CN113326464A - Method for evaluating dye intensity based on color depth formula - Google Patents

Method for evaluating dye intensity based on color depth formula Download PDF

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CN113326464A
CN113326464A CN202110665370.7A CN202110665370A CN113326464A CN 113326464 A CN113326464 A CN 113326464A CN 202110665370 A CN202110665370 A CN 202110665370A CN 113326464 A CN113326464 A CN 113326464A
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杨红英
谢宛姿
杨志晖
张靖晶
周金利
武宗文
卢士艳
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Abstract

The invention belongs to the field of color science, relates to a method for representing and evaluating dye intensity based on a color depth objective evaluation formula, and particularly relates to a method for evaluating dye intensity based on a color depth formula. The invention provides a method for representing and evaluating dye strength based on a color depth formula, provides an objective, direct and universal method for representing and evaluating dye strength and pigment tinting strength, and the result is more accurate than the current standard. The invention characterizes formula Yang to the color depth according to the color scientific theorynThe application performance of the method is theoretically analyzed and experimentally researched, and the formula can be used for calculating the color intensity value and the dye intensity. The technology of the invention and the application thereofRelates to the fields of spectrophotometry, chromaticity, pigment production and coloring, textile printing and dyeing processing and the like.

Description

Method for evaluating dye intensity based on color depth formula
Technical Field
The invention belongs to the field of color science, and relates to a method for characterizing and evaluating dye intensity (also known as dye relative intensity and dye strength) based on a color depth objective evaluation formula, in particular to a method for evaluating dye intensity based on a color depth formula.
Background
Definition of dye intensity. The dye strength refers to the color-imparting ability of a dye to other materials, and is generally characterized by the color-imparting ability of a certain dye relative to a standard substance thereof, also called the relative strength of the dye (relative strength of dye/color, or relative color strength), commonly called the dye strength. The dye intensity is one of important evaluation indexes of the dye, and only by accurately measuring the dye intensity, the dye with high quality can be produced and the dye can be efficiently utilized. According to the nomenclature of GB/T6687 dye noun, the relative intensity of a dye, commonly referred to as the intensity of the dye, indicates the ratio of the ability of a dye to impart color to a substrate relative to the ability of a dye standard to impart color; the ratio of dye standard to sample usage, expressed as a percentage, is typically used to achieve equal depth of dyeing.
It can be seen that the dye intensity depends on the depth of dyeing and the amount of dye used. The calculation method of dye intensity is different from domestic and foreign standards.
According to GB/T6688 Instrument for measuring relative intensity and color difference of dye, the relative intensity of dye is the ratio of the dye dosage of a sample and a standard sample when the sample and the standard sample are dyed to equal color depth. The dyeing depth of the sample and the standard sample needs to be controlled according to the standard depth of 1/3 in GB/T4841.3-2006, and the depth of the sample and the standard sample is close to the depth of the standard sample as much as possible. The national standard provides two methods, as follows.
The national standard method one: K/S calculation method
The method is suitable for the condition that the sample and the standard sample have the same or similar color light and the maximum absorption wavelength is the same by visual inspection, and is not suitable for the condition that blended dyes, dyes with more than two absorption peaks or no obvious absorption peak and the condition that the sample and the standard sample have the same color light by visual inspection but the reflection curve has different maximum absorption wavelengths (metamerism). In addition, the color depth difference of the sample from the standard sample is not more than 10%, otherwise, the dyeing concentration of the sample or the standard sample is adjusted to prepare a dyed sample again, so that the color depth is as close as possible.
The relative intensity of the dye to be measured is measured in ST, and the value is expressed in minutes (or%) and calculated according to the formula (1):
ST＝100f2/f1 (1)
in the formula: f. of2-the Kubelka-Munk function value at maximum absorption for the sample of unit stain concentration;
f1-the Kubelka-Munk function value at maximum absorption for the standard per unit staining concentration.
f＝(K/S)max/C (2)
K/S＝(1-R∞)2/2R∞ (3)
In the formula: (K/S)max-the Kubelka-Munk function value of the dye sample at the maximum absorption wavelength;
c-dyeing concentration;
R∞-reflectivity of a completely opaque body.
