Stretch film is a kind of packaging method that we often see in our life. It is of great value in food and medicine. But people often encounter a yellowish stretch film, which many people are confused about. As a professional stretch film manufacturer, let me introduce the reasons and effects of the yellowish film on the stretched film.

 

In fact, strictly speaking, the stretched film is only colorless and color. The yellowish color is mainly caused by additives such as dov and color masterbatch or processing technology. The development of stretch film to today's production process is very mature, some stretch film manufacturers will try to change the formula to produce different properties of stretch film, mainly reflected in three aspects: color, stretch rate and self-adhesive.

 

A single color change does not necessarily affect the use of the stretch film. It is known that many times the melt temperature of the process is set to cause a change in the color of the stretch film, but it does not affect the transparency. If the stretched film is light in color, the stretch ratio and self-adhesiveness are not affected. If the stretch film is not natural in color, the quality will generally be poor. If the elongation and self-adhesive properties are degraded, it may be mixed with impurities and cannot be used.

 

In summary, if the color of the stretched film is light yellow, but the transparency, elongation, self-adhesiveness does not change, and there is no odor, it can be selected. If the above four indicators of the stretch film also change, do not use it again.

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