1. Maintaining the same sample and large sample cloth is the basic condition for improving the accuracy of the sample.
For pure cotton fabrics, due to the variety, origin, or maturity of the cotton fibers, the warp and weft density of the fabric, the different tissue specifications, and the different pre-treatment methods and pretreatment levels of the fabrics, the effects will be different. For chemical fiber fabrics and blended fabrics, such as pure polyester or polyester-cotton , polyester- viscose and other blended fabrics, due to the different raw materials, process operations, etc. used in the manufacture of synthetic fibers, will directly result in differences in fiber microstructure, resulting in different manufacturers, different brands Polyester dyeing, batch number, and specification have different color-removing properties.
In view of the above and other factors, when selecting proof fabrics, semi-finished fabrics used in large production must be used. If the sample blanks for large-scale production are not ready for supply in advance, the semi-finished fabrics similar to the semi-finished products may be used to make the initial samples. Preliminarily find out the prescription of basic materials. After the semi-finished fabric used in large-scale production comes out, strike a duplicate. If it does not match the standard shade, adjust the material until the duplicate is consistent with the village sample. In summary, only by ensuring that the sample size is consistent with the cloth, can avoid the size difference caused by different fiber quality, blending ratio, tissue size, whiteness, gloss, moisture absorption performance, etc., and improve the correct rate of sample magnification.
2. According to the dyeing and dyeing materials, the requirements for pre-treatment of grey fabrics are:
Due to the different shades and brightness of the dyed fabrics, the requirements for the grey fabric treatment are also different. For example, the light and vivid color shaded by the reactive dyes requires careful training and bleaching of the grey fabrics so that they have good whiteness and hairiness. Effect; For dark shades, half-drift or no-drift can be used.
In addition, because some dyes have some special properties, some special requirements are also put forward for the pretreatment process. For example, when reactive dyes are dyed, because the dyes are reactive dyes, they are sensitive to the chemical environment they are exposed to. Therefore, the requirements for pre-treatment of grey fabrics are :
1) Boil and float thoroughly to avoid waste of reactive dyes;
2) Can not bring chlorine, most of the reactive dyes resistant to chlorine bleaching is poor, if there is chlorine bleaching or bleaching powder stains on the cloth, most reactive dyes will be destroyed, so that the dyeing becomes lighter and darker;
3) After the pretreatment, the cloth surface appears neutral. Because the fabric with alkali, easily lead to uneven dyeing, cloth with acid will affect the dye due to, so that the color is light, the pre-treatment has a good capillary effect, the uniform pH of the cloth, PH value of 6 ~ 7.
In a word, the quality of the dyeing fabric and the choice of the pre-treatment process all have a certain influence on the dyeing and dyeing quality. Therefore, preparation of the grey fabric prior to dyeing and proofing is an important task that cannot be ignored.
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1,good mechanical characteristics: Meta-aramid is a flexible polymer, fracture strength is higher than ordinary polyester, cotton, nylon, etc., the extension rate is relatively large,
2, excellent flame retardant heat resistance: Aramid limit oxygen index(LOI) is greater than 28, so it will not continue to burn when it leaves the flame. The flame retardant property of the interposition aramid of HUVIS is determined by its own chemical structure, therefore a kind of permanent flame retardant fiber, and it will not reduce or lose flame retardant performance due to the time of use and the number of washes. Aramid has good thermal stability and can be used continuously at 205 °C, and can still maintain high strength at high temperatures greater than 205 °C. Huiwei's interposition aramid has a high decomposition temperature, and it will not melt or melt at high temperatures. When the temperature is greater than 370 °C, carbonization begins.
3, stable chemical properties: aramid has excellent resistance to most chemical substances, can withstand most high concentrations of inorganic acids, alkali resistance at room temperature is good.
Radiation resistance: The radiation resistance of aramid is very good. For example, its intensity remains unchanged under prolonged irradiation of 1.2 × 10-2 w/in2 ultraviolet rays and 1.72 × 108 rads gamma rays.
4, durability: Aramid 1313 excellent friction and chemical resistance performance, after 100 washes, the fabric processed with Neusda station aramid can still achieve more than 85 % of the original strength.
[flame retardant standard]
United States NFPA 1971, EU EN 469, Japan JIS L1091, China GB8965-98
Nomex Fiber,Dyed Aramid Fiber,Aramid Kevlar Fiber,Ballistic Aramid Fiber
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