The heat sealing of the packaging bag is to use external conditions (electric heating, high frequency voltage and ultrasonic waves, etc.) to make the sealing part of the plastic film into a viscous flow state, and the film is fused with the help of tool pressure, and maintains a certain strength after cooling. The three major factors of the heat sealing process are heat sealing temperature, pressure, time, and the main one is temperature. Different heat sealing conditions are required according to the material and the movement state of the material bag, and the three must be coordinated to obtain good heat sealing quality.
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