阅读说明：本技术 隐形眼镜染色方法 (Method for dyeing contact lenses ) 是由 萧旭贵 陈志成 于 2020-12-29 设计创作，主要内容包括：本发明属于隐形眼镜加工技术领域,特别涉及隐形眼镜染色方法,包括对原色色粉的研磨及于标准溶剂混合获得原色色膏步骤,对原色色膏Lab色度坐标实际值的获取步骤,配色原件基于原色色膏Lab色度坐标实际值的校准步骤,配色软件以及与原色色膏Lab色度坐标校准值和用于颜色需求数值计算生成配色比例步骤,通过配色比例混合原色色膏并转印,加工获得预印镜片步骤,对预印镜片进行颜色对并根据校准差值重新校准配色比例至色差值为0或处于色差可接受范围以获得标准配色比例步骤以及根据标准配色大批量生产步骤；本发明通过对染色过程中多个时期颜色进行分析建立Lab色度坐标以获得最佳的标准配色比例,以保证出厂产品显色与客户要求颜色相匹配。(The invention belongs to the technical field of contact lens processing, and particularly relates to a contact lens dyeing method which comprises the steps of grinding primary color toner and mixing the primary color toner with a standard solvent to obtain primary color paste, obtaining an actual value of a Lab chromaticity coordinate of the primary color paste, calibrating a color matching original based on the actual value of the Lab chromaticity coordinate of the primary color paste, generating a color matching proportion by color matching software, calibrating a calibration value of the Lab chromaticity coordinate of the primary color paste and calculating a required value of a color, mixing the primary color paste with the color matching proportion and transferring the mixture, processing to obtain a preprinted lens, performing color pairing on the preprinted lens, recalibrating the color matching proportion again according to the calibration difference until the color difference is 0 or is in an acceptable range of color difference to obtain a standard color matching proportion, and performing mass production according to the standard; the optimal standard color matching proportion is obtained by analyzing colors in multiple periods in the dyeing process and establishing Lab chromaticity coordinates, so that the color development of the factory product is matched with the color required by a client.)

1. A method of staining a contact lens, comprising the steps of:

the method comprises the following steps: putting 0.1-20 wt% of various primary color powders into a planetary ball mill for grinding, and respectively adding 80-99.9 wt% of standard solvents for uniformly mixing to obtain various primary color pastes;

step two: spreading ink on the multiple primary color pastes obtained in the first step, establishing Lab chromaticity-based coordinates through a spectrometer, and obtaining Lab chromaticity coordinate actual values of the multiple primary color pastes;

step three: inputting the actual values of the chromaticity coordinates of the multiple primary color pastes Lab obtained in the second step into color matching software, and calibrating the actual values of the chromaticity coordinates of the multiple primary color pastes Lab based on the corresponding standard values of the chromaticity coordinates of the primary color pastes Lab in the color matching software to obtain calibration values of the chromaticity coordinates of the multiple primary color pastes Lab;

step four: inputting the color numerical values required by the customers into color matching software, and calculating by the color matching software based on the color numerical values required by the customers and the Lab chromaticity coordinate calibration values of the multiple primary color pastes obtained in the third step to generate a color matching proportion based on the color numerical values required by the customers;

step five: mixing a plurality of primary color pastes based on the color matching proportion obtained in the fourth step to obtain a preprinted pigment;

step six: transferring the preprinting pigment obtained in the fifth step onto a contact lens substrate to form a dyeing layer on the contact lens substrate to obtain a preprinting substrate;

step seven: coating a transparent film on the surface of the dyeing layer on the preprinting substrate obtained in the sixth step to obtain a preprinting lens;

step eight: obtaining a reference value of a Lab chromaticity coordinate of the lens by the pre-printed lens obtained in the seventh step through a spectrometer, inputting the reference value of the Lab chromaticity coordinate of the lens into color matching software, and comparing the reference value of the Lab chromaticity coordinate of the lens based on a standard value of the Lab chromaticity coordinate of the lens corresponding to the color matching software to obtain a calibration difference value;

step nine: the color matching software recalculates the color matching ratio based on the calibration difference value obtained in the step eight to obtain the calibrated color matching ratio, and the step five to the step eight are repeated until the reference value of the Lab chromaticity coordinate of the lens is the same as the standard value of the Lab chromaticity coordinate of the lens corresponding to the color matching software to obtain the standard color matching ratio;

step ten: and (4) carrying out batch contact lens dyeing based on the standard color matching proportion obtained in the step nine.

