. wider meshed) wire gauze net, N, which rests on a suitable frame L
formed of small laths and supported on woodwork (see Fig. 2.) or in any other
suitable way. By means of this arrangement I greatly increase the filtering area.
Having now particularly described and ascertained etc. I declare that what I
claim is ;
1. In filtering tubs or other similar filtering vessels, where paper, asbestos, or analogous
filtering material is employed, the use of a sharp edged metal-band or strip (R) let
into a notch or groove, cut out on the inner side of the filtering vessel or let into the
protruding lower part of such vessel, in such a manner that the filtering material
by the pressure of the fluid is firmly pressed around and against the band,
forming a fluid-tight ring between the band R and the inner sides of the filtering
vessel, for the purpose of preventing the escape of any unfiltered fluid at the side,
substantially as described hereiubefore with reference to the annexed illustrative
drawings.
2. In combination with the above improvement, the employment of a specially
constructed bottom for the filter-cake, consisting of a lath frame L, covered by a wide
meshed wire gauze net M, having another finer meshed wire gauze net N over it, for
the purpose of obtaining a greater filtering area, substantially as described herein-
before, with reference to the annexed illustrative drawings.
3. In combination with the improvements, claimed above, the use of a lid B,
secured airtight to the filtering vessel, by means of bolts and nuts (or any other
suitable arrangement), and for the purpose of increasing the pressure of the fluid, to
be filtered on the filtering material so that same may be firmly wedged between
band Rand side of vessel and become perfectly fluid tight, substantially as hereinbefore
described, with reference to the annexed illustrative drawings.
Dated this 20th day of Mev 1800
CHARLES W. J. NOLTE,
17, Coleman Street, London, E.C., Agent for the Applicant.