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Патент USA US3042486

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July 3, 1962
E. ROHNER
3,042,476
METHOD FOR DUPLICATING THE DYE OF‘
AN ORIGINAL ON A, DYE CARRIER
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Filed March 21, 1960
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July 3, 1962
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July 3, 1962
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METHOD FOR DUPLICATING THE DYE OF‘
AN ORIGINAL‘ ON A DYE CARRIER
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United States igatent @ii'ice
3,042,475
Patented July 3, 1962
31
mi
3,042,476
FIGURES 5, 6 and 7 show the concentration curves
of the three primary-color dyes, each at a chosen wave
METHGD FGR DUPLICATING THE DYE OF AN
QRIGINAL ON A DYE CARREER
Ernst Rohner, Zurich, Switzerland, assignor to
Pretema A.G., Zurich, Switzerland
Filed Mar. 21, I060, Ser. No. 16,485
Claims priority, application Germany Mar. 24, 1959
3 Claims. (Cl. 8-25)
length.
The following example will be based on the assump
tion that the original dyestuff which is to be duplicated
contains the primary-color dyes, blue, scarlet, and yel~
low.
The spectral re-emission curve No. 1 of FIGURE
1 is known. The above-mentioned primary-color dyes
are ?rst applied to the dyeable dye carrier material in
‘It is known that when duplicating the dye mixture of
various concentrations (in the example of the present
an original, the requisite recipes are determined by sub 10 invention, according to FIGS. 2 to 4 incl., in concen
jective, visual methods. In such a method, mixing pref
trations of 0.01%, 0.1% and 1.0%). It is advantageous
erably proceeds from a known recipe which is visually
to carry out this dyeing operation within a concentration
as similar to the original as possible. The desired dye
range of 0.005% to 2.0%. From these samples, the
recipe which most closely approximates the original, is
curve of the re-emission, R, in percent, carried over the
15
obtained by this method after a time-consuming series of
wave-length of the spectral re-emission curve (FIGS. 2
color corrections.
4 incl.) can be determined, whereby FIG. 2 shows the
It is further known that the requisite dye recipes can
re-emission curves a for the blue primary‘color dye’stu?,
be determined graphically or computationally by methods
FIG. 3 shows the re-emission curves c for the primary
based on the Kubelka-Munk law.
This law is, however,
color dyestuff scarlet, and FIG. 4 the re-emission curves
of only limited validity when applied to practical dyeing 20 b for the primary-color dyestu?f yellow. From these
processes, since the factors which greatly in?uence the
emission curves, a, b, c, a number of Wavelengths are
variable characteristics of the various dye carriers, for
chosen which represent the number of these basic colors,
example, textiles, plastics, paper, etc., are not considered
and by comparison of these three graphic representations, ’
in the computations. In addition, the variations of the
2 to 4 incl., those Wavelengths are chosen, in which the
25
conditions in dyeing technology cannot be taken into con
proportion of one primary-color dye to the other primary
sideration with su?icient accuracy. Both these consider
color dyes is at a minimum. :It is evident from FIGS.
ations, as well as the considerable amount of computa
2 to 4 incl. that the re-emission of the primary-color
tion necessary, make the practical‘utility of these methods
dyestuff, blue, is at a minimum with respect. to the re
questionable, so that a successful production, which more
emissions
of the other two primary-color dyestuffs, yellow
or less resembles the original, is achieved only after 30 and scarlet at A 640 mp. ‘It is to be noted, that the choice
tedious correction ‘by highly skilled personnel.
The method of the present invention avoids the dis
advantages of the visual as well as of the graphic and
computational methods of recipe determination for dupli
cation of dye exemplars.
_
The method according to present invention comprises
applying a number of primary-color dyestuffs, in ‘a plu
rality of dyestu? concentrations to the same dye carrier
does not depend on the smallest absolute value of the
blue primary-color dyestuff (this is approximately at
A 600 mp), but upon the ratio of this re-emission to the
35 re-emissions of the other dyestu?s.
It may also be seen
from FIGS. 2-4 incl. that the minimum ratio for the
primary-color dyestuff scarlet is at A 510 mp, and for the
primary-color dyestu? yellow, at A 404 mp.
