Wrapping film is becoming more and more widely used in product packaging, and the sales of wrap film are increasing, but most buyers don't understand what kind of packaging is better. Is there any way to know the quality of wrap film when buying? The following details how to judge the good and bad of stretch wrap film.
1、Self-adhesive
Self-adhesiveness refers to the adhesion of the wrap film after contact with each other. This characteristic can make the packaging items tight and not loose during the stretching and wrapping process. Self-adhesiveness is affected by various external factors, such as humidity, dust and pollutants, which is also an important indicator to detect its goodness.
2、Toughness
Toughness refers to the comprehensive performance of film resistance to punctures and tears. The dangerous value of tear resistance must be taken as horizontal, i.e. perpendicular to the direction of machine operation, because tearing in this direction will make the package lose, and even if tearing occurs longitudinally, the package can still remain firm. Therefore, the better the toughness of the wrap film, the more reliable it is.
3、Stretching performance
Stretching is the ability of the film to elongate after being stressed. A good quality stretch film will have some length extension after stretching, and it is within a certain range.
Test method.
In actual contact you can buy back to see his tensile force, the tensile force is large, it means that the quality is okay, if the winding film puncture resistance is poor, easy to be sharp objects puncture breakage, resulting in products or goods lose separation, can not play a protective role, judging from the sticky top, this can be done by hand to try the sticky degree, it can be a good judge of the strength of the stretch film adhesion.
According to the stretching ratio, we can stretch the film from the length of the stretching film outward, and then in the horizontal stretching, so that can also be a good judge of good or bad; the same if the stretching film is too thin, then the toughness can be seen without testing the stretching is not good.