3 Easy ways to distinguish the quality of the stretch film

There are many quality inspection standards for stretch film, such as stretch rate, retraction stress, and gas permeability. But most standards require instrumentation for testing. However, when you are shopping for a stretch film, many times you don't have any instruments on your body. How do you tell the quality of the stretch film? As a professional stretch film manufacturer, Runte Rubber and Plastics will teach you several simple identification methods:

1. Stretching film to test the elongation rate
The draw ratio is an important index for judging the quality of the stretch film. Generally, the stretch ratio of the stretch film is between 200% and 600%.

The stretched film to be tested can be stretched longitudinally, and the degree of deformation of the wound film can be visually observed. According to the force change (the resistance changes linearly within the film receiving range, if it exceeds this range, the resistance will decrease sharply, according to This phenomenon is used to judge the stretch ratio of the stretched film) to judge his stretch ratio and judge the quality of the stretched film.

2, observe the gloss of the surface of the stretch film

The quality of the wound film raw material is high in purity, and the surface of the film is fresh and textured. The quality is poor or the recycled material is rough on the surface of the film, and it feels no vitality. This is due to the fact that the manufacturer has over-added magnesium powder and calcium carbonate to cover the raw material impurities, resulting in a relatively rigid film surface. The quality can be roughly judged by observing the gloss of the surface of the wound film.

    3, vertical pairing test viscosity

    The stretch film is viscous, which allows it to be wrapped around the package to better protect the product. A viscous stretch film is generally of higher quality.

    A piece of the film to be inspected can be taken, stacked vertically twice, pressed by hand, and then peeled off, and the viscosity of the film can be determined according to the ease of uncovering and the degree of damage of the film surface.

    The above is the simple method to distinguish the quality of the stretch film introduced by Runte Rubber and Plastics. I hope that everyone can flexibly use the satisfactory wrapping film products.