It is clear that the essence of method one is to require that the color depth of the sample and standard be near 1/3 and not more than 10% different, and then to determine the ratio of unit concentration K/S of the sample and standard, expressed in minutes (or%).
And the national standard method II comprises the following steps: method for calculating K/S and pseudo-tristimulus values based on integration
The method is suitable for all situations of obtaining the relative strength of the dye. The color depth of the sample and the standard sample is not more than 10 percent, otherwise, the dyeing concentration of the sample or the standard sample is adjusted to prepare a dyed sample again, so that the color depth is as close as possible.
Kubelka-Munk function value of a sample at a certain wavelength lambda is expressed as F(λ)Calculating according to the formula (4):
Figure BDA0003117144720000021
in the formula: r∞(λ)-reflectance of the dye sample at wavelength λ;
Figure BDA0003117144720000025
-reflectance of the blank at wavelength λ.
The pseudo-tristimulus value of the stained specimen is calculated by using the Kubelka-Munk function value, and the sum I of the three values is in direct proportion to the depth of the stained specimen.
The sum of the pseudo-tristimulus values of the dyed sample is calculated according to the formula (5) in terms of I:
Figure BDA0003117144720000022
in the formula: sD65(λ) -CIE recommendation D65A standard illuminant spectral energy distribution;
Figure BDA0003117144720000023
CIE1964 standard chromaticity observer color matching functions;
Δ λ — wavelength interval.
When the color depth of the dyed sample of the sample dye is equal to that of the standard sample, the following formula (6) is satisfied:
I1＝I2 (6)
the dye relative intensity is then measured as ST and the value is expressed in minutes (or%) and calculated according to equation (7):
Figure BDA0003117144720000024
in the formula: c1-the dye concentration of the standard sample;
C2-the staining concentration of the sample.
If the sum of the pseudo-tristimulus values of the sample and the standard sample is not equal, I1≠I2Then, it is necessary to iteratively calculate by approximation, using the theoretically changing dyeing density of the sampleAnd (3) finally enabling the sum of the pseudo-tristimulus values of the sample to meet the equation (6), and then solving the relative strength of the dye sample by using the equation (7).
The essence of the national standard method II is as follows: the sum of the pseudo-tristimulus values (the weighted sum of K/S) of the sample and the standard is first equalized by adjusting the concentration of the sample by means of an iterative algorithm, and then the ratio of the staining concentration of the standard to the sample is calculated, expressed in minutes (or%).
Similar to the chinese standard, initially, when calculating the relative dye intensity abroad, the sample and the standard sample are adjusted to the same color depth, and then the relative dye intensity is obtained by calculating the ratio of the dye usage of the sample and the standard sample, as shown in formula (7). Werner Baumann et al consider that there is some difficulty in adjusting the sample and the standard to the same depth, and therefore they recommend calculating the relative intensity of the dye by means of K/S of the Kubelka-Munk equation (see equation (3)) as the intensity value of the color (color strength h value, similar color depth). However, since the conflict with the visual judgment occurs at both ends of the spectrum region when the K/S calculation is directly used, they recommend using K/S weighted by the tristimulus value of the spectrum of the standard colorimetric observer as the color intensity value, and propose formula (8) in which the dye intensity can be obtained by calculating the color intensity value per unit concentration of the sample and the standard sample as shown in formula (9), but this formula is only established when the color intensity value is in a linear relationship with the dye concentration.
Figure BDA0003117144720000031
In the formula: fk-color strength value (color strength h value);
Figure BDA0003117144720000032
CIE 1964-XYZ standard chromaticity observer spectral tristimulus values.
Figure BDA0003117144720000033
In the formula: FS-relative dye intensity;
C1，C2-the concentration of the standard and sample;
fk1，fk2color intensity values of the standard and the sample.
Later, the U.S. AATCC EP-62008 Instrument Standard recommended 4 methods to calculate Color intensity values, namely: SWL, SUM, WSUM, and TSVSTR. The first three can be calculated by reflectance or transmittance, and equations (10) to (12) show the calculation by reflectance, and the calculation method of transmittance is similar. TSVSTR directly characterizes the color intensity value in terms of the Y value of the tristimulus value (X, Y, Z), a method that is only used roughly in some textile mills and is not suitable for scientific research.
(1) The SWL method: the color intensity value, i.e., the K/S value, was calculated from the reflectance of a single wavelength at the maximum absorption peak.
