Several factors affecting the heat sealing strength of POF heat shrinkable film

With the rapid development of food, cosmetics, medicine and other industries, the demand for plastic composite packaging products is increasing, and the quality requirements for plastic composite packaging products are getting higher and higher. Packaging users not only pay attention to the beauty and logistics performance of the packaged products, but also pay attention to the heat seal strength of the packaged products. Because the heat seal strength of packaged products directly affects packaging speed, transportation and sales. In actual production, each POF heat shrinkable manufacturer regards heat seal strength as the most important quality index to control whether it is for bag-making products or coil products used in automatic packaging production lines. The following is a simple analysis of the factors that affect the heat sealing strength of the heat shrinkable film based on the actual production experience: ① Heat sealing temperature: Heat sealing temperature directly affects the heat sealing strength of plastic composite packaging products. ②Heat-sealing time: The heat-sealing time of automatic packaging machine or old bag making machine is determined by machine speed. When the heat-sealing temperature and heat-sealing pressure remain unchanged, the longer the heat-sealing time, the stronger the bond between the heat-sealing layers. However, if the heat-sealing time is too long, the heat-sealed part of the composite film will appear wrinkles and unevenness, which will seriously affect the appearance quality of the product. ③Heat sealing pressure: 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. If the heat sealing pressure is not enough or uneven, air bubbles will be generated in the heat sealing part and false welding will result in poor heat sealing. Heat shrinkable film | How to detect the heat treatment of POF shrink film, processing and application of heat shrinkable film