Assessment, arrangement and defects of singeing grade
The quality of singeing is evaluated visually with reference to the standards promulgated by the Ministry of Raw Materials. It is divided into five levels: Level 1 means that the raw material has not been singed; Level 2 Level 3 means less long hair; level 3 means basically no long hair; level 4 means only 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
It is also easy to manage. However, when natural cotton cloth is directly singed, because the cloth surface is not flat enough, defects such as dirty singeing and singeing streaks can easily occur. The singeing quality is not satisfactory. At the same time, the natural cotton cloth containing pulp is passed through the singeing burner. After high-temperature treatment, some sizing materials (? Y8) in the warp yarns may form films more easily, thereby increasing the degree of polymerization, which is not conducive to desizing in subsequent processes. 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. Perfect. The disadvantage of post-singing is that the fabric after singeing will
A small amount of black powder of fiber carbide remains. When the silk is finished, it will fall into the light alkali tank and contaminate the light alkali solution. Such alkali solution will have a certain impact on the whiteness of the bleached cloth. 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.
Mainly include defects such as poor singeing and singeing stripes. In addition to affecting the appearance quality of printed and dyed finished fabrics, dirty workwear can also easily absorb dust during wearing. At the same time, some of the unburned fluff of the fabric will fall off due to friction during subsequent finishing.
The formed floral wool is adsorbed on the surface of the fabric, and the white spots of floral wool formed during the coloring and printing processes also have an impact on the quality of the finished printing and dyeing products.
For light and thin polyester-cotton blended chemical fiber fabrics and nylon-cotton blended chemical fiber fabrics, attention should be paid to preventing over-burning, because they contain thermoplastic fibers. Once the singeing process conditions are too strong or the operation If the fabric is not properly controlled, the thermoplastic fibers will melt and cause the fabric to snap.
major quality accidents. In addition, attention should be paid to the interlacing of synthetic fiber filaments. Printing and dyeing factories usually adopt a non-singing process to ensure the safety of the process.
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