Gester Instruments | Professional Textile, Footwear and PPE Testing Equipments Manufacturers Since 1997
Problems and Suggestions of Method Standards in Textile Testing
In the long-term testing of textile products, the inspectors have found that some method standards have problems in actual operation, mainly including the selection of test conditions in the standard, the calibration of the instrument, the rounding of values, the interpretation of calculation formulas, and the process of some testing operations. Specific details of the processing methods, etc. These problems may directly affect the consistency and comparability of inspections between inspectors or inspection agencies, and even directly affect the determination of product inspection results. 1. The test method of fabric fuzzing and pilling 1. The 'test conditions' in the test method of fabric fuzzing and pilling by the circular track method GB/T 4802.1-2008 'Determination of the fabric fuzzing and pilling performance of textiles-Part 1 Circular track method' standard test The selection and classification of conditions is not clear, resulting in a fabric that may have a variety of test conditions to choose from or unconditionally to choose. For example, the test condition A of this standard is suitable for sportswear, and the test condition B is suitable for synthetic fiber filament fabrics. For sportswear made of synthetic fiber filament fabrics, two test conditions A and B can be used. However, fabrics made of pure chemical short fibers and fabrics such as pure cotton and pure silk can be selected unconditionally if they refer to the standard classification. Although the remarks of the standard indicate: other fabrics not listed can refer to the similar fabrics listed in the table or select the parameter category according to the agreement of the relevant parties, but different testers or inspection agencies may choose different test conditions, which brings about the operation. Uncertainty makes the test results incomparable. Therefore, it is recommended to make a clearer and more detailed classification of the applicable fabric types under the test conditions of this standard to avoid the occurrence of the above situations. 2. The 'reference fabric' for the pilling performance of the verification instrument in the four standards for fabric pilling GB/T 4802.1-2008 'Determination of the pilling performance of textile fabrics Part 1: Circular path method' and GB/T 4802.3 —The 2008 'Determination of the Pilling Performance of Textile Fabrics Part 3: Circular Track Method' all stipulated the 'reference fabric' used to check the pilling degree of the pilling instrument. 'Reference fabrics' are 2 to 3 types of fabrics per group (from 1 to 2 to 4), which are used to compare the initial standard samples to determine the degree of change in the pilling effect of the instrument on a regular basis or when necessary. At present, the pilling effects of these two pilling methods produced by various instrument manufacturers are quite different, especially the circular track pilling pilling instrument, but there is no uniform fabric as a 'reference fabric' or 'standard'. It is difficult to control and compare the pilling effect of different pilling instruments produced by different instrument manufacturers or even the same instrument manufacturer, and it is also difficult to guarantee the pilling performance used by the testing institutions. The consistency of the pilling performance of the ball machine. From the data of the comparison results between the laboratories, it can be seen that the difference in the detection results of the pilling items between the testing institutions can reach 1.5 levels, which shows the seriousness of the problem. Therefore, I personally suggest that the reference material production unit should design and produce a set of reference materials as soon as possible, unify the pilling performance of the pilling and pilling instruments of each testing organization and each instrument manufacturer, so that the testing results of each testing organization are comparable. 3. Revision of the pilling test results. GB/T 4802.1～4 'Determination of the Pilling Performance of Textile Fabrics' standards stipulate that the calculation method of the sample rating results is: the rating result of a single person is based on the rating of all samples Average value, the test result of the sample is the average value of all personnel ratings. If the average value is not an integer, it shall be rounded to the nearest 0.5 level. There are no rounding rules here. When the decimal point of the average value is exactly 0.25 or 0.75, there can be two rounding results for rounding to the nearest 0.5 level, and the final results may be reported inconsistent among different personnel or different organizations. For example, the revision from 3.25 to the nearest 0.5 can be revised to 3.5 or 3.0. In the case that the test results, the evaluation level of the sample, and the number of persons participating in the evaluation are consistent, the test results may differ by 0.5 level only because the standard does not clearly stipulate the rounding rules. If the test result of the product is just at the critical value of qualified and unqualified, it may also result in the result of unqualified judgment due to the different rounding methods. It is recommended that the method of contract modification be clearly defined in the standard. For example, rounding according to the standard of GB/T 8170 'Rule of Rounding Values u200bu200band Representation and Judgment of Limit ValuesClause 8.2 stipulates the rounding method, taking the arithmetic mean of the rating grade as the result, and stipulates that it is expressed in the nearest half or whole grade. When the arithmetic mean is one-quarter or three-quarters, The assessment should take the adjacent higher half or first level, that is, the level 3.25 is rounded to 3.5; the level 3.75 is rounded to 4.0. In this way, the inspection methods of the inspection personnel can be kept consistent, and the consistency of the inspection results can be ensured.
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