As a plastic packaging product for packaging food, its sealing technology determines the weight of the food and the safety and health of the food quality. Therefore, the sealing technology of food packaging is the basic skill of various plastic packaging product manufacturers, because although plastic bags have good chemical properties, plastic products are not resistant to high temperatures, so plastic packaging bags are sealed using heat sealing technology.Different plastic packaging bags have different heat-sealing properties. Food plastic packaging bags with high density and granular packaging require high heat-sealing strength of plastic packaging bags. When the heat-sealing material is determined, the heat-sealing quality is directly related to the heat-sealing process, and usually the main control is the heat-sealing temperature, pressure and time. When heat sealing is above the heat sealing temperature, the plastic film will become a viscous fluid state; while the heat sealing pressure will cause the interpenetration and diffusion of interpenetration and diffusion between the interface molecules of the plastic film in a viscous fluid state; a certain heat sealing time will Make the interface molecules of the plastic film penetrate and diffuse each other as soon as possible, so that the interface disappears and becomes a whole, so it has good sealing.The minimum heat-sealing temperature of the heat-sealing material depends on the melting temperature of the material. The heat-sealing temperature should be higher than the melting temperature of the heat-sealing material. However, the higher temperature depends on whether the material being sealed is a single film or a composite film, the thickness of the film, The impact of heat sealing pressure, heat sealing speed and other technical indicators. Generally, the heat-sealing pressure is high; the heat-sealing speed is slow; the film thickness is large, the heat-sealing temperature can be lower, and vice versa.