There are two cooling methods for laboratory small film blower: external cooling and internal cooling.
External cooling is achieved directly through the heat dissipation of membrane bubbles. Because the velocity of air in the bubble is relatively low and there is no regularity, the external cooling is more advantageous.
External cooling is the earliest method of application. Under the action of the cooling ring, uniform cooling air around the ring is produced by releasing cooling air through a circular ring along the extrusion direction and on the outer surface of the bubble. Inside the cooling ring, the upper air is expelled at a faster average speed than the lower air. It ensures that the shape of the bubble is consistent with that of the air cooling ring, which increases the average velocity of air flow and consequently improves the heat transfer.
