Causes of yellowing when stretch film is not used for a long time
Source：Mingye Packing Materials Co.,Ltd Release date：2020-10-30 Hits：861
Joypack is a professional stretch film manufacturer, providing high-quality stretch film products and competitive prices. After we buy the stretch film, we need to store it when it is not used for a long time. However, many times we find that some stretch films have turned from the original transparent color to yellow. What is the reason?
Strictly speaking, the stretch film has only two colors, colorless and colored. The main reason for the light yellow is DOV, color masterbatch and other additives or processing technology changes. If the color is light, the stretch rate and self-adhesiveness are not affected. If it affects, you can continue to use it. If the color is unnatural, the quality will be poor.
The stretch film technology has developed to now have been very mature, some manufacturers will try to change the formula to produce stretch film with different properties.
It is mainly reflected in three aspects: color, stretch rate and self-adhesiveness. A single color change does not necessarily affect the adaptation of the stretched film. It should be known that in many cases, the color of the stretched film will change due to the different melting temperatures set in processing. , But it will not affect its transparency. This is a better stretched film. If the stretch rate and self-adhesiveness decrease, it is a poor stretched film, which may be doped with other impurities.
If the color of the stretched film is light yellow, but the transparency, stretch rate and self-adhesiveness do not change, and there is no other peculiar smell, then it can be used. If the four indicators change, they can no longer be used.
Today, joypack stretch film manufacturers will share with you here. If you want to know more about stretch film related information and its wholesale price, please feel free to contact us and we will reply to you as soon as possible.