Now the three wave-lengths of the lre-emission values
to be dyed, determining from these samples the spectral
of the three basic dyes, chosen by the above method,
re-emission curves, determining the spectral emission 40 can be represented graphically as ‘a function of the dye
curve of the original dye mixture, selecting from the
stu?’ concentration, K. This can be accomplished most
spectral re-emission curve of the primary~color dyes the
advantageously by logarithmic means, as in the illustrated
number of wave-lengths corresponding to the number of
example. FIGS. 5, 6 and 7 show the concentration
the primary-color dyes, wherein the ratio of the re-emis
45 curves A, for blue, B, for yellow, and C for scarlet at
sion of one primary-color dye to the ratios of the re
emissions of the other primary-color dyes is a minimum,
tracing graphically for these wave lengths the re-emission
values of the primary-color dyes as a function of the
dye-bath concentration, determining from these graphs,
the respective wave-lengths A 640 rnp, A 404 mp and
A 510 mp. The recipe for the duplicating dye mixture
can now be determined from these concentration curves.
According to the re-emission curve of the original dye,
50 as shown in FIG. 1, a total re-emission of 127% is re
the bath concentration of the individual dye components
quired at wave-length A 640 mp. Since, as shown in
of the dye mixture at the re-ernission values correspond
FIGS. 2-4 incl., the primary~color, blue, is the sole de
ing to the wave-lengths of the original dye mixture, mix
cisive factor, the concentration K which represents a
ing the dye components in the determined concentration,
re-emission R equal to 27% is sought in curve A of FIG.
and dyeing the dye carrier with this mixture of dyes.
55 5, and yields a concentration for blue of 0.058%. . Ac
In the novel method of the present invention, the dye
cording to the curve 1 of FIG. 1, the ‘dye sample has a
recipes can be determined with a high degree of accuracy
re-emission value at wave-length A 510 mp of 37.5%,
Within a few minutes, and the subsequent dyeing process
and as shown by FIGS. 2‘~4 incl., the prime vfactor in
can be considerably shortened as compared with pre
the re-ernission at this wave-length is the primary color,
viously known methods. This results in a better utiliza
tion of the dyeing machines and a correspondingly in
creased productivity.
The invention will be more fully described with refer
ence to the accompanying drawings showing diagrams
60 scarlet.
It must ?rst be assumed that the re-emission
value of 37.5% is produced by the dyestuff scarlet alone,
and on this assumption, the concentration of scarlet, K,
of 0.035, representing the re-emission value, R, of 37.5%
is found in curve C of FIG. 6.
>
which are required for carrying out the individual steps
Since, however, according to FIG. 6 the primary-color
65
of the present invention.
dyestufE blue, actually has a considerable in?uence on
FIGURE 1 shows the spectral re~emission curves of
the real re-emission of the duplicating dye in the 510
the original dye and the duplicate, drawn as function of
mp. range, the value K=0.035% ‘for the scarlet dye con
the wavelength.
centration must be corrected accordingly. The previ
FIGURES 2, 3 and 4 show each the spectral re-ernission
ously determined dyestulf concentration. 0.05 8% for blue
70
curves for a primary-color dye at various dyestu? con
(curve A), gives, as shown ‘by FIG. 6, a corresponding
centrations.
dyestu? concentration for scarlet of 0.029%. For scar
3,042,476
3
4
let, therefore, only the difference in the concentrations
longer 0.006%, but 0.011% for the corrected scarlet
at wave-length 510 mp. is required, i.e. 0.006%, in order
to obtain the desired emission value of 37.5%. The
concentration.
determination of the requisite dyestuff concentration at
wave-length 404 mp. can beaccomplished in an analogous
manner. According to curve 1, FIG. 1, the original
dyestuif requires a re-ernission value of 45% at this wave
length. This, according to FIG. 7 (curve B), represents
a concentration of the dyestu?? of 0.0155 % for the pri
mary-color yellow. It can further be determined from
FIG. 7, that the wave-length of 404 my, and the ‘known
blue dyestu? concentration of 0.058% represents a yel
In this manner, a corrected recipe is ob
tained which now duplicates the dyeing characteristics of
the original dye with considerably more accuracy. A
single test dyeing with subsequent correction is su?icient
in all cases occurring in practice, thus eliminating the nu
merous test dyeings and corrections by skilled personnel
which were necessary until now, saving labor, material
and permitting the employment of personnel of a lesser
degree of skill, since the duplication of a color no longer
depends upon the skill of the persons who proceed to the
correction of the test dyeings.
