What is the role of POF shrink film punching?

What is the role of punching holes in POF shrink film? When we shrink a product on an automatic packaging machine, the gas inside cannot escape without punching holes, and the shrinking effect is easy to be broken. With punching holes, the shrinking effect will be better. Then we adjust the hole position and test the effect to make the product effect meet the shrinking requirements. We call this hole a breathable hole, which is also very important in shrinking products.

POF shrink film is thin and tough, with uniform thickness, good moisture resistance and soft texture. It has high tensile strength, high tear resistance and adjustable shrinkage. The POF shrink film does not produce moisture during processing and will not stick to the sealing rod, making it easy to maintain and operate. Its high toughness, smoothness and rubbing resistance make it suitable for automatic packaging on high-speed production lines. POF shrink film has a large shrinkage rate of up to 75%, good flexibility, and can be used to package products of any shape. In addition, the shrinkage force of the three-layer co-extruded film treated with special technology is controllable, meeting the shrinkage force requirements of different product packaging. A good POF shrink film must be tested at a high temperature of 500 degrees. It must be packaged under different temperatures to detect whether it is dissolved. If so, it proves that the product quality of the POF shrink film is not up to standard. If everything is normal, the POF shrink film can be put into use.

The appearance of the whole roll of POF shrink film is pure white. When the single layer is opened, it is transparent and shiny. It feels smooth and soft to the touch. It has excellent cold resistance. It is not hard or brittle at -50℃ and is not easy to break. It can be used for frozen food packaging. After shrink packaging, the packaged objects can be stored for a long time at -50℃--95℃ and remain stable. It has static electricity and anti-fog treatment, is not easy to be polluted by dust, and can keep the product clean and bright. In order to ensure the heat sealing strength of plastic composite flexible packaging, a certain heat sealing pressure is essential. Therefore, the heat sealing pressure is required to be moderate and uniform during the heat sealing process.