Stretch film is a polymer film product in technical terms. For quality, it is necessary to use instruments. Many consumers buy in bulk. But, no test was performed, and it is not known whether the quality of the stretch film is good or bad. From which points to determine the quality of stretched film? Let Jiatong Packaging do a detailed analysis for everyone.

1： Instrument
Use instruments like tensile testing machines, puncture testing machines, etc. to check the quality of the stretched film. But, this method is aimed at professional testing. And most people do not have such testing conditions.

2： Appearance
The stretch film's plug-in shows a soft, natural color and good transparency. A newspaper is placed 20 cm below the stretch film. And the characters can be seen without being affected by reading. It means there is a high-quality stretched film. So, it is a low-quality stretched film.

3： Stretching
A high-quality stretch film can be stretched very long, in the range of 300% -700%, it will not be broken. The inferior stretched film will become thin when stretched, and it will break when it is pulled.

4: Self-adhesive
The function of self-adhesion is to fasten the packaged items without loosening. For example, wrapping eggs and pressing them can lift the eggs, but poor quality stretch films do not have this function.

5: Toughness
When the stretched film is torn. But the packaging can maintain a firm state, indicating that the quality of the stretched film is high, and vice versa. The stretch film can also be wrapped with water. After puncturing, there is no water leakage in the depth of 5 cm, which means that it is of high quality. But, the quality is not good.