SWL＝(1-Rλ(∞))2/(2Rλ(∞)) (10)
In the formula: rλ(∞)-the wavelength at which the reflectance of the sample to be measured absorbs maximally.
(2) SUM method: and calculating according to the sum of K/S values of all wavelengths in the visible spectrum, and performing normalization processing by dividing the sum by the number of the summed intervals.
SUM＝∑λ(K/S)/n (11)
In the formula: n-the number of intervals of summation.
(3) The WSUM method comprises the following steps: the normalization process is performed by calculating the sum of K/S values weighted by the standard colorimetric observer spectral tristimulus value and the standard illuminant relative spectral energy distribution, and dividing by the number of intervals of the sum.
Figure BDA0003117144720000041
In the formula:
Figure BDA0003117144720000042
-standard colorimetric observer spectral tristimulus values;
Eλ-relative spectral power distribution of a standard illuminant.
Compared with the dye intensity calculation method of GB/T6688-. However, the SWL (K/S) method is only applicable to colors having the same hue and the same change rule of the reflectance curve, and is not applicable to samples having different peak positions, such as mixed/matched colors, metamerism, and no peak in the reflectance curve. The calculation process for SUM and WSUM (similar to the color depth characterization formula Integ) is somewhat complex, and WSUM requires knowledge of the spectral tristimulus values of a standard colorimetric observer and the spectral power distribution of a standard illuminant. In practical application, the four methods have different and even contradictory results. Therefore, regarding the evaluation of dye intensity, a universal, uniform and accepted method is still lacked internationally at present, and a great promotion space also exists.
Disclosure of Invention
The invention provides a color depth formula Yangn (n is 1, 2 or 3) based on a color depth characterization method for vision equal depth based on a tristimulus value obtained in an earlier stage, provides a novel dye intensity calculation and evaluation method based on the Yangn formula, and has the advantages of simplicity and convenience, wide applicability, more accurate calculation result and the like compared with national standards and American standards.
The design concept of the invention is as follows:
s1, designing theoretically from the basic concept of dye intensity and the basic theory of color science; according to a color depth formula Yangn (n is 1, 2 or 3) provided by the invention patent of 'a characterization method of visual equal-depth color depth based on tristimulus values', the applicability of the Yangn to the evaluation of dye intensity is theoretically and experimentally researched;
s2, the objective evaluation formula of dye intensity has universality, the requirements of the relative intensity table and evaluation of all dyes are met as far as possible, and the evaluation formula is not limited by the existence, the quantity, the hue, the type and the like of dye absorption peaks;
s3, the objective evaluation result of the dye strength is required to have stability, and the stability can be kept within the concentration range of the dye which is usually used, or the stability is small along with the change of the dye concentration;
and S4, the dye intensity objective evaluation formula is consistent with a conventional principle, easy to understand and convenient to calculate.
The invention adopts the following technical scheme:
the method for evaluating the dye intensity based on the color depth formula comprises the following steps:
(1) starting from the concept of dye intensity, a calculation formula of dye intensity is designed based on a color science basic theory and an invention patent of 'visual equal-depth color depth characterization method based on tristimulus values', and the color depth of a color depth formula Yangn (n is 1, 2 or 3) is used as a color intensity value (color strength value).
(2) N of the Yangn formula has three values (1, 2 or 3), and the value of n most suitable for dye intensity is determined based on theoretical analysis and experimental inspection, and a calculation formula of the color intensity value is determined.
(3) Color samples of the test sample and the standard sample were prepared in parallel: setting the required dyeing concentration, and dyeing under standard conditions to obtain a dyed sample. The common or specific concentration dyeing sample can be selected according to the actual requirement; or set a series of concentration stains to obtain a more comprehensive result.
(4) Measuring and calculating color intensity values of the sample and the standard sample: measuring the spectral reflectivity rho (lambda) of the color sample by using a spectrophotometer or a spectrophotometer, and calculating the XYZ tristimulus values of the color sample based on the spectral reflectivity rho (lambda) or directly reading the XYZ tristimulus values from the spectrophotometer; and (3) substituting the XYZ tristimulus values of the color samples into the color depth formula in the step (2) to obtain the color depths Yangn of the sample and the standard sample, namely the color intensity values.
