A New Process for Dyeing Cotton.
Year: 1899

page_text: Date of Application, 30th June, 1899
Complete Specification Left, 7th Mar., 1900-Accepted, 7th Apr., 1900
A New Process for Dyeing Cotton.
I, HENRY EDWARD NEWTON, of the Office for Patents, 6, Bream's Buildings,
Chancery Lane, in the County of London, Patent Agent, do hereby declare the
nature of this invention to be as follows:-
-
My foreign correspondents have found a new and continuous process for dyeing
cotton fabrics or yarns, by which it is possible to dye the cotton material deep
shades, without passing the same more than once through the dye bath.
The chief characteristic of the new process is that the cotton material, before
being allowed to enter into the dye-bath, is caused to pass through a dilute
caustic lye. In performing this process, it is necessary to use caustic lyes of
such a strength that a mercerisation, and thereby a shrinking of the cotton
material, would not result.
In carrying out the new process practically, my foreign correspondents may
proceed in the following manner:-
The material is caused to pass successively through four dyeing vessels, which
are provided with rollers. The first vessel contains the caustic lye, for instance,
a soda-lye of 12 degrees Baumé. In the second vessel, which is provided with a
suitable apparatus for rinsing, the excess of soda-lye is removed from the cotton
fabric. The third vessel contains the boiling dye-bath, which has been prepared
from about 200 litres of water, 8 kilos., by weight, of "direct deep black G,"
and 35 kilos., by weight, of crystallized sodium sulphate. In the fourth vessel,
the cotton material is rinsed. After having passed this last vessel, the cotton
material is ready for being dressed or finished in the usual way.
:
The shade thus obtained on the cotton fabric is a beautiful deep black.
The process can be performed in an analogous manner, on using other sub-
stantive coloring matters.
Of course, my foreign correspondents do not intend to confine themselves to
the particulars given in the example, as these can be varied within wide limits.
Dated this 30th day of June 1899.

page_text: 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 foreign correspondents have found a new and continuous process for dyeing
cotton fabrics or yarns, by which it is possible to dye the cotton material deep
shades, without passing the same more than once through the dye-bath.
The chief characteristic of the new process is that the cotton material, before
being allowed to enter into the dye-bath, is caused to pass through a dilute
caustic lye. In performing this process, it is necessary to use caustic lyes of
such a strength that a mercerisation, and thereby a shrinking, of the cotton
material, would not result.
In carrying out the new process practically, my foreign correspondents may
proceed in the following, manner:
"
The material is caused to pass successively through four dyeing vessels, which
are provided with rollers: The first vessel contains the caustic lye, for instance,
a soda lye of 12 degrees Baumé. In the second vessel, which is provided with a
suitable apparatus for rinsing. the excess of soda lye is removed from the cotton
fabric: The third vessel contains the boiling dye-bath, which has been prepared
from about 900 litres of water, 8 kilos., by weight, of "direct deep black G,"
and 35 kilos., by weight, of crystallized sodium sulphate. In the fourth vessel
the cotton material is rinsed. After having passed this last vessel, the cotton
material is ready for being dressed or finished in the usual way.
The shade thus obtained on the cotton fabric is a beautiful deep black.
The process can be performed in an analogous manner, on using other sub-
stantive coloring matters.
Of course, my foreign correspondents do not intend to confine themselves to
the particulars given in the example, as these can be varied within wide limi's..
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed, as communicated to
me from abroad, I declare that what I claim is:-
The process for dyeing cotton continuously, which process consists in first
treating the cotton material with a dilute caustic lye, removing the excess of
alkali, and then dyeing the same in one of the manners known and in use for
dyeing by means of substantive dye-stuffs, substantially as hereinbefore described.
Dated this 7th day of March 1900.
NEWTON & SON,
Agents for the Applicant.