A New or Improved Process for Dyeing Yarn Roving with Indigo Blue.
Year: 1899

page_text: Date of Application, 2nd June, 1899-Accepted, 19th Aug., 1899
COMPLETE SPECIFICATION.
A New or Improved Process for Dyeing Yarn Roving with Indigo
Blue.
I, RICHARD BRANDTS, of M. Gladbach, Germany, Manufacturer, do hereby
declare the nature of this invention and in what manner the same is to be per-
formed to be particularly described and ascertained in and by the following
statement:
The present invention relates to a process for dyeing yarn roving uniformly
throughout with indigo blue.
The bobbin with the roving is first enclosed in a suitable envelope and it is
then saturated with indigo white. Then the enveloped bobbin is placed upon a
hollow spindle which is rotated about its own axis at a great velocity and which
is formed with a groove for supplying air thereto. In consequence of this rota-
tion about its own axis the indigo in excess is expelled by centrifugal action
and is recovered, whilst the oxygen of the air is drawn in a uniform manner
through the groove through the spindle from the inside towards the outside
thereof and acts to cause the indigo white (which remains behind in a uniform
distribution) to turn green uniformly throughout the entire cop. After this
conversion into green has been effected, water is forced by nieans of the hollow
spindle into the interior of the bobbin which is rotating at a high speed, so that
this water which is being continually expelled by centrifugal action produces a
uniform rinsing or washing of the bobbin. As soon as this rinsing or washing
operation is completed, the bobbin is dried thoroughly by centrifugal action
and is then finished.
The accompanying drawing illustrates one construction of apparatus for
carrying out the hereindescribed process.
a is the bobbin surrounded by yarn roving. The indigo (vat) liquor is forced
through the aperture d in the plate c into the bobbin in the direction of the
arrow (Figure 1). The bobbin is provided with a casing formed with perfo-
rations. The bobbin is held firmly on the hollow spindle e by means of the
screw nut . Then the bobbin when fixed on the spindle e is caused to rotate
rapidly by means of the driving mechanism f. In this manner air enters in
the direction of the arrow through the groove k in the spindle e and finds a
path through the perforated hollow spindle which is slipped over the spindle e.
The air then being forced by the liquid which is leaving the bobbin owing to the
rotation, enters the bobbin so that the oxygen can pass from the inside to the
outside, and a uniform and complete conversion into green can take place.
After the conversion into green, water is passed through the bobbin as above
stated, whilst the bobbin is being kept in continuous rotation. In this way the
indigo is thoroughly rinsed. In this operation the water passes through the
holes from the spindle into the bobbin.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed,. I declare that what
I claim is
(1) A new
or improved process for dreino varn roving with indivo blue

page_text: characterized by the fact that an encased cop of roving is impregnated with
indigo white, and then each bobbin is rotated about its own axis, or is subjected
to centrifugal action, after which water is admitted thereto for rinsing, the
object being to allow the oxygen for conversion into green to pass through the
bobbin from the inside to the outside, and thereby produce a uniform indigo
blue throughout the entire bobbin, as set forth.
(2) The improved apparatus for carrying out the process as claimed, substan-
tially as herein before described and shown.
Dated this 2nd day of June 1899.
ROBERT E. PHILLIPS, Assoc.M. Inst.C.E., M.I.Mech. E.,
Chartered Patent Agent,
70, Chancery Lane, London, W.C., Associate Agent.