2. The method for staining contact lenses according to claim 1, wherein in step two, the spreading is performed by a color spreader.

3. The method for staining a contact lens according to claim 2, wherein the ink spreading parameters of the color spreader are: the printing speed is 0.3m/s, the anilox roller pressure is 300N, the anilox roller rotating speed is 50 percent, and the printing pressure is 100N.

4. The method for dyeing a contact lens according to claim 1, wherein in the second step, the spectrometer is an aley CI7600 color difference analyzer.

5. The method for dyeing a contact lens according to claim 4, wherein the number of sampling times of the spectrometer is 3-6, and the actual value of the Lab chromaticity coordinate of the plurality of primary color pastes is obtained by averaging the sampled values of the Lab chromaticity coordinate of the plurality of primary color pastes obtained by 3-6 sampling times.

6. The method for staining a contact lens according to any one of claims 1, 4 or 5, wherein the plurality of primary color pastes Lab color coordinates have actual color difference values of < 0.4.

7. The method for dyeing a contact lens according to claim 1, wherein in step three, the Color matching software is Color iControl.

8. The method for staining a contact lens according to claim 1, wherein in the sixth step, the thickness of the stained layer is 3 to 20 μm.

Technical Field

The invention belongs to the technical field of contact lens processing, and particularly relates to a contact lens dyeing method.

Background

In the prior art, a dyeing method for coloring a contact lens is mainly obtained by transferring a dye on a contact lens substrate to the surface of the contact lens substrate, the color of the dye is mainly matched based on the requirements of a customer, and then the color of the dye after being matched is judged according to the eye color discrimination and experience of quality testing personnel, so that certain error exists in the color judgment of the dye due to the particularity of human eyes, and meanwhile, the color displayed by the dye after being transfected on the contact lens substrate is different from the dye to a certain extent, which causes the condition that the color requirements of a final product leaving a factory are inconsistent with the color requirements of the customer.

Meanwhile, for the preparation of the dye, a plurality of primary color toners are mainly blended into a plurality of primary color pastes and then mixed, the primary color toners are easy to agglomerate in the storage process, and the primary color toners are traditionally ground by a three-roller grinding machine, but the ground primary color toners are still uneven due to certain viscosity, and the color accuracy is easily influenced when a solvent is added subsequently and mixed with each other; moreover, the primary color toner has a certain color difference from a standard value due to oxidation or other factors during long-term storage, which exacerbates the empirical requirement of subsequent proportioning.

Disclosure of Invention

In order to overcome the defects of the prior art, the technical problems to be solved by the invention are as follows: an optimized contact lens tinting method based on customer requirements is provided.

In order to solve the technical problems, the invention adopts the technical scheme that: a method of staining a contact lens, comprising the steps of:

the method comprises the following steps: putting 0.1-20 wt% of various primary color powders into a planetary ball mill for grinding, and respectively adding 80-99.9% of standard solvents for uniformly mixing to obtain various primary color pastes;

step two: spreading ink on the multiple primary color pastes obtained in the first step, establishing Lab chromaticity-based coordinates through a spectrometer, and obtaining Lab chromaticity coordinate actual values of the multiple primary color pastes;

step three: inputting the actual values of the chromaticity coordinates of the multiple primary color pastes Lab obtained in the second step into color matching software, and calibrating the actual values of the chromaticity coordinates of the multiple primary color pastes Lab based on the corresponding standard values of the chromaticity coordinates of the primary color pastes Lab in the color matching software to obtain calibration values of the chromaticity coordinates of the multiple primary color pastes Lab;

step four: inputting the color numerical values required by the customers into color matching software, and calculating by the color matching software based on the color numerical values required by the customers and the Lab chromaticity coordinate calibration values of the multiple primary color pastes obtained in the third step to generate a color matching proportion based on the color numerical values required by the customers;