(5) Calculating the dye intensity: and (3) calculating the dye intensity according to the color intensity value Yangn measured in the step (4) and the dye intensity calculation formula in the steps (1) and (2) by taking one dye as a standard and the other dye as a sample.
In the step (1), a dye intensity calculation formula is designed by taking the concepts of SWL, SUM and WSUM color intensity values and dyeing concentration into account by using a dye intensity calculation formula recommended by AATCC EP-62008. In AATCC EP-62008, the SWL method actually adopts the K/S color depth value of Kubelka-Munk theory as a color intensity value; the SUM method adopts the mathematical average value of K/S; the WSUM method uses a weighted average of K/S, similar to the Integ color depth. The invention adopts the color depth formula Yangn (n is 1, 2 or 3), in contrast, Yangn (n is 1, 2 or 3) is not only simple in calculation process, but also not limited in use range. Therefore, the color intensity value can be represented by the color depth value of the Yangn formula and applied to the calculation of the dye intensity.
In the step (2), n of the Yangn formula has three values (1, 2 or 3). When n is 1, the different color depths are numerically the largest in distinction degree and the smallest in irregularity; when n is 3, the vision depth is best, and the linearity with the color with equal depth is best; when n is 2, the effect lies between the two. The Yangn 3 has the best calculation effect by comprehensively considering the relative intensities of the same dye applied to different production batches, the calculation effects of the relative dye intensities of the same dye under different concentrations and the performance characteristics of the Yangn formula. Meanwhile, Yang1 and Yang2 have better effects than the SWL, SUM and WSUM methods.
The calculation formulas for the color intensity value and the dye intensity are designed as follows.
Figure BDA0003117144720000051
Figure BDA0003117144720000052
Figure BDA0003117144720000061
Figure BDA0003117144720000062
Figure BDA0003117144720000063
In the formula: CSV-Color intensity Value (Color Strength Value);
CD-Color Depth value (Color Depth);
YCD-Color Depth value calculated by Yangn formula (Yang Color Depth);
x, Y, Z-tristimulus value of the colorant;
X0，Y0，Z0-tristimulus values of pure white/standard white;
RCS-Relative dye intensity (Relative Strength of dye);
CDsp，CDstd-the colour depth of the sample and the standard;
YCDsp，YCDstd-color intensity values of the sample and the standard;
Csp，Cstdconcentrations of sample and standard.
Wherein the tristimulus values of pure white are selected as D65The illuminant and the field of view of 10 degrees are taken as examples, and according to the Standard of ASTM E308-08 Standard Practice for calculating the Color of Objects by Using the CIE System, the data of the tri-stimulus value of the spectrum of the equivalent energy white light can be directly selected, namely: x0＝94.811，Y0＝100，Z0When formula (13) is substituted with formula (107.304), formula (15) can be obtained, that is, D65And (3) evaluating the dye intensity under the conditions of an illuminator and a 10-degree visual field, and calculating according to a formula (15). The calculation of pure white tristimulus values under other lighting and viewing conditions can be referred to this method.
Figure BDA0003117144720000064
Figure BDA0003117144720000065
Figure BDA0003117144720000066
Figure BDA0003117144720000071
And (3) selecting a corresponding dyeing process to dye a color sample according to the type of the dye. The color sample with one density can be dyed, and a plurality of densities can be dyed according to the color gradation.
GB/T6688-2008 is to dye the tested dye to 1/3 standard depth, and then calculate the ratio of the dye used by the sample and the standard sample; there have also been studies showing that the reflectance values of the dyed samples of AATCC are more satisfactory between 10% and 25%. According to the invention, if the relative dye intensities of the two dyes are compared, the dye concentration and the color depth are not limited, the color sample dyed by one dye is set as a sample, and the color sample dyed by the other dye is set as a standard sample, and a pair of color samples can be adopted, or the average value can be obtained by adopting color level color samples.
In addition, the present study found that the relative color intensity values calculated by the dye intensity calculation formulas SWL, SUM and WSUM of AATCC EP-62008 vary with the range over which the measured dye concentration values are taken. The dye intensity calculation formula provided by the invention has the advantages that the calculated relative dye intensities are almost consistent and have little change under the conditions of different concentrations. Therefore, the dyeing agent is not limited by the concentration range when in use, and the appropriate dyeing concentration can be selected according to actual requirements.
