What is the effect of the PE stretch wrapping film's viscosity？ - Gongye Packing

What is the effect of the PE stretch wrapping film's viscosity？ - Gongye Packing: The viscosity of the PE stretch wrapping film is very important in the packaging process of the article. It should have both good peeling adhesion and good lap adhesion.

The viscosity of the PE stretch wrapping film is very important in the packaging process of the article. It should have both good peeling adhesion and good lap adhesion. The higher the peeling viscosity, the less likely the pallet will loosen and the better the sealing of the film. The higher the lap adhesion, the less likely the film will be longitudinally displaced, so if you want to obtain a tight package, you need to achieve a balance between the peel adhesion and lap adhesion of the wrapping film.

The viscosity of the PE stretch stretch film is affected by three factors.

1. The effect of molecular weight on the viscosity of PE stretch wrapping film

Different molecular weights will change the adhesion performance. The high molecular weight PIB makes the film have a higher final peel adhesion, but as the PIB molecular weight increases, the lap adhesion will gradually decline; if the molecular weight is too low, Because it is more volatile, it will cause the sticky sticking time to be too short. Therefore, the selection of PIB with appropriate molecular weight can make the stretch film have the best performance.

2. Effect of Adding Amount on Viscosity of PE stretch wrapping film

The viscosity of PE stretch wrapping film is positively correlated with the amount of PIB added. However, as the PIB participation exceeds 3%, the progress of the self-adhesiveness of the wrapping film becomes insignificant. If you continue to increase the amount of PIB added, the PIB will precipitate on the outer surface of the film and form a lump, resulting in uneven self-adhesiveness of the film, and even The film roll is difficult to open. In order to ensure the final performance of the stretch film, the amount of PIB added should be controlled between 1 and 3%.

PIB has an exudation process, and it usually takes about three days to wrap around the membrane surface to produce enough viscosity.

3. Effect of storage temperature of PE stretch wrapping film on viscosity

The migration speed of PIB is related to the storage temperature. As the temperature of the environment increases, the migration speed of PIB increases and the viscosity increases. Therefore, to reach the required viscosity, the stretch film should be stored at a higher temperature, and the required viscosity can be reached after one week. However, PIB will be precipitated in large quantities for long-term storage at temperatures above 30℃, which may cause the film roll head or paper core to come out. Therefore, after reaching the viscosity request, it should be placed in an environment of -15℃~40℃. Storage.

Dongguan Gongye Plastic Packing Co.Ltd is a professional manufacturer of environmental plastic packaging materials with more than 20 years experience,The company has professional technical personnel, advanced production technology and equipments.focus on PVC Stretch Film，PE Stretch Film，Food Grade Cling Film，Packing Belt，Cable Packaging Film，Carton Sealing Tape，Handle For Stretch Film.all products have obtained SGS environmental testing , and in accord with the European Union ROHS standards.we have perfect customizd service and after-sales service,if have any qustions,please feel free contact us.    

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