What factors do the heat sealing temperature of bag making machine depend on?

Bag making machine equipment can make bags of different specifications. These bags are widely used in food and chemical industry. When making bags, it needs appropriate temperature to make them shape. What is the heat sealing temperature of bag making machine? Is it related to bag making raw materials?

In the process of bag making, the bag making machine needs a heat sealing temperature, which is used 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.

In other words, if the pressing times of the same part increase, the temperature can be appropriately reduced; If the heat sealing area is increased, the heat sealing temperature can be increased. PVC plastic is a kind of amorphous polymer, so there is no fixed melting point, and there is only a melting temperature range, that is, a temperature range between solid phase and liquid phase.

When the bag making machine heats the PVC plastic to this temperature range, the film will enter the molten state, which is conducive to the forming of the bag. At this time, the upper and lower limits of the temperature range represent the decomposition temperature and viscous flow temperature of PVC respectively. The difference between them is the key to determine the difficulty of heat sealing.

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 at a certain temperature, 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.