In the step (4), the color intensity value of the color sample of the dye is measured, and the spectral reflectance ρ (λ) of the color sample is measured by using a spectrophotometer or a spectrophotometer, and the XYZ tristimulus value of the color sample is calculated based on the spectral reflectance ρ (λ), or the XYZ tristimulus value is directly read from the colorimeter; and (3) substituting the XYZ tristimulus values of the color samples into the color depth formula in the step (2) to obtain the color depths Yangn of the sample and the standard sample, namely the color intensity values.
In the step (5), the relative intensity of the dye is calculated: and (3) calculating the relative intensity of the dye by using one dye as a standard and the other dye as a sample according to the color depth Yangn measured in the step (4) and the intensity calculation formula of the dye in the steps (1) and (2).
The method is also suitable for the tinting strength of the pigment, and in the steps, the dye is modified into the pigment, and the color sample preparation method is modified into the coating and printing process.
The method can adopt programming languages such as Matlab and the like to carry out batch processing of data, and is simple, convenient and fast.
The invention has the following beneficial effects:
1. the dye strength evaluation method designed by the invention is an objective method, can be used for measuring tristimulus values by an instrument and calculating, can also be used for embedding a calculation program into the instrument, directly gives a measurement result by the instrument, does not need subjective evaluation, and is not influenced by factors such as psychology, physiology, age, preference and the like of a tester.
2. The invention has good universality and wide application range. The dye strength calculation formula is suitable for all dyes, is not limited by conditions such as the reflectivity and hue of the detected dye, can be used for splicing and mixing dyes and different dyes under the conditions of no peak, multiple peaks and the like of a reflectivity curve.
3. The method is simple and convenient to operate and simple in calculation. When preparing the color sample, the sample and the standard sample do not need to be adjusted to a certain standard depth, the sample and the standard sample do not need to be adjusted to the same color depth, and only concentration dyeing is selected according to actual application to prepare the color sample. When calculating the dye intensity: the dye intensity can be obtained by simply calculating the XYZ tristimulus values of the color sample by substituting the XYZ tristimulus values into the calculation formula (13) and the calculation formula (14) in the patent of the invention.
4. The dye intensity formula designed by the invention has the advantages of high calculation result precision, small fluctuation along with dyeing concentration and low irregularity. According to the invention, a series of concentration of a plurality of pairs of dyes with the same type and different production batches, different types of three primary colors (R, Y, B) and 3 specifications (E, SE and S) are adopted to measure and calculate the relative dyeing intensity, and the result shows that the relative color intensity RCS disclosed by the invention is extremely little influenced by the value of the dye concentration. As shown in tables 1 to 3, the CV values of the dye intensities calculated according to the present invention RCS (three columns of Yang1, Yang2 and Yang 3) are smaller than those of SWL, SUM and WSUM under a series of concentrations for different production batches of dyes of the same type and different types of dyes, which indicates that the dye intensities have small concentration-dependent variation, and particularly for different types of medium-dark dyes, the advantages are more obvious, as shown in table 3, the CV value of the conventional method is about 10%, and the CV value of the method of the present invention is below 2%. Therefore, when the dye is used, dyeing can be carried out in a required concentration range according to the actual conditions of the dye, the relative intensity of the dye can be measured, and as shown in tables 1 to 3, concentration step change color gradation samples can be adopted in the concentration use range to obtain an average value, and the average value is used for representing the intensity of the dye.
TABLE 1 dye Strength of dyes (RE) of the same type in different production batches at concentrations of the series
Figure BDA0003117144720000081
TABLE 2 dye Strength of different production batches of the same type of dyes (RSE) in the concentration series
Figure BDA0003117144720000091
TABLE 3 dye Strength of different classes of dyes (YS1 and YS2) at a series of concentrations
Figure BDA0003117144720000092
(5) The invention is not limited to colorants for dyeing and printing textiles, and colorants (inks, paints, etc.) for coloring other substrates, such as paper, may also be used.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
Example 1
Based on the dye intensity evaluation method of the color depth characterization formula Yangn (n is 1, 2 or 3), taking the Yang1 formula to calculate the medium-deep red disperse dye RSE produced by different batches of the same type as an example, the method comprises the following steps:
a. and (3) taking the first purchased disperse red dye RSE1 as a standard sample and the second purchased disperse red dye RSE2 as a sample, setting the dyeing concentration to be 0.45, and dyeing the plain weave polyester fabric at high temperature and high pressure under the same condition to obtain dyeing samples of the sample and the standard sample.
