SN/T 5241-2020Import and export textiles automatic evaluation method of color fastness grade (English PDF)

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.

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.

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

6 Sample preparation

7 Test method

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 (delta 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 phi0.2 mm~2 mm. The moving range is within 300 mm×300 mm or phi300 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