When producing stand up pouches, controlling heat sealing temperature and pressure is a key step to ensure heat sealing quality and avoid poor heat sealing.
First of all, it is necessary to clarify that heat sealing temperature, pressure and time are the three main process parameters in the heat sealing process, which restrict and influence each other. When producing stand up pouches, a reasonable heat sealing temperature should be set according to the material, thickness and heat sealing requirements of the stand up pouch. Usually, the melting point of the heat sealing layer is low, so the heat sealing temperature should be controlled within the range that melts the resin of the heat sealing layer, while avoiding the melting of the resin of the composite layer.
Secondly, the control of heat sealing pressure is equally important. Appropriate heat sealing pressure helps the molecular chains of the heat sealing layer to penetrate and diffuse each other after melting, forming a strong heat sealing bond. Insufficient pressure will lead to a weak heat seal, while excessive pressure may damage the film material of the stand up pouch. Therefore, the pressure of the heat sealing knife should be adjusted according to the material and thickness of the stand up pouch to ensure the heat sealing quality.
During the heat sealing process, attention should also be paid to the control of the heat sealing time. The length of the heat sealing time depends on the heat sealing temperature and pressure, as well as the moving speed of the stand up pouch. After setting the heat sealing temperature and pressure, the heat sealing time should be adjusted according to the production speed of the stand up pouch to ensure that the heat sealing part is fully heated and pressurized.
In addition, in order to ensure the stability of the heat sealing quality, the heat sealing equipment should be maintained and calibrated regularly. Check the wear of the heat sealing knife and replace the severely worn heat sealing knife in time; clean the heat sealing knife and heat sealing mold to avoid impurities and dirt affecting the heat sealing quality.
At the same time, operators should receive professional training and master the operation methods and precautions of the heat sealing equipment. During the heat sealing process, operators should pay close attention to the heat sealing quality and promptly discover and solve the problem of poor heat sealing.
In addition, the temperature and humidity of the heat sealing environment may also affect the heat sealing quality. Therefore, when producing stand up pouches, the temperature and humidity of the heat sealing environment should be controlled to ensure the stability of the heat sealing quality.
Controlling the heat sealing temperature and pressure is the key to avoiding poor heat sealing of stand up pouches. The heat sealing quality of stand up pouches can be ensured by setting reasonable heat sealing parameters, regularly maintaining equipment, training operators, and controlling the heat sealing environment.
