Injection Molding
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Blockage of Cooling Water Channels in High-Density Polyethylene Injection Molds
Problem Phenomenon
The cooling effect of the mold decreases, the cooling time is extended, and the demolding temperature of the product increases.
Blockage of the cooling water channels leads to poor local cooling, defects such as warpage and shrinkage cavities in the product, and reduced production efficiency.
Cause Analysis
（1）The cooling water quality is poor, and scale gradually builds up on the inner wall of the water channels and blocks them
（2）The water channel design is unreasonable, with dead corners where impurities easily deposit
（3）No cleaning and maintenance for a long time, and the water channels rust or corrode
（4）The coolant temperature is too low, causing condensation, and water mixes into the water channels
（5）The water channel joints leak, and air enters to form air locks
Solution
（1）Regularly clean the cooling water channels, and descale with chemical cleaning agents every 3-6 months
（2）Use soft water or pure water as the cooling medium, and add preservatives
（3）Optimize the water channel design to avoid dead corners and excessively small channel diameters (≥8mm)
（4）Control the coolant temperature 2-3°C higher than room temperature to prevent condensation
（5）Check the sealing of the water channel joints to ensure no leakage and no air locks
Key Takeaway
Water channel blockage is caused by poor water quality and insufficient maintenance, and the water channels need to be cleaned regularly and the cooling water quality improved.
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