b. Spectral reflectance ρ (λ) of the test color sample: the spectral reflectance ρ (λ) of a color sample (e.g., dyed fabric) is measured using a spectrophotometer with an integrating sphere or a spectrophotometer. If a standard spectrocolorimeter is provided, the step can be omitted, and the tristimulus values XYZ of the color sample can be directly read by color measurement.
c. Calculating tristimulus values XYZ of the colour sample: and calculating the XYZ tristimulus values of the color sample according to the measured spectral reflectivity rho (lambda), or directly reading the XYZ tristimulus values of the color sample from a spectral colorimeter. Obtaining a color sample RSE1 and a color sample RSE2 at D by using an X-Rite spectrocolorimeter for testing65Tristimulus values for the illuminant and 10 ° viewing angle are: x1＝51.667，Y1＝36.347，Z1＝33.465；X2＝50.227，Y2＝35.264，Z2＝32.369。
d. Calculating the color intensity value (color depth) YCD of the color sample: substituting the tristimulus values XYZ of the color samples into the formula (15-1), the dye intensities YCD of the color sample RSE1 and the color sample RSE2 were calculatedstdAnd YCDsp。
Figure BDA0003117144720000101
Figure BDA0003117144720000102
e. Calculating the relative dye intensities RCS of the color sample RSE1 and the color sample RSE2, and comparing the YCDstd、YCDsplAnd the concentration of 0.45 into equation (14), and if there is a deviation of the actual dyeing concentration from the design concentration of 0.45, the actual dyeing concentration is substituted into equation (14) to obtain a more accurate result.
Figure BDA0003117144720000111
According to the calculation result, the RCS is 101.97% > 100%: the dye intensity of the disperse red dye RSE2 is higher than that of the disperse red dye RSE1, namely, the dye intensity of the disperse red dye RSE purchased for the second time is slightly higher than that of the disperse red dye RSE purchased for the first time.
Example 2
Taking the Yang2 formula as an example for evaluating the light yellow dye YE produced by different batches of the same type, the steps are as follows:
a. and (3) taking the light yellow dye YE1 purchased for the first time as a standard sample and the light yellow dye YE2 purchased for the second time as a sample, setting the dyeing concentration to be 0.11, and dyeing the plain weave polyester fabric at high temperature and high pressure under the same condition to obtain dyeing samples of the sample and the standard sample.
b. The tristimulus values XYZ of the colour samples were tested and extracted: obtaining a color sample YE1 and a color sample YE2 at D by using an X-Rite spectrocolorimeter for testing65Tristimulus values for the illuminant and 10 ° viewing angle are: x1＝72.811，Y1＝80.620，Z1＝29.892；X2＝73.911，Y2＝82.212，Z2＝30.953。
c. Calculating the color intensity value YCD of the color sample: the tristimulus values XYZ of the color samples were substituted into the formula (15-2), and the dye intensities YCD of the color sample YE1 and the color sample YE2 were calculatedstdAnd YCDsp。
Figure BDA0003117144720000112
Figure BDA0003117144720000113
d. For calculating colour samples YE1 and YE2Relative to dye intensity RCS, YCDstd、YCDsplAnd the concentration of 0.11 into formula (14), and if there is a deviation of the actual dyeing concentration from the design concentration of 0.11, the actual dyeing concentration is substituted into formula (14) to obtain a more accurate result.
Figure BDA0003117144720000114
From the calculation result RCS 96.49% < 100%, it was found that: the light yellow dye YE1 has a higher dye intensity than the light yellow dye YE2, i.e., the light yellow dye YE is purchased a second time with a lower dye intensity than the first purchase.
