The film blowing machine produces films suitable for various high-end film packaging. This film can be widely used in light and heavy packaging due to its good barrier properties, freshness, moisture, frost, oxygen, and oil resistance. Such as various fresh fruits, meat products, pickles, fresh milk, liquid beverages, medical supplies, etc. Plastic film blowing machine cooling methods can be divided into two types: external cooling and internal cooling.

      1. The external cooling method is the earliest application method. Under the action of the cooling ring, a uniform cooling air around the ring is generated by releasing the cooling air on a circular ring along the extrusion direction and on the outer surface of the bubble. Inside the cooling ring, the air at the upper port is expelled at a faster average speed than at the lower port. It is ensured that the shape of the film bubble is consistent with that of the air cooling ring, so that the average flow velocity of the air is increased and thus the heat transfer is improved.

      2. The internal cooling directly dissipates heat through the film bubble for cooling purposes. Because the flow rate of air in the bubble is relatively low and there is no regularity, external cooling is dominant. In the blow molding process of the film blowing machine, to ensure the quality of the film product, the stability of the film bubble before the film formation must be considered to effectively control the product qualification rate. The output of blown film by the blown film machine is not only restricted by the film bubble, but also the cooling system of the blown film machine. A perfect cooling system requires reasonable configuration and stability of the film blowing machine.
 

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