The film blowing machine produces films suitable for various film packaging. This film is widely used in light and heavy packaging due to its good barrier properties, freshness, moisture, frost, oxygen and oil resistance. Such as a variety of fresh fruits, meat food, pickles, fresh milk, liquid drinks, medical supplies and so on. The cooling method of plastic film blowing machine can be divided into two types: external cooling and internal cooling.
1. The external cooling method is a very early application method. Under the action of the cooling ring, the cooling air is released through a circular ring in the extrusion direction and on the outer surface of the bubble to generate uniform cooling air around the ring. Inside the cooling ring, the air at the upper port is expelled at a faster average speed than the lower port. It is ensured that the shape of the membrane bubble is consistent with that of the air cooling ring, so that the average air flow velocity is increased and thus heat transfer is improved.
2. The internal cooling directly dissipates heat through the film bubble for cooling purpose. Because the air velocity in the bubble is relatively low and irregular, external cooling is more advantageous. During 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 needs to be considered to effectively control the product qualification rate. The output of blown film of blown film machine is not only restricted by film bubble, but also the cooling system of blown film machine. A perfect cooling system requires reasonable configuration and stability of the film blowing machine.
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