The heat sealing temperature has a very important influence on the heat sealing strength, and the film thickness in the heat sealing layer plays a decisive role in the heat sealing effect.

1. When the temperature is relatively low, the surface of the heat seal layer is melted, and the thickness of the film participating in the heat seal is relatively thin, resulting in a low contact temperature.

2. When the temperature is too high, it may melt the heat seal film or cause the heat seal layer to peel off the base layer, leading to the base layer of the upper and lower films participating in the heat seal, which will inevitably lead to the decrease of the heat seal strength. Therefore, when we conduct film heat sealing, we must select a suitable heat sealing temperature, which cannot be too high or too low.