YKK zipper No. 5 metal closed tail zipper

Metal zippers are ubiquitous in daily life. Do you know the reasons for the discoloration of metal zippers? Here are the reasons for the discoloration:
1. Color transfer dyeing of metal zipper tape:
Disperse dyes used in polyester webbing dyeing and other products containing compounds will produce transfer dyeing phenomenon. Therefore, although the zipper is dyed with anti transfer dyeing formula, you should be more careful when using dark zippers on white and plain fabrics. Transfer dyeing often occurs when the cloth is in contact with the zipper, but also due to temperature, air humidity, pressure, storage time and other factors. Therefore, it is best to put a layer of paper between the products to prevent migration.
2. Discoloration of metal zipper chain teeth:
The metal chain made of copper alloy (nickel, red copper and brass) is prepared on metal products and woolen products. Some teeth of the zipper will turn black due to metal oxidation, which is caused by the color change caused by the incomplete dissolution of the gas left on the product by the tanning agent and bleach. Oxidation is the property of copper. In order to reduce the degree of deformation, zipper products should not be sealed in cellophane or thick paper bags. Binding metal chains with rubber bands containing sulfide will lead to vulcanization (blackening) of metal chain teeth.