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Detailed explanation of hot air public welfare of composite packaging bags

by:Supouches Packaging     2022-08-30
When the heat-sealing material is determined, the heat-sealing quality of the composite packaging bag is directly related to the heat-sealing process. Usually, the main control is the temperature, pressure and time of the heat-sealing. Heat sealing theory When the composite packaging bag is heat sealed, the plastic film becomes a viscous flow state when the heat sealing temperature is above; while the heat sealing pressure makes the interface molecules of the plastic film in the viscous flow state produce mutual penetration and diffusion external power; A certain heat sealing time will make the interface molecules of the plastic film penetrate and diffuse into each other as soon as possible, so that the interface disappears and becomes a whole, so it has good sealing performance. Heat-sealing temperature 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, how much higher than that depends on whether the material to be sealed is a single film or a composite film or a thin film. Thickness, 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. Heat sealing pressure The size of the heat sealing pressure also has a great influence on the heat sealing effect. The heat sealing pressure should be appropriate. When the heat sealing pressure is too low, it is difficult for the two layers of materials to be heat sealed to achieve true fusion, or it is difficult to catch up with the middle of the sealing. gas, so as to cause partial leakage. The heat sealing pressure is too large, and when the heat sealing temperature is slightly higher, the heat sealing knife will easily squeeze the melt in the sealing seam during heat sealing, resulting in“eager”Phenomenon. Lightly reduce the heat sealing strength of the seal and reduce the impact strength of the seal. Generally, the heat sealing temperature is high; the heat sealing speed is slow; the thinner the film material, the smaller the heat sealing pressure, and vice versa. Heat-sealing time Under the same heat-sealing temperature and heat-sealing pressure, the longer the heat-sealing time is, the stronger the interface of the heat-sealing layer is. Effect. At the same time, if the heat sealing time is too long, it is easy to cause wrinkling and deformation of the sealing seam, affecting the appearance and causing leakage of the bag. In conclusion, the characteristics of heat-sealing materials are different due to different heat-sealing materials, adding different additives, and different treatment methods (corona, printing) for composite packaging bags of heat-sealing materials. Careful selection should be made according to different packaged objects and packaging processes. Temperature, pressure and time are three important parameters to determine the heat sealing process, which should be properly determined according to the different heat sealing materials and packaging processes of the composite packaging bag to obtain the best heat sealing effect.
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