Why Does Bleaching And Whitening Yarn Appear Yellowing?
The main reason is that the macula is caused by poor quality of bleaching and two iron ions. Two valent iron ions are oxidized or ferric ions for a long time, thus forming macula on the yarn.
This macular not only affects the appearance quality, but also makes the fiber brittle.
The way to overcome this problem is to use oxalic acid 1.5-2.0g/L before bleaching and pickling at 80-85 C in case of poor water quality.
Because oxalic acid can form complex ions with iron ions and dissolve in water, the iron in water can be removed to achieve non yellowing purposes.
White and whitening
yarn
After a certain period of time, macula is produced. Two, the whiteness decreases with time.
The reason for the analysis is that the macula is caused by the poor quality of bleaching and the high iron content of two. The two valent iron is oxidized or ferric ion for a long time, so that the macula is formed on the yarn.
This yellow spot not only affects the quality of the appearance, but also makes the fiber brittle.
The way to overcome this problem is to use oxalic acid 1.5-2.0g/L before bleaching and pickling at 80-85 C in case of poor water quality.
Because oxalic acid can form complex ions with iron ions and dissolve in water, the iron in water can be removed to achieve non yellowing purposes.
Bleaching and whitening
yarn
The main reason for the decrease of whiteness is that the scouring is not enough.
If the yarn is not adequately scoured, the impurities in the cotton fibers are not completely removed, and the yarn will be bleached and whitened immediately. After a long period of time, the impurities and natural pigments in the fibers will be exposed and the whiteness will be reduced.
The way to overcome this problem is to ensure that the bleached yarn has a gross effect of 13-15cm/30min, and the wool effect should be uniform, so as to ensure that the bleached and whitened yarns are not yellowed.
In addition, when sodium hypochlorite is used for bleaching and dechlorination, the consumption of large soda is too high or not washed.
yarn
Yellowing.
When the yarn is dried, the drying temperature is too high and the drying time is too long, which will cause yellowing of yarns.
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