The strength of the external tension of stretch film depends on the size of the free energy of the film, and the function of the film depends on the molecular structure of the film itself. There are many factors that affect the tension of stretch film, so what are the main factors that affect the tension of stretch film? The following stretch film manufacturers to do a detailed answer for you, the details are as follows.

1. non-polar polymer, stretch film appearance free energy is small, the appearance of the wet tension is low, generally about 30 dynes / cm. Theoretically speaking, if the external tension of the object is lower than 33 dynes/cm, ordinary ink or adhesive will not be able to adhere firmly, so the surface treatment is necessary.

 

2. Transfer of the aluminized layer occurs when aluminizing, and transfer of the coated layer occurs when gluing. The main measure to prevent the reverse side of the stretch film is to adjust the pressure of the rubber compression roller in front of the power treatment roller, the pressure at both ends of the compression roller should be consistent and the pressure size should be appropriate.

 

3. polyester class is a polar polymer, its appearance of free energy is high, stretch film appearance of wet tension in more than 40 dyne/cm. But for high-speed black printing or to increase the bond between the vacuum aluminizing layer and BOPET film appearance, also need to BOPET film appearance disposal, in order to further improve its appearance wet tension.