Assessment, arrangement and defects of singeing grade

The quality of singeing is evaluated visually with reference to the standards promulgated by the original Ministry of Textile. It is divided into five levels: Level 1 is The raw material has not been singed; level 2 means less long hair; level 3 means basically no long hair; level 4 means only relatively neat short hair; level 5 means clean singeing. The grade of the fabric after singeing should generally reach grade 3 to 4 to be considered qualified.

At present, most manufacturers arrange singeing in one process according to the traditional process route for many years, so the process flow is relatively
Shun is also easy to manage. However, when the gray fabric is directly singed, because the cloth surface is not smooth enough, defects such as dirty singeing and singeing streaks are easy to occur, and the singeing quality is not satisfactory. At the same time, the gray fabric containing pulp is subjected to high-temperature treatment at the singeing burner. Afterwards, some sizing materials (? Y8) in the warp yarns may be more likely to form films, which will increase the degree of polymerization, which is not conducive to the desizing process in the subsequent process. There are now manufacturers that will
The singeing process is arranged to be carried out after scouring. After scouring, the hairiness wrapped in the sizing film of the original warp yarns will be fully exposed, which is more conducive to improving the quality of singeing, making the singeing level higher, and the finished cloth surface will be more beautiful. Smooth and clean. The disadvantage of post-singing is that the fabric after singeing will
A small amount of black powder of fiber carbide remains, which will contaminate the light alkali solution when it falls into the light alkali tank during mercerization. Such alkali solution will have a certain impact on the whiteness of the bleached cloth after mercerization. However, the author still favors more promotion of the application of the post-scouring singeing process, and the post-singeing process
Water washing or oxygen bleaching is a process arrangement with more advantages and fewer disadvantages.

The main defects include poor singeing, singeing streaks and other defects. In addition to affecting the appearance quality of the printed and dyed finished fabrics, the incomplete singeing will also affect the performance of the garments. It is also easy to absorb dust during wearing. At the same time, some of the unburned fluff of the fabric will fall off due to friction during subsequent processing.
The formed floral wool is adsorbed on the surface of the fabric, and the white spots of floral wool formed during the dyeing and printing processes also have an impact on the quality of the printed and dyed finished products.

For light polyester-cotton blended fabrics and nylon-cotton blended fabrics, care should be taken to prevent over-burning, because they contain thermoplastic fibers. Once singed, If the process conditions are too strong or the operation is not well controlled, the thermoplastic fibers will melt and cause the fabric to snap.
major quality accidents. In addition, it should be noted that for interwoven fabrics with synthetic fiber filaments, printing and dyeing factories usually adopt a non-singe process to ensure the safety of the process.

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