First, the stretchable scale of the stretched film

The stretchable scale refers to the maximum stretch that can be applied while maintaining a variety of necessary properties in a certain use. The stretchable size varies with different uses. The larger the stretchable size, the less the film is used and the lower the packaging cost.

Second, the self-adhesiveness of the stretch film

The adhesion between the stretched film films after touch, during the stretching process and after wrapping, enables the packaged product to be fastened without slackening. Self-adhesiveness is affected by many external factors. Such as humidity, dust and pollutants. There are two main ways to obtain a self-adhesive film. One is to process a smooth and shiny film; the other is to use an adhesive-adding additive to make the appearance of the film moist and then improve the adhesion.

Third, the stretching of the stretch film
Stretching is the ability of the film to elongate elastically after being subjected to tension. The longitudinal stretching is added, which will eventually thin the film and shorten the width. Although longitudinal stretching is advantageous, excessive stretching is often undesirable. Since this will make the film thin and tear, the tension applied to the package is added together.

Fourth, the toughness of the stretched film

Toughness is the comprehensive property of the film against tearing and tearing. The tear resistance refers only to the degree of tear resistance of the film after being subjected to tension and being removed. The risk value of the degree of tear resistance needs to be transverse, that is, perpendicular to the direction of operation of the machine, since tearing in this direction will loosen the package, and the package will remain strong even if the longitudinal tear is broken.
After these four points to distinguish, you can find the real, good quality stretch film. The packaging professional produces stretch film.