step five: mixing a plurality of primary color pastes based on the color matching proportion obtained in the fourth step to obtain a preprinted pigment;

step six: transferring the preprinting pigment obtained in the fifth step onto a contact lens substrate to form a dyeing layer on the contact lens substrate to obtain a preprinting substrate;

step seven: coating a transparent film on the surface of the dyeing layer on the preprinting substrate obtained in the sixth step to obtain a preprinting lens;

step eight: obtaining a reference value of a Lab chromaticity coordinate of the lens by the pre-printed lens obtained in the seventh step through a spectrometer, inputting the reference value of the Lab chromaticity coordinate of the lens into color matching software, and comparing the reference value of the Lab chromaticity coordinate of the lens based on a standard value of the Lab chromaticity coordinate of the lens corresponding to the color matching software to obtain a calibration difference value;

step nine: the color matching software recalculates the color matching ratio based on the calibration difference value obtained in the step eight to obtain the calibrated color matching ratio, and the step five to the step eight are repeated until the reference value of the Lab chromaticity coordinate of the lens is the same as the standard value of the Lab chromaticity coordinate of the lens corresponding to the color matching software to obtain the standard color matching ratio;

step ten: and (4) carrying out batch contact lens dyeing based on the standard color matching proportion obtained in the step nine.

And in the second step, the ink spreading is carried out by a color spreading instrument.

Wherein, the exhibition black parameter of exhibition look appearance is: the printing speed is 0.3m/s, the anilox roller pressure is 300N, the anilox roller rotating speed is 50 percent, and the printing pressure is 100N.

And in the second step, the spectrometer is an allochroic CI7600 color difference analyzer.

The sampling times of the spectrometer are 3-6 times, and the actual values of the Lab chromaticity coordinates of the multiple primary color pastes are obtained by averaging the sampling values of the Lab chromaticity coordinates of the multiple primary color pastes obtained by sampling for 3-6 times.

Wherein, the color difference value of the Lab chromaticity coordinate actual value of the plurality of primary color pastes is less than 0.4.

In the third step, the Color matching software is Color iControl.

Wherein, in the sixth step, the thickness of the dyeing layer is 3-20 μm.

The invention has the beneficial effects that:

1. by adopting the planetary ball mill to grind the primary color toner, the granularity and the color difference value of the ground primary color toner are effectively reduced, the uniformity of the ground primary color toner is improved, and the accuracy of subsequent color matching is effectively improved.

2. The primary color paste is spread with ink before being subjected to color sampling, so that the accuracy of color sampling of the spectrometer is improved.

3. The optimal color matching proportion is obtained by collecting the plurality of Lab chromaticity coordinate values and the calibration difference values in the color matching software and calculating, so that the influence on the color display of a final product caused by the chromatic aberration of the primary color toner, the chromatic aberration of the color distinguished by human eyes, the color aberration of the transferred color and the like in the traditional process is effectively avoided, the color matching time is effectively shortened, and the production efficiency is also effectively improved.

Detailed Description

In order to explain the technical content, the objects and the effects of the present invention in detail, the following description will be given with reference to the embodiments.

The most key concept of the invention is as follows: the optimal color matching proportion is obtained by collecting a plurality of Lab chromaticity coordinate values and calibration difference values in color matching software and calculating, so that the problem of poor color accuracy of final factory products caused by a plurality of error factors in the traditional process is effectively avoided.

The first embodiment is as follows:

a method of staining a contact lens, comprising the steps of:

the method comprises the following steps: putting 0.1-20 wt% of various primary color powders into a planetary ball mill for grinding, and respectively adding 80-99.9 wt% of standard solvents for uniformly mixing to obtain various primary color pastes;

step two: spreading ink on the multiple primary color pastes obtained in the first step, establishing Lab chromaticity-based coordinates through a spectrometer, and obtaining Lab chromaticity coordinate actual values of the multiple primary color pastes;

step three: inputting the actual values of the chromaticity coordinates of the multiple primary color pastes Lab obtained in the second step into color matching software, and calibrating the actual values of the chromaticity coordinates of the multiple primary color pastes Lab based on the corresponding standard values of the chromaticity coordinates of the primary color pastes Lab in the color matching software to obtain calibration values of the chromaticity coordinates of the multiple primary color pastes Lab;

