A New or Improved Filtering Bag for Breweries, Distilleries, and the like purposes.
Year: 1892

page_text: Date of Application, 24th May, 1892—Accepted, 24th May, 1893.
COMPLETE SPECIFICATION.
A New or Improved Filtering Bag for Breweries, Distilleries, and the
like purposes.
I, JULIUS GEORG MÜLLER of 194 Bahnhofstrasse, Garmisch, Bavaria, in the
Empire of Germany, Manufacturer, 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 :-
The object of this invention is to provide an improved filtering bag for brewing
distilling and other purposes.
According to my invention such filtering bag is made of strong cotton fibres
forming the pointed end thereof having a length of 10 centimetres or thereabouts
and knitted to form a small cap, and of cords laid horizontally or spirally and
composed of chemically purified asbestos that is to say of asbestos which: is freed
from fatty matters these cords being connected together by strong cotton which
connection is effected by knitting.
The top of the bag is provided with rings (advantageously four in number) to
suspend the same in the filtering bag holder these rings being fixed to the material
of the bag by strong pieces of tin plate or equivalent which are secured on by
means of nuts and bolts.
From the point of the bag a cord is drawn inwardly and is terminated outwardly
by a loop which is used to raise the sack in case it becomes clogged in the course of
a filtering operation.
The advantages of my filtering bag (that is to say the improvements which it
embodies) are firstly that it consists partly of asbestos which had not hitherto been
used for making such bags.and which produces very favourable results.
A second important improvement is that the bag is perfectly seamless and hence
requires no strapping or strengthening bands.
The filtering bags hitherto used were formed (as the production of conical shapes
by weaving was impossible) of angular cut pieces which were sewn together and
furnished outside with strengthening straps bands or belts. These bags could not
accordingly be conveniently cleaned in a thorough manner, remains or refuse from
filtering operations adhering thereto and forming in the seams and straps, or bands
troublesome small fungoid growths which could hardly be removed by constant
brushing and jeopardized the solidity of the webbing or fabric of which the bag was
made.
These defects are entirely remedied by my improved article as the bags need only
be boiled to thoroughly clean them.
My improved filtering bag is knitted in a conical form by means of a machine
constructed for this purpose and hence is seamless and free from bands which were
required for ordinary as heretofore made bags in order to impart the necessary
strength thereto and to allow the load or weight of the beer or other liquid being
filtered to bear only upon the handle or frame thereof. The strengthening bands
used which consisted nearly all through of hemp or jute were rendered clammy and
fusty by constant exposure to the moisture and thus promoted the production of
mould or mildew.
The material of which my bag is made is so strong in texture (which is about
7 m thick) as to readily support when entirely full the weight of the material to
be filtered without the aid of receptacles made of iron rings and metallic gauze
which are generally used to surround and support ordinary bags.
The stretching of the full bag in a longitudinal sense which acted so injuriously
on bags owing to the cross meshes being opened under the weight and interfered

page_text: with the filtering process is prevented with my improved article the meshes being
knitted at right angles to the asbestos cords.
Owing to the strong asbestos cords which remain steady describing spirals
around the bag the latter cannot be stretched in the sense of its width.
The rings secured to the top of the bags are not fixtures as heretofore but can
be replaced by others consisting of the parts mentioned at the commencement of
this description..
The bag consisting only of asbestos and cotton (both of which materials expand
and contract uniformly under changes of temperature) the hottest liquids can be
filtered through the same without causing any shrinking of the bag.
The peculiar nature of the fabric or the combination or intertwining of the
threads is a guarantee that the most efficient filtration of all liquids can be
obtained.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what [
claim is :-
:-
f
1. A filtering bag for brewing distilling or the like purpose constructed by
knitting asbestos and well twisted cotton into a seamless bag conical of shape
substantially in the manner and for the purposes hereinbefore set forth.
2. A seamless conical filtering bag for brewing distilling and other like purpose
constructed of strong asbestos cord and of well twisted cotton for the purpose of
obtaining a quicker and cleaner filtration than heretofore and preventing the bag
from becoming mouldy substantially as herein before set forth.
נ..
1000
TONGUE & BIRKBECK,
34, Southampton Buildings, Chancery Lane, London, 'W.C.,
Agents for the Applicant.