Cooling method of lab blown film machine
There are two types of cooling methods for small blown film machines: external cooling and internal cooling.
1. Internal cooling directly passes through the bubble to achieve cooling. Because the flow rate of air in the bubble is relatively low and there is no regularity, external cooling is dominant.
2. The external cooling method is the earliest application method. Under the action of the cooling ring, the cooling air is released through a circular ring along the extrusion direction and 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 relative to the lower port. It is ensured that the shape of the bubble is consistent with that of the air cooling ring, so that the average flow rate of the air is increased and thus the heat transfer is increased.
In the blow molding process of a small blown film machine, in order to ensure the quality of the film product, the stability of the film bubble must be considered before the film formation can be effectively controlled. The production of blown film for small blown film machines, in addition to the constraints of the bubble, also considers the blower cooling system. A complete cooling system requires reasonable configuration and stability of the blown film machine.