I claim:
low dyestu? concentration (curve B) of 0.0095%. The
1. A method for duplicating 1a master dyeing obtained
in?uence of the known scarlet dyestuff concentration
(curve C) of 0.006% at wave-length 484 mg is very 15 from :an original dye mixture on a given dye carrier ma
material, which comprises
’
.
small, and is, as FIG. 7 indicates, at the most or the order
(l) dyeing samples of said dye carrier material, each
of 0.001%. The corrected dyestuif concentration for
with one ‘of \a determined number of different pri
yellow can be derived therefore from the difference be
mary-color dyestuffs in one of a determined number
tween the total theoretical concentration of yellow, and
‘of di?erent dyestu?‘ concentrations, whereby indi
the concentrations due to the in?uence of the ‘blue and
vidual samples of each primary-color dyestulf in
scarlet. This is, 0.0155—0.0095-0.001=0.005%.
each dyestu? concentration is obtained;
Since the in?uence of the primary-color dyestuff yel
low was ignored in the determination of the concentra
tion of the scarlet dyestuff, a check must be made after
(2) measuring and plotting against wavelength the
the dyestuff concentration of the yellow has been deter 25
mined, to ascertain if disregarding the in?uence of the
(3) measuring and plotting against wavelengths the
yellow on the scarlet was permissible. In the above ex
ample, as shown by FIG. 6, this was the case. Should
(4) plotting against dyestu?’ concentration those re
the in?uence of the yellow dyestu?” concentration be sig
ni?cant, then the concentration which was ?rst found. 30
for scarlet must be corrected in a known manner, ac
cording to FIG. 6, and this constitutes a check on the
concentration of the yellow dyestuif.
spectral re-emission values of each of these samples;
spectral emission values of said master dyeing;
ernission values taken from the curves obtained by
(2) which correspond to the wavelengths for which
the re-emission ratio of each primary color propor
portion-ate to the remaining primary colors has a
minimum value;
'
(5) preparing a dyebath of :a mixture of all of said
A second correction of the concentration of the yellow .
primaryacolor dyestuffs’ containing each dyestuff in
dyestuif by correction of the concentration of the scarlet 35
dyestu?, is, however super?uous in most cases in prac
that concentration which corresponds in the curves
tice, a fact which can be immediately concluded from
FIG. 7.
from the curve obtained under (3) for the wave
The recipe for the duplicate dyestu?’ ‘for the above
example accordingly is as follows:
obtained under (4) to the re-emission value taken
length corresponding to the said re-emission minimum
ratio of the respective primary color, and
(6) dyeing goods of the said dye carrier material, there
Percent
by obtaining dyeings substantially duplicating said
Dyestutf concentration for blue ______________ __ 0.058
Dyestu? concentration for scarlet ____________ __ 0.006
Dyestut‘f concentration for yellow ____________ __ 0.005
master dyeing.
2. The method claimed in claim 1, wherein there is
?rst prepared a bath of the primary-color dyestutf of that
concentration which corresponds in the curve obtained
The spectral re-emission curve of the duplicate dye 45 under ( 4) to a re-emission value which is closest, for the
of this recipe is shown by‘ curve 2 of FIG. 1. The cor
wavelength of that color, to the re-emission value her the
respondence is good, ‘and lies within the range of prac
same wavelength in the curve obtained under (3), and
tical tolerance. The slight deviations derive from a cer
‘adjusting the concentration of each of the other primary
tain mutual in?uence which‘the used dyestu?fs have upon
co-lor dyes with respect to the proportion of the re-emis
each other. The deviations can, if necessary, be elimi
sion values of the other primary-color dyes at their re
nated by means of a single correction, utilizing the above
spective wavelengths, thereby attaining concentrations cor
described methods based on FIGS. 5 to 7.
responding substantially entirely to the re-emission values
A test dyeing is carried out with the primary-color
of the curve under (3).
dyes, and the curves of the primary dyes will only be
3. A method as claimed in claim 1, in which after de
correct if each of the dyes have been completely taken
termination of the primary-color dyestu? concentnations,
up by the dye carrier material. In dyeing the dye car
a test dyeing is carried out, the test re-emission curve is
rier with the dye mixture, on the other hand, this is not
determined and plotted, and then the concentrations of the
necessarily the case, and much depends upon the nature
primary-color dyebaths are adjusted in accordance with
of the material of which the dye carrier is made. Thus,
the di?erences in the re-emission values between said test
for instance, wool absorbs considerably more dyestuif 60 re-emission curve and the re-emission curve of the original
than do synthetic ?bers. With the latter material, a
dyestu?' mixture, at the wavelengths at which they were
somewhat lighter coloration is obtained, as is evident in ' determined.
curve 2 of FIG. 1. Thus, for example, a sample re
quires a re-emission of 37.5% (curve 1) at wave-length
References Cited in the ?le of this patent
510 me, while the duplicate dyeing, as shown in curve 2, 65
gives a re-emission of 40% at this wave-length. From
FOREIGN PATENTS
FIG. 6, it is evident that a ‘re-emission of 40% (instead
506,258
Great Britain _________ __ May 24, 1939
of 37.5%) would give a scarlet concentration of only
620,768
Great Britain _________ __ Mar. 30, 1949
0.03, instead of 0.035. The di?erence, therefore is no
kkw l
.
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