Example 3
Taking the Yang3 formula to evaluate different types of medium-deep blue dye BSE as an example, the method comprises the following steps:
a. the method comprises the steps of taking a Navy HLX-DN series medium-deep blue dye BSE1 as a standard sample, taking a Neotron Navy GL 200% series medium-deep blue dye BSE2 as a sample, setting the dyeing concentration to be 2.0, and dyeing the plain weave polyester fabric at high temperature and high pressure under the same condition to obtain a dyeing sample of the sample and the standard sample.
b. The tristimulus values XYZ of the colour samples were tested and extracted: using an X-Rite spectrocolorimeter to test and obtain a color sample BSE1 and a color sample BSE2 at D65Tristimulus values for the illuminant and 10 ° viewing angle are: x1＝7.562，Y1＝8.083，Z1＝15.814；X2＝8.703，Y2＝9.986，Z2＝19.780。
c. Calculating the color intensity value YCD of the color sample: substituting the tristimulus values XYZ of the color samples into the formula (15-3), the dye intensities YCD of the color sample BSE1 and the color sample BSE2 were calculatedstdAnd YCDspl。
Figure BDA0003117144720000121
Figure BDA0003117144720000122
d. Calculating the relative dye intensities RCS of color sample BSE1 and color sample BSE2, and comparing the YCDstd、YCDsplAnd the concentration 2.0 into the formula (14), and if there is a deviation of the actual dyeing concentration from the design concentration 2.0, the actual dyeing concentration is substituted into the formula (14) to obtain a more accurate result.
Figure BDA0003117144720000123
According to the calculation result RCS of 94.28% < 100%: the intensity of the dark blue dye BSE1 in the Navy HLX-DN series is higher than that of the Neoron Navy GL 200% series, and the intensity of the dark blue dye in the Navy HLX-DN series is about 1.06 times (reciprocal of 94.28%) that of the dark blue dye in the Neoron Navy GL 200% series.
Example 4
The average relative intensity of the dye is evaluated by adopting a color gradation color sample, and different types of medium-deep blue dye BSE are calculated by using a Yang3 formula as an example, the steps are as follows:
a. the first purchase of light red dye RE1 is taken as a standard sample, the second purchase of light red dye RE2 is taken as a sample, the series dyeing concentrations are set to be 0.11, 0.02, 0.04, 0.07, 0.11, 0.16, 0.22 and 0.3, and the dyeing samples of the sample and the standard sample are obtained by carrying out high-temperature high-pressure dyeing on the plain weave polyester fabric under the same conditions.
b. The tristimulus values XYZ of the colour samples were tested and extracted: using an X-Rite spectrocolorimeter to test and obtain a series of color samples RE1 and RE2 at D65Tristimulus values for the illuminant and 10 ° viewing angle, as shown in table 4.
TABLE 4 tristimulus values for the different batches of light red dyes RE1 and RE2
Figure BDA0003117144720000131
c. Calculating the color intensity value YCD and the relative dye intensity RCS of the color sample: the tristimulus values XYZ of the color samples were substituted into the formula (15-1), and the dye intensities YCD of the series of color samples RE1 and RE2 were calculatedstdAnd YCDsp(ii) a Substituting the formula (14) to calculate a series of dyesThe results of the calculation of the relative intensity RCS of (A) are shown in Table 5.
TABLE 5 color intensity values YCD and relative dye intensities RCS of the different batches of light blue dyes BE1 and BE2
Figure BDA0003117144720000132
According to the calculation results, the color intensity values of the color sample RE2 are slightly higher than those of the color sample RE1 in the 8 concentration ranges, the relative dye intensity of the light red dye purchased for the second time at each concentration is higher than that purchased for the first time, and the relative intensity of the dye purchased for the second time for the dye purchased for the first time can be represented by the average value of the series of concentrations, namely 100.70%.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (10)

1. The method for evaluating the dye intensity based on the color depth formula is characterized by comprising the following steps of:
(1) starting from the concept of dye intensity, designing a calculation formula of dye intensity based on a color science basic theory and a color depth formula, and designing a general calculation formula of dye intensity by taking the color depth of a color depth formula Yangn as a color intensity value;
(2) determining an n value suitable for dye intensity according to a color depth formula Yangn (n is 1, 2 or 3) by combining theoretical analysis and experimental inspection, and further determining a calculation formula of a color intensity value;
(3) color samples of the test sample and the standard sample were prepared in parallel: setting the concentration of the required dyeing, and dyeing under standard conditions to respectively prepare a sample and a standard sample of a dyed sample;
(4) measuring and calculating color intensity values of the sample and the standard sample: respectively measuring the spectral reflectivity rho (lambda) of the sample and the standard sample in the step (3), calculating or reading XYZ tristimulus values from a color measuring instrument, and then substituting the XYZ tristimulus values of the sample and the standard sample into the color intensity formula in the step (2) to obtain the color depth Yangn, namely the color intensity value Yangn, of the dyed sample of the sample and the standard sample;
(5) calculating the dye intensity: and (3) calculating the dye intensity according to the color intensity value Yangn measured in the step (4) and the dye intensity calculation formula in the steps (1) and (2) by taking the standard sample as a standard.
