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Reasons for different shrinkage properties of stretch film
Source:Mingye Packing Materials Co.,Ltd   Release date:2021-01-25   Hits:664
When packaging, stretch film is a very useful tool. Its stretchability is very good. It can also be easily wrapped for items of different shapes, but we will find that when we use stretch film The shrinkage properties of different stretched films are also different, so what causes this situation?
Today, joypack stretch film manufacturers will introduce to you the reasons for the different shrinkage properties of stretch films.

1. Aluminized transmission occurs when aluminizing, and coating moves when applying glue. The main measure to prevent corona on the back of the stretched film is to adjust the pressure of the rubber squeeze roller in front of the corona treatment roller and the pressure at both ends of the squeeze roller. It must be consistent, and the pressure must be appropriate.

2. Polyester is a polar compound with high surface free performance, and the surface wetting tension is more than 40 factors/cm. However, for high-speed color printing, or in order to improve the bonding force between the vacuum aluminized layer and the surface of the stretched film, the surface treatment of the stretched film also needs to further increase the surface wet tension.

3. Non-polar polymer, the surface free energy of the film is small, and the surface wet tension is low, generally about 30 factors/cm. In theory, if the surface tension of the object is lower than 30 factors/cm, ordinary ink or sticky The mixture cannot adhere firmly, and its surface must be treated.

The above is about the related knowledge that affects the stretch film relaxation. If you want to know more about the stretch film, you can follow our website. If you have any questions, please feel free to contact us.

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Sha hu kou district,Changping Town,Dongguan,PRC

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