A Process for the Manufacture of Fabrics from Nitrated Yarns, chiefly Designed for Filtering Purposes.
Year: 1898

page_text: Date of Application, 8th June, 1898-Accepted, 9th July, 1898
A Process for the Manufacture of Fabrics from Nitrated Yarns,
chiefly Designed for Filtering Purposes.
I, EMIL MULLER, of 17, Victoria Strasse, Cologne, in the Empire of Germany,
General Manager, 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
This invention relates to the manufacture of nitrated cotton cloths adapted for
employment (amongst other purposes) for the filtration of acid liquids, as such cloths
offer greater resistance to aoids than cellulose fabric,
A process for the manufacture of an acid-resisting fabric for filtration purposes has
already been employed According to this process, cotton fabrics are first of all
treated with concentrated nitric acid and then with concentrated sulphuric acid
Nitrating the fabric in accordance with the methods hitherto usual in the guncotton
industry, that is to say the treatment of the fabric with a mixture of nitric acid and
sulphuric acid, has not so far enabled the production of a cloth capable of resistance
and adapted for the purpose of filtration.
The process forming the subject of this invention, and which 18 hereafter particu-
larly described, consists in nitrating cotton yarn by means of a mixture of nitric
acid and sulphuric acid, in rendering the gun-cotton produced from the yarn durable
by washing, in some cases after a preliminary boiling, and then weaving the yarn
into cloth.
This process possesses the important advantage over the methods hitherto em-
ployed, that it is possible to render the gun-cotton obtained exactly suitable for the
acids intended to be filtered Cloths manufactured by the process above referred to
which consists in separately treating the fabric with concentrated nitric acid and with
concentrated sulphuric acid, are, on the contrary, not suitable for many purposes,
because the degree of nitrating cannot be regulated according to requirements in
their manufacture, and because, for example, highly nitrated cotton becomes
de-nitrated in acid mixtures for the manufacture of collodion cotton wool.
The process of manufacturing gun-cotton fabric in accordance with this invention,
is as follows:-
The yarns intended for the warp and weft are treated in nitrating vessels in
accordance with the known process with a mixture of nitric acid and sulphuric
acid, completely freed from adherent nitric acid by means of a centrifugal
apparatus and then washed until the yain acquires sufficient durability for all
requirements as gun-cotton. The nitrated yarns are then woven in a wet condition
in accordance with the well known process.
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 I
claim is:-
1
A Trong for the manufacture of an cotton fabring consisting in nitrating

page_text: cotton yarns in a mixture of nitric acid and sulphuric acid suitable for obtaining
the required degree of nitrification and then weaving the same, after ample washing,
in a wet condition.
2. Filtering cloths manufactured in the manner described in Claim 1.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.