In daily life, it is common to see yellowing of white polyester fabrics in a certain age. What is the reason for this phenomenon, and how to solve it? 
Reasons and solutions for yellowing of white polyester fabric
The white polyester fabric produces yellow spots due to poor water quality and high ferrous ions. The ferrous ions are oxidized or ferric ions for a long time, thus forming a yellow spot on the line. This macula not only affects the appearance quality, but also makes the fiber brittle. When the water quality is poor, it can be acid washed with oxalic acid 1.5-2.0g/L before bleaching, at 80-85 °C, because oxalic acid can form complex ions with iron ions and dissolve in water, iron in water can be Remove, to achieve the purpose of not yellowing.
In addition, it should be noted that when dechlorination is carried out after bleaching with sodium hypochlorite, the amount of baking soda is too much or not washed, and the line is yellowed.
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