2. The method according to claim 1, wherein the dye intensity in step (1) is calculated as shown in formula (1):
Figure FDA0003117144710000011
in the formula: RCS-dye intensity (Relative Strength of dye);
CSVsp，CSVstdcolor Strength values (Color Strength Value) of the samples and standards;
CDsp，CDstd-the staining depth of the sample and the standard;
Csp，Cstdconcentration of staining of samples and standards.
3. The method of claim 2, wherein: the CD adopts a color depth value YCD of a Yangn formula, as shown in a formula (2); substituting the formula into the formula (1) to obtain a formula (3):
Figure FDA0003117144710000012
Figure FDA0003117144710000013
in the formula: YCD-Depth value calculated by Yangn formula (Yang Color Depth);
x, Y, Z-tristimulus value of the colorant;
X0，Y0，Z0-tristimulus values of pure white/standard white;
YCDsp，YCDstd-the colour depth of the sample and the standard;
Csp，Cstdconcentration of staining of samples and standards.
4. The method of claim 1, wherein: in the step (2), the value of n is determined, and the tristimulus value X of pure white/standard white in the formula is obtained0，Y0，Z0And substituting them into the formula (2) to obtain a specific calculation formula.
5. The method of claim 4, wherein: the tri-stimulus value of the pure white/standard white is selected as D65The illuminant and the field of view of 10 degrees are taken as examples, and according to the ASTM E308-08 standard, the data of the tri-stimulus value of the spectrum of the equivalent energy white light can be directly selected, namely: x0＝94.811，Y0＝100，Z0107.304; substituting the formula (2) to obtain the formulas (2-1) to (2-3), namely D65Evaluating the dye intensity under the conditions of an illuminator and a 10-degree field of view, and selecting one formula for calculation;
Figure FDA0003117144710000021
Figure FDA0003117144710000022
Figure FDA0003117144710000023
6. the method of claim 1, wherein: the standard condition in the step (3) refers to selecting a corresponding dyeing process to dye a color sample according to the type of the dye required by dyeing, wherein the color sample with one concentration can be dyed, and a plurality of concentrations can be dyed according to color levels.
7. The method of claim 1, wherein: the spectral reflectivity rho (lambda) in the step (4) is obtained by measuring a color sample based on a spectrophotometer or a spectrophotometer, and the measurement conditions are as follows: at D65Calculating tristimulus values of the color samples under the condition of an illuminating body and a 10-degree view field or under the condition of other illuminating bodies and a 2-degree view field; or directly reading the tristimulus values of the color sample from various color testers, and then substituting the XYZ tristimulus values of the color sample into the dye intensity characterization formula in the step 2) to obtain the color intensity value of the color sample.
8. The method of claim 1, wherein: in the dye intensity result data finally measured in the step (5), when RCS is greater than 100, the dye intensity of the sample is higher than that of the standard sample; RCS 100, dye intensity equal for sample and standard; RCS <100, dye intensity of the sample is lower than that of the standard.
9. The method of any one of claims 1-8, wherein: the method is also suitable for evaluating the tinting strength of pigments.
10. The method of claim 9, wherein: when the tinting strength of the pigment is evaluated, the dye is replaced by the pigment, and the dyeing method of the sample and the standard sample is replaced by a coating and printing process.
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Publication number Priority date Publication date Assignee Title
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US20160123850A1 (en) * 2014-01-17 2016-05-05 Ffei Limited Method of forming a stain assessment target
CN109282899A (en) * 2018-10-19 2019-01-29 中原工学院 The color depth characterizing method of the depth such as vision based on tristimulus values

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