step four: inputting the color numerical values required by the customers into color matching software, and calculating by the color matching software based on the color numerical values required by the customers and the Lab chromaticity coordinate calibration values of the multiple primary color pastes obtained in the third step to generate a color matching proportion based on the color numerical values required by the customers;

step five: mixing a plurality of primary color pastes based on the color matching proportion obtained in the fourth step to obtain a preprinted pigment;

step six: transferring the preprinting pigment obtained in the fifth step onto a contact lens substrate to form a dyeing layer on the contact lens substrate to obtain a preprinting substrate;

step seven: coating a transparent film on the surface of the dyeing layer on the preprinting substrate obtained in the sixth step to obtain a preprinting lens;

step eight: obtaining a reference value of a Lab chromaticity coordinate of the lens by the pre-printed lens obtained in the seventh step through a spectrometer, inputting the reference value of the Lab chromaticity coordinate of the lens into color matching software, and comparing the reference value of the Lab chromaticity coordinate of the lens based on a standard value of the Lab chromaticity coordinate of the lens corresponding to the color matching software to obtain a calibration difference value;

step nine: the color matching software recalculates the color matching ratio based on the calibration difference value obtained in the step eight to obtain the calibrated color matching ratio, and the step five to the step eight are repeated until the reference value of the Lab chromaticity coordinate of the lens is the same as the standard value of the Lab chromaticity coordinate of the lens corresponding to the color matching software to obtain the standard color matching ratio;

step ten: and (4) carrying out batch contact lens dyeing based on the standard color matching proportion obtained in the step nine.

Example two:

the method comprises the following steps: firstly, an operator respectively puts 0.1-20 wt% of a plurality of primary color powders into a grinding bottle in a planetary ball mill, grinds the primary color powders, takes out the primary color powders, respectively adds 80-99.9% of acrylic resin solution (acrylic copolymer) and uniformly mixes to obtain a plurality of primary color pastes with the color difference value less than 0.4;

step two: an operator carries out ink spreading on 0.1-20 wt% of various primary color pastes respectively through a color spreading instrument, the ink spreading parameters of the specific color spreading instrument are printing speed of 0.3m/s, anilox roller pressure of 300N, anilox roller rotating speed of 50% and printing pressure of 100N, the ink spread primary color pastes are respectively placed into an Aiallowayan CI7600 color difference analyzer for color sampling, the sampling times are 3-6 times, corresponding primary color paste Lab chromaticity coordinate sampling values are respectively generated, and the average value of the obtained 3-6 primary color paste Lab chromaticity coordinate sampling values is obtained to obtain respective Lab chromaticity coordinate actual values of each primary color paste;

step three: introducing the actual values of the chromaticity coordinates of the Lab of the multiple primary colors into color matching software through data transmission, and carrying out calibration fitting on the actual values of the chromaticity coordinates of the Lab of the multiple primary colors by the color matching software through the corresponding standard values of the chromaticity coordinates of the Lab of the multiple primary colors in a pre-installed database to generate calibration values of the chromaticity coordinates of the Lab of the multiple primary colors;

step four: inputting color numerical values required by a client into color matching software according to the requirement of the client, and calculating by the color matching software based on the color numerical values required by the client and the Lab chromaticity coordinate calibration values of the multiple primary color pastes to obtain the ratio;

step five: mixing the multiple primary color pastes according to the obtained proportion by an operator to obtain a preprinted pigment;

step six: transferring the obtained preprinting dye onto a contact lens substrate through a conventional transfer printing process to form a preprinting substrate with a dye layer transferred;

step seven: coating a transparent film on the dyeing layer by a conventional process method to obtain a preprinted lens;

step eight: an operator places the preprinted lenses in the above Elavity CI7600 color difference analyzer to obtain the reference value of Lab chromaticity coordinate of the lenses, and compares the reference value with the standard value of Lab chromaticity coordinate of the lenses in a database preinstalled in color matching software to generate a calibration difference value;

step nine: when the calibration difference between the two shows that the two have no color difference or are within an acceptable color difference range, obtaining a standard color matching ratio;

step ten: the operator dyes a large number of contact lens according to standard color matching proportions.

