In the process of bag making, the bag making machine needs a heat sealing temperature. Its function is to heat the adhesive film to an ideal viscous flow state. When selecting the heat sealing temperature, it needs to be comprehensively considered according to the characteristics of the heat sealing material, the thickness of the film, the times of hot pressing and the size of the heat sealing area. If the pressing times of the agreed parts increase, the temperature can be appropriately reduced. If the heat sealing area increases, the heat sealing temperature can be increased.

During the bag making process of the bag making machine, the heat sealing strength is affected by the heat sealing temperature. The higher the heat sealing temperature, the heat sealing strength will increase, but when the upper temperature limit is reached, the heat sealing strength will not change. If the heat sealing temperature is too high, the heat sealing material at the welding joint will be damaged, and the heat sealing strength of the seal and the impact resistance of the bag will be reduced. Therefore, the heat sealing temperature should be higher than the melting temperature of the heat sealing material, and the temperature should not be too high.