We all know that the wrapping film is mainly used in the packaging industry. Regardless of the shape and size of the item, the wrapping film can play a good role with its special features and advantages, but some users find the item when transporting the item. There are scattered phenomena, find the reason, it turns out that the wrapping film itself has changed, and the tightness of the wrapping film has been reduced a lot, which has caused the packaging to be too loose, so what factors affect the tightness of the wrapping film Woolen cloth?
1. Polyesters (PET, PBT, PEN, PETG) are polar polymers with high surface free energy and surface wet tension above 40 dynes/cm. However, for high-speed color printing or to increase the bonding force between the vacuum aluminized layer and the surface of the BOPET film, surface treatment of the BOPET film is also required to further improve its surface wet tension;
2. Non-polar polymers, the surface free energy of the wrapping film is small, and the surface wet tension is low, generally about 30 dynes/cm. Theoretically, if the surface tension of the object is lower than 33 dynes/cm, ordinary inks or adhesives will not be able to adhere firmly, so the surface must be treated;
3. The transfer of the aluminized layer will occur when aluminized, and the transfer of the coated layer will occur when the glue is applied. The main measure to prevent corona on the reverse side of the wrapping film is to adjust the pressure of the rubber pinch roller in front of the corona treatment roller. The pressure at both ends of the pinch roller should be consistent and the pressure should be appropriate.
In fact, in the process of producing the
Stretch Film, there is also the problem of too looseness. We can know from the answers of professionals that the tightness of the surface of the stretch film depends on the molecular structure of the film material itself, and the surface free energy of the stretch film The size of the film determines whether the wrapping film has a good tightness. Therefore, all aspects of the performance of the stretch film are related to each other, so whether during the production or use of the stretch film, the relevant operations must be carried out in accordance with the regulations, and more precautions must be understood.
What factors may affect the tightness of the stretch film? We will introduce this issue to you today, the content is for your reference only! If you want to know more about the stretch film, please pay attention to this website, we will Regularly updated; if you want to know the wholesale price of stretch film, please come to the information consultation!