Example three:

the first step to the eighth step are the same as the corresponding steps in the embodiment;

step nine: when the calibration difference value produced based on the standard value of the chromaticity coordinate of the lens Lab and the reference value of the chromaticity coordinate of the lens Lab shows that the chromatic aberration exists between the standard value of the chromaticity coordinate of the lens Lab and the reference value of the chromaticity coordinate of the lens Lab and exceeds the acceptable chromatic aberration range, inputting the calibration difference value into color matching software through data transmission and calculating to generate a calibrated color matching proportion, and repeating the steps of transferring, coating and checking the color until the calibration difference value shows that the chromatic aberration does not exist between the standard value of the chromaticity coordinate of the lens Lab and the reference value of the chromaticity;

step ten: and carrying out mass influence research on lens dyeing by an operator according to the standard color matching proportion.

Verification example 1:

three-drum grinding and planetary grinding were performed respectively using primary Color toners of the same quality and the same Color, and particle size comparison was performed by a particle size measuring grinder (also called a fineness-meter, manufactured by BYK-Gardner, germany) and Color difference comparison with a standard Color was performed by a spectroscope (alice CI7600 Color difference analyzer) Color collecting and matching software (Color iControl), respectively, and the comparison results are shown in table 1:

TABLE 1

	Planetary grinding	Three-roller grinding
			1. Number of colors that can be polished at one time	1-25	1
2. Particle size	2-7μm	2-22μm
			3. Color difference value	0	0.17

As can be seen from the data analysis in table 1, the particle size uniformity of the primary color toner is better than that of the three-roller grinding method in the planetary grinding method, and the color difference value of the ground primary color toner compared with the standard color is better than that of the primary color toner.

Further, the effects of the difference in the color difference values between the planetary grinding and the three-roller grinding on the Lab chromaticity coordinates were analyzed, and the analysis results are shown in table 2:

TABLE 2

According to the data analysis in table 2, the color difference value of the primary color toner is 0.00 by the planetary grinding method, which is closer to the color chroma of the primary color toner, and meanwhile, the Lab chromaticity coordinate is stable, thereby effectively reducing the error value of the subsequent color matching software for calculating the color matching proportion.

Verification example 2:

according to the standard colors required by customers, 4 standard color matching ratios are generated by the methods in the embodiment 2 and the embodiment 3, and corresponding 4 pairs of contact lenses are prepared according to the 4 standard color matching ratios, one contact lens is arbitrarily selected as a standard value to be compared with other contact lenses in color, and the comparison result is shown in table 3:

TABLE 3

Wherein, L is lightness data, DL is lightness difference, a is red-green deviation data, Da is red-green difference, b is yellow-blue deviation data, Db is yellow-blue difference, C is saturation data, DC is saturation difference, h is hue data, DH is hue difference, DEcmc is total color difference, and P/F DE cmc is total tolerance.

As can be seen from the data analysis in table 3, the standard color matching ratios generated by examples 2 and 3 and the colors on the contact lenses generated by the standard color matching ratios are within the acceptable range according to the standard colors of the customers, so that the contact lenses have the advantage of standardized production.

In conclusion, the planetary ball mill is adopted to grind the primary color powder, so that the granularity and the color difference value of the ground primary color powder are effectively reduced, the uniformity of the ground primary color powder is improved, and the accuracy of subsequent color matching is effectively improved; before the primary color paste is subjected to color sampling, ink spreading is firstly carried out on the primary color paste so as to improve the accuracy of color sampling of the spectrometer; the optimal color matching proportion is obtained by collecting the plurality of Lab chromaticity coordinate values and the calibration difference values in the color matching software and calculating, so that the influence on the color display of a final product caused by the chromatic aberration of the primary color toner, the chromatic aberration of the color distinguished by human eyes, the color aberration of the transferred color and the like in the traditional process is effectively avoided, the color matching time is effectively shortened, and the production efficiency is also effectively improved.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent modifications made by the present invention in the specification or directly or indirectly applied to the related technical field are included in the scope of the present invention.