Manufacturer of stretch film introduces the surface treatment method of stretch film for you:

Manufacturer of stretch film introduces the surface treatment method of stretch film for you:

The surface treatment methods of stretch film include corona treatment, chemical treatment, mechanical shearing, coating, etc. The most commonly used method is corona treatment.

Corona treatment method, the basic principle is: through the metal electrode and corona treatment roller (generally for high temperature resistant, resistant to ozone, high insulating silicone rubber roller) between high frequency, high voltage power supply, make it produce discharge, so the air ionization and forms a large amount of ozone. At the same time, high energy electric spark impinge on the film surface. Under their combined action, stretch film surface produces activation, surface can increase. The wet tension of stretch film can be increased to 38 dyne/cm by corona treatment. The surface wet tension of polyester film can reach over 52-56 dyne/cm. The wet tension of corona treatment stretch film surface is related to the voltage applied to the electrode, the distance between electrode and corona treatment roller and other factors. Of course, corona treatment should be appropriate, not corona treatment intensity higher the better. It is worth noting that the air between the stretch film and the corona treatment roller should be avoided, otherwise the reverse side of the stretch film may also be corona treatment. The adverse corona caused by: 1 May produce ink printing anti - adhesion phenomenon; 2. During aluminum plating, aluminum plating layer transfer will occur, and glue coating layer transfer will occur. The main measure to prevent corona on the reverse side of stretch film is to adjust the pressure of the rubber press roller before corona treatment. The pressure at both ends of the press roller should be consistent and the pressure should be appropriate. In addition, the corona roller and pressure roller must be strict of dynamic and static balance test, radial runout requires less than 0.05 mm, the purpose is to ensure that stretch film evenly into the corona roll, prevent clip into the air, thereby avoiding the phenomenon of negative corona.

JiNing HongXiang Packing Material Co.,Ltd