Textile and clothing testing

The textile testing equipment technology mainly includes fiber content analysis and inspection, chemical analysis inspection, down inspection, color fastness inspection, physical index inspection and other aspects. 


Question 1: How to qualitatively identify metal coated fibers?

Answer: Observed under a microscope, metal-coated fibers have significant characteristics in both longitudinal and cross-sectional shapes, especially the longitudinal characteristics are more obvious, usually in a black opaque state, and the cross-section is a flat rectangle or nearly circular with black borders. The metal element analysis method can be used to test the metal content of the fiber to further confirm whether a fiber is a metal-coated fiber. If it is confirmed that the surface of the fiber is metal-coated by microscope method, metal content test method, etc., it can be issued as "metal-coated fiber". 


Question 2: When fabrics containing conductive fibers are tested for fiber content, can the test report include the name of the conductive fiber?

Answer: Conductive fibers and anti-static fabrics are recommended to use surface (or volume, etc.) specific resistance, anti-static performance and other items to test to prove their functions. As currently GB/T 29862-2013 "Identification of Textile Fiber Content" and standard reference documents do not have the name and definition of conductive fiber, it is not recommended to issue this name during fiber content testing.

 

Question 3: How to make qualitative and quantitative analysis for fabrics containing protein-modified polyacrylonitrile fiber?

Answer: The protein component of the protein-modified polyacrylonitrile fiber may change during the printing and dyeing process of the fabric. This change will bring difficulties to the qualitative identification of the fiber, especially the quantitative analysis of the fiber composition. When the common qualitative identification methods such as combustion method, microscopy method, dissolution method, and infrared spectroscopy cannot be accurately qualitative, the amino acid analysis method can be used in conjunction with the qualitative identification. When an abnormal dissolution phenomenon is found in the process of quantitative analysis using the dissolution method, the physical method may be preferred for quantitative analysis.


Question 4: How to deal with the residual fat rate test in Appendix C of GB/T 14272-2011 "Down Clothing" when the results of two parallel samples are unbalanced and the difference is large?

Answer: It is recommended to refer to FZ/T 20018-2010 "Determination of Dichloromethane Soluble Substances in Wool Textiles" and GB/T 6504-2008 "Test Method for Oil Content of Chemical Fibers" Method A- Extraction Method: The test results are based on two samples The arithmetic mean of the two parallel tests is greater than 20%, the third sample test should be carried out, and the test results are expressed as the arithmetic mean of the three tests.


Question 5: How to label the composition of artificial leather clothing fabrics?

Answer: It can be marked according to the following two standards. One is FZ/T 81018-2014 "Woven Artificial Leather Clothing" Standard 3.1 Instructions: "The artificial leather Fabric Testing Machine should be marked with the main type of coating, and the instructions for the remaining finished products are in accordance with GB 5296.4."; The other is FZ/T 73028-2009 "Knitted Artificial Leather Clothing" Standard 4.1.1 "Artificial leather fabrics are only marked with artificial leather types, and the instructions for use of other products shall be implemented in accordance with the provisions of GB 5296.4", that is, artificial leather fabrics can only be marked with the main type of coating.

 

Question 6: How to identify POM fiber? How to issue a test report?

Answer: The use of qualitative identification methods such as dissolution method, melting point method, infrared spectroscopy and other qualitative identification methods can confirm that the chemical composition of the fiber is "polyoxymethylene". Before its uniform naming is not included in the standard of chemical fiber genus name, it is based on The provisions of B.5 in GB/T 29862-2013 "Identification of Textile Fiber Content" can be marked as "new chemical fiber", and if necessary, the manufacturer may be required to provide relevant certification materials. 


Question 7: When preparing the down cleanliness and oxygen consumption test sample solution of GB/T 14272-2011 "Down Clothing", the down sample failed to be completely immersed in water after 30 minutes of shaking, and floated on the water. How to deal with it?

Answer: Filter according to the standard requirements, test the cleanliness and oxygen consumption of the sample liquid, and note in the original record such as "The sample is not completely immersed in water".

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