Heat sealing process: the quality cornerstone of three-side-seal bag making machine

The three-side-seal bag making machine seals the three sides of the plastic film through the heat sealing process to form an independent packaging bag. The quality of the three-side-seal bag making machine directly affects the shelf life, transportation safety and consumer experience of the packaged products. The accuracy and reliability of the heat sealing process have become the key indicators for measuring the performance of the three-side-seal bag making machine. ​
Heating principle of advanced heat sealing technology
The three-side-seal bag making machine adopts advanced heat sealing technology. Common heating methods include electric heating and infrared heating. Electric heating uses the principle of heat generated by electric current passing through resistance to convert electrical energy into thermal energy, so that the heating plate heats up quickly; infrared heating is based on the thermal effect of infrared rays, and infrared radiation directly acts on the surface of the film to achieve rapid heating.
Precise adjustment of intelligent temperature control system
Temperature control is a key link in the heat sealing process. The three-side-seal bag making machine is equipped with an intelligent temperature control system. Plastic films of different materials have different melting points, and their thermal stability and melting characteristics are significantly different, so different heat sealing temperatures need to be set. The temperature control system can automatically and accurately adjust the temperature of the heating plate according to the characteristics of the film material, ensuring that during the heat sealing process, the film surface can reach a molten state, and will not be degraded or deformed due to excessive temperature, thereby ensuring the stability and consistency of the heat sealing quality. ​
Cooperative operation mechanism of the heat sealing process​
During the heat sealing process, the various components of the three-side-seal bag making machine work together. When the heating plate reaches the preset temperature, it contacts the film briefly, and the heat is quickly transferred to the surface of the film to melt it. The pressure mechanism applies pressure synchronously. Under the action of pressure, the molecules of the two layers of molten film diffuse and penetrate each other to achieve tight fusion. This process has strict requirements on contact time and pressure. Only by accurately controlling each parameter can a firm and sealed seal be formed. ​
Important guarantee of heat sealing quality​
After the heat sealing is completed, the cooling device immediately takes effect to quickly cool and shape the heat sealing part. During the cooling process of the film melted at high temperature, the molecular structure is rearranged and solidified to form a stable sealing structure. If the cooling is not timely or the cooling effect is poor, the sealing part may be deformed and wrinkled due to excessive temperature, affecting the appearance and sealing of the packaging bag. The efficient cooling device can quickly reduce the temperature of the heat-sealed part, so that it can be shaped in a short time, effectively avoiding the above problems and further improving the quality of bag making. The excellent performance of the heat sealing process makes the three-side-seal bag making machine stand out in the packaging market. With precise temperature control, efficient heating method, coordinated heat sealing process and reliable cooling and shaping, the three-side-seal bag making machine can produce packaging bags with stable quality and strong sealing, which are widely used in food, medicine, daily chemicals and other industries.