During the bag making process, the bag making machine needs a heat sealing temperature, and its function is to heat the adhesive film layer to a more ideal viscous 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 number of times of heat-sealing pressing, and the size of the heat-sealing area. If the number of times of hot pressing of the consent part increases, the temperature can be appropriately lowered. If the heat sealing area is increased, the heat sealing temperature can be increased.
During the bag making process, the heat-sealing strength is affected by the heat-sealing temperature. The higher the heat-sealing temperature, the heat-sealing strength will increase, but the heat-sealing strength will not change when the temperature upper limit is reached. Too high heat-sealing temperature will damage the heat-sealing material at the welding place, reduce the heat-sealing strength of the seal and the impact resistance of the bag. 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.