The quality of singeing is evaluated visually based on the standards issued by the original fabric department, and is divided into five levels: level 1 refers to the raw material without singeing; Level 2 has less long hair; Level 3 is basically without long hair; Level 4 has only relatively neat short hair; Level 5 refers to clean singeing. The level of fabric after singeing should generally reach 3-4 to be considered qualified.
Now, manufacturers have arranged the singeing process after boiling. After boiling, the hairiness of the original warp yarn wrapped in the size film will be fully exposed, which is more conducive to improving the singeing quality, making the singeing level higher, and the finished fabric surface cleaner. The disadvantage of post singeing is that a small amount of black powder of fiber carbides will be left on the fabric after singeing, and when it falls into the light alkali tank after the yarn is finished, it will stain the light alkali solution. This kind of alkali solution will have a positive impact on the whiteness of the bleached fabric after the yarn is finished. However, the author still supports more promotion and application of the scouring and singeing process, which involves arranging water washing or oxygen bleaching after singeing. It is still a process arrangement with more advantages and less disadvantages.
There are mainly defects such as poor singeing and singeing streaks. Unclean singeing on printed and dyed finished fabrics not only affects the appearance quality, but also easily adsorbs dust during the wearing process when making work clothes. At the same time, some of the unburned down of the fabric will be adsorbed on the surface of the fabric due to friction and detachment during subsequent finishing, and the formation of white spots on the flower coat hair during the coloring and printing processes will also have an impact on the quality of the printed and dyed products.
For light and thin polyester cotton blended chemical fiber fabrics and polyamide cotton blended chemical fiber fabrics, attention should be paid to preventing the occurrence of overburning, as they contain thermoplastic fibers. Once the singeing process conditions are too strong or the operation is not well controlled, significant quality accidents such as thermoplastic fiber melting and fabric scrap can occur. Others, attention should be paid to the interlacing of Synthetic fiber filaments. The printing and dyeing factory usually adopts the non singeing process to ensure the safety of the process.
The vertical combustion tester is an instrument used to test the vertical combustion resistance of children's pajamas or decorative fabrics.
1. Stainless steel combustion testing chamber ensures the safety of the testing process.
2. The entire process of combustion testing can be observed through glass doors and windows, and the flame propagation time and testing status can be recorded.
3. The automatic gas control valve controls the flame size and combustion time of the standard burner.
4. After the sample is ignited, the timer can be used to record the open flame combustion time and the negative flame combustion time of the sample.
5. Configure different test sample clamps and auxiliary fixtures according to different testing standards.
6. Equipped with vertical burning Bunsen burner and side burner