This article elaborates on the common problems in fiber content detection of knitted thermal underwear, analyzes the causes of these problems, and proposes corresponding solutions. The fiber content of knitted thermal underwear is an important indicator for its quality assessment. The type and amount of fiber content directly affect the performance and sales price of the entire underwear, so both merchants and consumers are very concerned. However, manufacturers often find that there are some differences between the fiber content of the initial design and feeding of knitted thermal underwear and the actual fiber content measured by textile testing institutions. This article analyzes the relevant issues in fiber content testing of knitted thermal underwear based on specific products. The problem of deviation in quantitative analysis of spandex products is very widespread in the application of thermal underwear. It can endow thermal underwear with better wearing and comfort, achieving a combination of body shaping and thermal function. In the process of testing thermal underwear containing spandex, there are significant differences in spandex content measured using different testing methods, which often leads to disputes. Baijian Testing Platform is an internet testing platform founded by Baijian (Shanghai) Information Technology Co., Ltd., focusing on aggregating excellent testing service institutions across the country to serve small and medium-sized enterprises and inpidual users. The platform relies on an intelligent omnichannel service docking system, a fully capable qualified big data center, and a one-on-one follow-up service philosophy of professional technical engineers. It is committed to achieving the most convenient, high-quality, and professional cloud detection services, and hundreds of inspections work together with high-quality detection institutions to usher in a new era of internet detection

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