Improvements relating to the Treatment of Fibres, Yarns, and Fabrics to Imitate Silk.
Year: 1898

page_text: Date of Application, 19th May, 1893
Complete Specification Left, 15th Mar., 1899-Accepted, 19th May, 1899
PROVISIONAL SPECIFICATION.
Improvements relating to the Treatment of Fibres, Yarns, and
Fabrics to Imitate Silk.
I, EDUARD UNGNAD, of 52, Juliusstrasse, Rixdorf, 'Berlin, in the Empire of
Germany, Chemist, do hereby declare the nature of this invention to be as
follows:-
My invention relates to the treatment of fibres, yarns and fabrics to imitate
silk.
Silk is dissolved in an alkaline solution while heating, the fibres, yarns or
fabrics to be enriched are soaked in this solution, freed from any excessive quan-
tity of same, and then treated in a bath of alkaline bicarbonate in excess or
hung in a large chamber through which gases containing carbonic acid, for
instance washed products of combustion, are conducted.
The carbonic acid contained in the products of combustion, or in the alkaline
bicarbonate of the bath, combines with the alkali of the silk solution, converts
it into an alkaline carbonate, thereby depositing the silk from its solution on to
the fibre.
After drying the silk to the fibre the alkaline carbonate is lixiviated by warm
water, a portion of same is rendered caustic again by the addition of lime and
thus serves for dissolving fresh quantities of silk, whilst the other portion is
converted by the passage of products of combustion into alkaline bicarbonate
and, as hereinbefore stated, is used again as a bath for the deposition of the silk
on to the fibre, or the solution of bicarbonate is heated and carbonic acid expelled
from it, which gas, as set forth, may likewise be employed for saturating the
alkali and separating the silk.
J. LINCOLN & Co.,
75, Chancery Lane, London, Agents for the Applicant.
Improvements relating to the Treatment of Fibres, Yarns, and
Fabrics to Imitate Silk.
I, EDUARD UNGNAD, of 52, Juliusstrasse, Rixdorf, Berlin, in the Empire of
Germany, Chemist, 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:-
11
My invention relates to the treatment of fibres, yarns and fabrics to imitate

page_text: Silk is dissolved in an alkaline solution under heat. The fibres, yarns or
fabrics to be treated are soaked in this solution, freed from any excessive quan-
tity of same, and then treated in a bath of alkaline bicarbonate in excess or hung
in a large chamber through which gases containing carbonic acid, for instance
washed products of combustion, are conducted.
The carbonic acid contained in the products of combustion, or in the alkaline
bicarbonate of the bath, combines with the alkali of the silk solution, and con-
verts it into an alkaline carbonate, thereby depositing the silk from its solution
on to the fibre, yarn or fabric.
After drying the silk on the fibre the alkaline carbonate is lixiviated by warm
water, a portion of same is rendered caustic again by the addition of lime and
thus serves for dissolving fresh quantities of silk, whilst the other portion is
converted by the passage of products of combustion or carbonic acid gas into
alkaline bicarbonate and, as herein before stated, is used again as a bath for the
precipitation or deposit of the silk on to the fibre, or the solution of bicarbonate
is heated and carbonic acid expelled from it, which gas, as set forth, may likewise
be employed for saturating the alkali and separating the silk.
The process is carried out as follows:--
The silk is dissolved in a caustic lye of 35-40° Bé.
The proportional amount of silk dissolved may vary, as the degree of concen-
tration, has no influence in the result of the process. The yarns are pulled thrice
through it and freed from superfluous solution by pressing or centrifugal action,
dried and then brought into a large bath of 10° Bé. of bicarbonate of soda, pulled
through for to 12 hour, washed and dried. For finer yarns of an hour is
sufficient, thicker ones longer; after rinsing the yarns must be well separated
(chevilled).
The manipulation of woven fabrics is analogous; they are drawn through the
ye by means of well known machines then by means of suitable rollers freed
from superfluous solution, dried, then brought into the 10° Bé. bicarbonate bath
and pulled through it for of an hour or longer according to the thickness of
the stuff (till entirely neutralized).
They are best dried on stretching frames.
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 -
In the treatment of fibres, yarns and fabrics to imitate silk.
1. The exposure of the same to a solution of silk in an alkaline solvent and
afterwards to a solution of an alkaline bicarbonate in excess or to carbonic acid
gas otherwise obtained whereby the silk is deposited in the fibres, yarns or
fabrics.
2. The deposition of silk as described and the removal of alkaline carbonate
after drying by lixiviation in warm water.
3. For the preparation and use of silk solution the addition of lime to a
portion of the alkaline carbonate solution and of carbonic acid gas to another
portion of said alkaline carbonate solution for use as described.
13
1
1
1000
HERBERT HADDAN & Co.,
Agents to Applicant, 18, Buckingham Street, Strand, London, W.C.