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Basic data
| Standard ID | SN/T 5241-2020 (SN/T5241-2020) |
| Description (Translated English) | (Import and export textiles automatic evaluation method of color fastness grade) |
| Sector / Industry | Commodity Inspection Standard (Recommended) |
| Classification of Chinese Standard | W04 |
| Classification of International Standard | 59.080.01 |
| Word Count Estimation | 11,146 |
| Date of Issue | 2020-08-27 |
| Date of Implementation | 2021-03-01 |
| Regulation (derived from) | General Administration of Customs Announcement No. 98 [2020] |
| Issuing agency(ies) | General Administration of Customs |
SN/T 5241-2020: (Import and export textiles automatic evaluation method of color fastness grade)
---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Import and export textiles-Method of automatic instrumental grading of
colour fastness
The People's Republic of China Entry-Exit Inspection and Quarantine Industry Standards
2020-08-27 release
2021-03-01 implementation
Issued by the General Administration of Customs of the People's Republic of China
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard was proposed and managed by the General Administration of Customs of the People's Republic of China.
Drafting organization of this standard. Shijiazhuang Customs, People's Republic of China.
The main drafters of this standard. Liu Jinrui, Zhang Xiangli, Gao Youjun, Yuan Yuanyuan, Zhao Sumin, Chen Baoxi, Sun Lixia, Wang Wenli.
Automatic evaluation method for color fastness grade of import and export textiles
1 Scope
This standard specifies the automatic assessment method of various fabrics for staining and discoloration grades.
This standard applies to the color fastness of textiles with uniform staining and discoloration and a pattern diameter of not less than 10 mm or greater than the aperture of the observation hole of the instrument
assessment.
Note. For the color fastness, due to the influence of fluorescence and/or other factors, there may be a difference between the instrument rating and the visual rating of the sample.
2 Normative references
The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this article
Pieces. For undated reference documents, the latest version (including all amendments) is applicable to this document.
GB/T 250 Textiles Color fastness test Gray scale for evaluating color change
GB/T 251 Textiles Color fastness test Gray scale for evaluating staining
GB/T 6151 Textiles-Test general rules for color fastness test
GB/T 7568.1 Textiles Color fastness test Wool standard lining fabric specifications
GB/T 7568.2-2008 Textiles. Test for color fastness. Standard lining fabrics. Part 2.Cotton and viscose fibers
GB/T 7568.3 Textiles Color fastness test Standard lining fabric Part 3.Polyamide fiber
GB/T 7568.4 Textiles Color fastness test Specification of polyester standard lining fabric
GB/T 7568.5 Textiles Color fastness test Specification of polyacrylonitrile standard lining fabric
GB/T 7568.6 Textiles Color fastness test Specification of silk standard lining fabric
GB/T 7568.7 Textiles Color fastness test Standard lining fabrics Part 7.Divided into multi-fiber
GB/T 13765 Textiles Color fastness test Specification of linen and ramie standard lining fabrics
GB/T 32598-2016 Textiles Color fastness test Instrumental rating method for staining of lining fabrics
GB/T 32616-2016 Textiles-Color fastness test-Apparatus grading method for discoloration of samples
ISO 105-F07 Textiles-Color fastness test-Part 7.Specification of regenerated acetate fiber lining fabric
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Background material
When color fastness is measured, the white material lined on the back of the sample and the reference sample.
4 Principle
According to the principles of GB/T 32598-2016 and GB/T 32616-2016, the image information is controlled by the color fastness automatic rating workstation
Information collection and spectrophotometric color measurement system to obtain sample position and color difference information, calculate and output the results, and realize the self-grading of sample color fastness
Dynamic assessment.
5 Materials and equipment
5.1 Test materials
5.1.1 Standard Gray Card
Gray sample card for evaluating discoloration, in line with GB/T 250.
Gray sample card for staining assessment, in line with GB/T 251.
5.1.2 Color fastness control sample
A sample whose color fastness or staining level is known.
5.1.3 Stained reference sample
Use a lining fabric that has not been in contact with the sample and has undergone a color fastness test as a reference sample for the staining fastness rating.
The lining fabric should comply with GB/T 7568.1~GB/T 7568.7, GB/T 13765, ISO 105-F07.
5.1.4 Color change reference sample
5.1.4.1 General situation
A sample that has not been tested for color fastness is used as a reference sample for the color fastness rating.
5.1.4.2 Special circumstances
For some fabrics with obvious color difference between wetting and non-wetting, in accordance with the provisions of GB/T 6151, treat them as discoloration after they are treated as they are
Reference sample for fastness rating. This situation should be noted in the report.
5.1.5 Background material
5.1.5.1 Cotton standard lining
The specifications meet the requirements of 4.1 in GB/T 7568.2-2008.
5.1.5.2 Original recording paper
It is white with uniform texture, and the L value of CIELAB measured by the automatic grading system for color fastness is greater than 95.
Note. In the CIELAB color space, a color is characterized by three parameters. L (brightness), a color, and b color. L stands for Luminosity, relative
Regarding the brightness, the value of L is 0~100 (pure black-pure white). a represents the range from red to green, and the value of a is 127~-128 (magenta-green). b
Indicates the range from yellow to blue, and the value of b is 127~-128 (yellow-blue). Positive values are warm colors, and negative values are cool colors.
5.2 Equipment
Color fastness automatic rating system, measuring geometric conditions (di. 8°), CIE 10° observer and D65 light source. See Appendix A.
