manual stretch film sample freely

When testing the stretch film, first look at the surface of the stretch film to see whether the transparency of the stretch film is good, whether the color is bright, whether there is any damage, whether there is perforation, etc.;

2. Stretch film manufacturers suggest that you check the flatness of the heat-shrinkable film. You can take a stretch film at random to see if there is any wrinkle and shrinkage trace.

3. Look at the outer package of stretch film, see if there is any information such as product name, manufacturer, date and quantity on the surface, and the surface should be bright and clean without dust.Stretch film manufacturers conduct quality inspection before packaging, and only qualified products can enter the market.

First of all, stretch film needs to have good transparency in the use, you can choose transparent plastic transmittance and haze test methods. Then, the viscosity, tension retention, permanent deformation, elastic recovery and puncture resistance in the standard are the test method standards for stretch film developed by ASTM in the United States. However, it is noted that the mass per unit area is only defined as the area per unit mass in China's standard, and it is not applicable to stretch film. Thirdly, the water vapor transmittance of the film can be examined by the test method standard of water vapor permeability of the stretch film and the sheet material. Can the stretch film protect the product from moisture or moisture absorption, i.e. the tightness after winding, in the sea transportation or in the environment with high humidity.

Both please check website. www.cn-packing.com