The singe quality was assessed visually according to the standards promulgated by the former Ministry of Textiles. It was divided into five grades: grade 1 was unsinged with raw sliver; grade 2 was less long hair; grade 3 was essentially no long hair; grade 4 was only There are more regular short hairs; 5 is singe clean. The grade after fabric singeing should generally reach 3 to 4 levels to qualify.
At present, most manufacturers are singeing in the first process according to the traditional process route for many years, so that the process is relatively smooth and easy to manage. However, when the
grey fabric is directly singed, the fabric surface is not smooth enough, and defects such as singeing and singeing are easily generated. The quality of the singe is not satisfactory. At the same time, the
gray fabric containing the slurry is subjected to high temperature treatment at the singeing mouth. Later, it may make some of the warp yarns more difficult to conjunctiva and increase its degree of polymerization, which is not conducive to the desizing process in the subsequent process. Now the factory has arranged the singeing process after the scouring. After the scouring, the hairiness of the original warp yarn sizing wrapped in the sizing film will be fully exposed, which is more conducive to raising the singeing quality and the singeing level is higher. The finished fabric is also smoother. The disadvantage of post-singeing is that the singeed fabric will leave behind a small amount of black fibrous cellulose powder. When it is mercerized, it will fall into the alkali bath and it will contaminate the light alkali liquor. This kind of lye will bleach the mercerized white cloth. Degree will have a certain influence. However, the author is still in favor of more promotion of singeing and singeing after scouring. After singeing, rinsing is performed with water or oxygen bleaching. It is still a more profitable and less technical arrangement.
There are mainly singeing defects, singeing and burning, and other defects. The singeing on the printed and dyed finished fabrics is not net. In addition to affecting the appearance quality, it is easy to absorb dust when wearing clothes. At the same time, the unvulcanized fluff of the fabric will fall off due to friction during the subsequent processing. The formed flower coat is adsorbed on the surface of the fabric, and the formation of a white fleece in the dyeing and printing process also affects the quality of the dyed product.
For thin polyester-cotton blended fabrics and nylon-cotton blended fabrics, care should be taken to prevent over-burning because they contain thermoplastic fibers. Once the singeing process conditions are too strong or not well controlled, thermoplastic fibers melt and occur. A major quality accident that caused the cloth to be scrapped. In addition, it should be noted that for synthetic fabrics with synthetic filaments, printing and dyeing plants usually use a non-singe process to ensure the safety of the process.
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