6 Sample preparation
6.1 Color fastness
Put the color fastness reference sample and the lining fabric after the color fastness test on a layer of cotton standard lining or paste the four corners on the
On the original recording paper, make the side of the lining fabric in contact with the sample face up, and then place it on the specified position on the sample table.
6.2 Color fastness
6.2.1 General
Put the color fastness reference sample and the color fastness test sample on a layer of cotton standard lining or paste the four corners
On the original recording paper, then place it in the specified position on the sample stage.
6.2.2 Special circumstances
For some samples whose appearance (such as pile arrangement, structure, gloss, etc.) has also changed in addition to discoloration, follow
GB/T 6151 stipulates that the sample should be processed to restore the sample to its original state as much as possible, and then prepare the sample according to 6.2.1.In this case, if
If it cannot be restored to its original state, the overall change in appearance should also be noted in the report.
7 Test method
7.1 Black and white board calibration
Through the workstation, black calibration and white calibration are performed separately.
7.2 Equipment verification
Use the color fastness control sample of similar color system and/or the gray sample card for evaluating discoloration and the gray sample card for evaluating staining, in accordance with
7.3~7.5 steps to test; observe the test results, if the results are consistent, continue the experiment; if not, refer to Appendix B for screening,
Until the problem is solved.
7.3 Select test type
The correct staining and discoloration test type should be selected according to the needs to ensure that the rating system uses the correct staining and discoloration formula to
Ensure the accuracy of the rating results.
7.4 Image acquisition
Start the image acquisition function to collect the position information and discoloration and staining information of the sample.
Note. After the information is collected, the position of the sample on the sample table must not be changed, otherwise it should be collected again.
7.5 Reference sample measurement
Staining fastness. On the sample information displayed on the computer screen, select any position of the staining fastness reference sample to measure.
Color fastness. On the sample information displayed on the computer screen, select any position of the color fastness reference sample for measurement.
7.6 Sample measurement
Staining fastness. Observe the sample information displayed on the computer screen, and select the darkest color of the patch according to the staining situation of the patch fabric
The position is randomly measured 3 times.
Color fastness. Observe the sample information displayed on the computer display screen, and select the position with the largest color change according to the condition of the color-changing sample
Random measurement 3 times.
7.7 Presentation of results
7.7.1 Staining level
After the test, the color difference between the lining fabric and the corresponding staining fastness reference sample is calculated according to the regulations in GB/T 32598-2016, and the result is
The SSR value is accurate to 0.01, and the report result is in accordance with the level corresponding to 6.6 Table 1 in GB/T 32598-2016.See Table C.1 in Appendix C.
7.7.2 Discoloration level
The color difference between the sample and the corresponding color fastness reference sample is calculated in accordance with the regulations in GB/T 32616-2016 to obtain the GSC value
Accurate to 0.01, the report result is in accordance with the level corresponding to Table 1 in GB/T 32616-2016.See Table C.2.in Appendix C.
7.7.3 Final result
Take the lowest level as the final result, expressed in the nearest half level, unit. level.
8 Test report
The test report should include the following.
a) The number of this standard adopted;
b) Sample description;
c) The equipment used;
d) Type of lining;
e) Color fastness grade;
f) Color fastness grade;
g) Test date;
h) Need to add explanations if necessary.
Appendix A
(Informative appendix)
Color fastness automatic rating system
A.1 Host
The host structure is shown in Figure A.1 and Figure A.2.
A.1.1 Light box
The color of the cabinet is neutral gray, which is close to the Monsell color card N5, and the light source is D65.
A.1.2 Spectrophotometer
Measure the chromatic aberration of the sample (△ E), the measuring geometric condition of the instrument is (di. 8°), CIE 10° observer and D65 light source, the measuring aperture does not exceed
Over 8 mm.
A.1.3 HD camera or HD camera
Collect information such as the location and color of the sample. It can zoom, with more than 24 million pixels.
A.1.4 Robotic arm
Carry the color measuring instrument for three-dimensional movement, accurately move to the designated position of the sample stage, and ensure that the color measuring instrument is in close contact with the sample under test. Bit
The positioning accuracy is φ0.2 mm~2 mm. The moving range is within 300 mm×300 mm or φ300 mm.
A.1.5 Sample stage
It is mainly used to place samples, with a layer of soft foam board and three layers of pure cotton standard lining. Effective measuring range. 297 mm×210 mm.
A.2 Workstation
A.2.1 Computer
Can adapt to the requirements of software work.
A.2.2 Automatic rating software for textile color fastness
Take pictures, position the color measuring instrument, measure, calculate, and output results through instructions.
Appendix B
(Informative appendix)
Equipment verification problem screening
B.1 Test type
To check whether the test type is correct, choose discoloration or staining according to the color fastness test type.
B.2 Integrity of the tested area
Check whether the measured area completely falls within the measuring aperture range of the color meter.
B.3 Measuring position
Check whether the position of the sample changes after taking pictures; check whether the designated position of the workstation matches the actual moving position of the color measuring instrument.
B.4 Contact tightness
Check whether the colorimeter is in close contact with the sample. The color measuring instrument should compact the sample without light leakage; it is in close contact and can maintain the sample
Not deformed.
B.5 Cleanliness of black and white boards
Observe whether the blackboard or whiteboard is contaminated.
B.6 Equipment failure
After the above problems are eliminated, the verification results still do not meet the requirements, and professional and technical personnel should be asked to overhaul the equipment.
Appendix C
(Informative appendix)
Staining grade and color changing grade
...
