1. Internal cooling method, this method achieves cooling through film bubble heat dissipation. Because the air velocity inside the bubble is low and irregular, external cooling is preferred. In the blowing process of the bubble film machine, in order to ensure the quality of the film, it is necessary to consider the stability of the film bubble before the film is formed.
2. External cooling method, which is carried out through a cooling ring, which releases cooling gas through a circular ring along the extrusion direction and the outer surface of the film bubble. In this cooling ring, the air at the upper opening is relatively The lower port is discharged faster, which ensures that the shape of the film bubble is consistent with the air cooling ring, which increases the average flow rate of the air and improves the heat transfer.
