Production & Quality
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Declining Cooling System Efficiency of High-Density Polyethylene Extruder
Problem Phenomenon
The product is insufficiently cooled, and the temperature is still high after exiting the cooling water tank, affecting the sizing effect and subsequent cutting.
Declining cooling efficiency leads to reduced production speed or product deformation.
Cause Analysis
（1）The cooling water flow is insufficient or the water pressure is low
（2）The cooling water temperature is too high
（3）The cooling water channels are scaled and blocked
（4）The cooling water tank length is insufficient
（5）The product wall thickness is large and the heat dissipation is slow
Solution
（1）Check the cooling water pump and water pipes to ensure sufficient flow and water pressure
（2）Add a cooling water temperature reduction device (water chiller), and control the water temperature at 15-25°C
（3）Regularly clean the cooling water channels and cooling water tank to remove scale
（4）Increase the cooling water tank length or add cooling stations
（5）For thick-walled products, appropriately reduce the extrusion speed and extend the cooling time
Key Takeaway
Declining cooling efficiency is caused by insufficient water volume or excessive water temperature, and the cooling system needs to be improved and the water temperature controlled.
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