Knitted Student Clothing

"Knitted Student Clothing (GB/T 22854-2009)" was proposed by the China Textile Industry Association. This standard is under the jurisdiction of the Knitwear Sub technical Committee of the National Textile Standardization Technical Committee (SAC/TC 209/SC 6). The drafting units of this standard include Zhejiang Fiber Inspection Bureau, Shenzhen Fiber Textile Testing Institute, Anta (China) Co., Ltd., Shenzhen Mogen Clothing Co., Ltd., Wenzhou Zhisheng Clothing Co., Ltd., National Knitting Product Quality Supervision and Inspection Center, Beijing Clothing Quality Supervision and Inspection Station, etc

Testing items for knitted student clothing:

Fiber content # 1, formaldehyde content, pH value, odor, decomposable aromatic amine dyes, color fastness to water, color fastness to sweat, color fastness to friction, bursting strength, seam strength, size change rate after washing, twist rate after washing, color fastness to soap washing, color fastness to light, color fastness to light and sweat combination (alkaline), pilling, moisture permeability, and degree of stitching and dyeing.

Item Note 1: Fiber Content # 1: The name and content of each component fiber in a textile product, expressed as a percentage of the total fiber content in a certain part of the product.

. Formaldehyde content: Formaldehyde is a colorless gas with a pungent odor. Textiles containing formaldehyde will gradually release free formaldehyde during use, which can cause respiratory and skin inflammation through contact with the human respiratory tract and skin. It can also cause irritation to the eyes. The pH value of textiles refers to the residual acid and alkali content in the fabric. If various chemicals in textile printing and dyeing processing are not fully washed or neutralized, the acidity and alkalinity on the fabric are too high, exceeding the range of pH adaptation of the human skin, which can easily cause skin itching, allergies, inflammation and other diseases, and even damage the sweat glands and nervous system of the human body, affecting human health. 4. If one or more odors, such as rain odor, high boiling range petroleum odor (such as gasoline or kerosene odor), fishy odor, or aromatic hydrocarbon odor, are detected in textiles with a peculiar smell, they are deemed to have a "peculiar smell" and the category of the odor is recorded. Decomposable aromatic amine dyes refer to dyes synthesized from carcinogenic aromatic amines, commonly known as "prohibited azo dyes". After decomposable aromatic amine dyes are made into clothes, they cannot be distinguished from the appearance of textiles and can only be detected through technical testing, and cannot be eliminated. This type of dye can cause various malignant diseases and absorb carcinogens when in contact with human skin. 6. Color fastness to water. The degree of fading of various textiles dyed or printed during use or processing under water washing. 7. Color Fastness to Sweat: The degree to which various textiles dyed or printed undergo fading under the action of sweat during use or processing. 8. Color Fastness to Friction: The degree of fading of various textiles dyed or printed under external friction during use or processing. 9. The force that the fabric bears when it expands to rupture. 10. The seam strength is stretched at a constant elongation rate perpendicular to the seam direction until the seam is damaged. Record the maximum force value that reaches the joint failure. 11. Washed size change rate refers to the size change in the length and width direction of a textile after washing and drying, usually expressed as a percentage of the original size change. After washing, clothing with a twisting rate of 12 will experience twisting at the side seams or edges, resulting in severe unevenness and deformation after wearing, thereby affecting the aesthetics and wearing effect of the clothing. 13. Color Fastness to Soap: The degree of fading of various textiles dyed or printed during use or processing under the action of soap washing. The degree of fading of various textiles dyed or printed with 14 light fastness under the action of light during use or processing. The degree of fading of various textiles dyed or printed with 15 light and sweat resistant composite color fastness (alkaline) under the action of light and sweat stains during use or processing. During the wearing process of 16 pilling fabric, due to the performance of the fabric itself and external friction, the surface of the fabric is fuzzed and pilled, forming a section of hair balls that are buried in the fibers of the fabric at one end and connected to the fabric surface at the other end. The hair balls are prone to dirt and dirt accumulation, which affects the aesthetics of the fabric. The phenomenon of pilling and pilling on the surface of fabrics can occur on both natural and chemical fiber fabrics, while wool textiles, synthetic fibers, and blended fabrics are more likely to occur. 17. Moisture permeability refers to the water vapor mass that vertically passes through a unit area of the sample under specified temperature conditions on both sides of the sample for a specified period of time. When fabrics and fabrics of different colors are spliced together with different degrees of mutual dyeing, they are prone to mutual staining after washing. Dyes usually migrate from dark to light areas, causing severe staining in light areas. At the same time, due to differences in fiber composition and dyeing methods, When combining dark and dark colors, such as bright red and purple, staining can also occur, affecting the appearance of textiles

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