What is the reason why pe film sticks to the knife when heat sealing?

The reason of sticking knife in pe film heat sealing is the high heat sealing temperature. According to the relevant public information, the existing film packaging machine can only package thicker films, but it can't realize heat sealing for thinner films such as PE and CPP. The main reason is that when the heat sealing temperature is high, it is easy to stick to the knife, that is, the film sticks to the heat sealing knife, and the packaging bag is damaged. When the temperature is low, it cannot be bonded, that is, it cannot be sealed. The main motor of the bag-making machine makes it run at a low speed, and then adjusts the edge position control to separate the film in the middle position; At the same time, the left and right pinch rollers of the bag-making machine should be adjusted to align the left and right films, and the front and rear pinch rollers should be adjusted to align the patterns.