Down is a kind of animal protein fiber, which is also the best natural material to keep warm. Its products for soft, fluffy and superior thermal performance and favored by the majority of consumers, many developed countries of down jacket products penetration rate reached 100%.
For many people, down is white and flawless, other colors are inferior, fake. I have heard many businesses said: ‘Customers bought down jacket products found under the fabric gray down, immediately returned the goods, the reason is that the product quality, very dirty.’
Is all down white?
Down can be divided into white down and heterochromatic down according to color, heterochromatic down is down flowers other than white down. There is no 100% pure white down in nature, if you want to achieve 100% pure white down, you can only manually pick, the cost is very high.
Why bleaching?
Compared with white downt, grey, black, yellow and other different color downt use limited, low price, in order to improve its economic value, sell a good price, “bleached down” came into being.
Oxidant treatment and reducing agent treatment are commonly used in heterochromatic down bleaching. The oxidizing bleaching mainly uses H2O2 as oxidant, which requires higher PH value, higher water bath temperature and longer oxidation time in the bleaching process. This method is difficult to control, prone to overoxidation or incomplete oxidation, resulting in brittle, easy yellow and serious color return after bleaching down. Oxidized down is strongly acidic, consumers use this kind of down has certain harm to the body. The reducing agent mainly plays the role of chemical shaping rather than bleaching on down.
The down feel, fragile, and lowering of the chemicals bleached by chemical agents, the down content will be greatly reduced in the next year, and the quality is greatly reduced. The bleaching strong acid sewage contains a large amount of metal ions. Even after processing, it will cause pollution to the environment.
Natural things are difficult to be flawless. Different color down is not impurities and dirty things. It has no effect on quality. The national standard stipulates that the heterogeneous down content is within 1%. Consumers love down because it is a natural protein fiber, which is light and warm -keeping performance, but some consumers pay more attention to the beauty of the down, and they can’t stand a little bit of strange flaws. This is a bit of it. Blind pursuit of white and flawless down, the ultimate use may be “bleaching down”!
Post time: Apr-20-2023