Injection Molding
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Cooling water channel blockage of general-purpose polyethylene injection mold
Problem Phenomenon
The mold cooling effect decreases, the cooling time is extended, and the demolding temperature of the product increases.
Cooling water channel blockage leads to poor local cooling, the product shows warpage, shrinkage cavities and other defects, and the production efficiency decreases.
Cause Analysis
（1）The cooling water quality is poor, and the inner wall of the water channel gradually scales and blocks
（2）The water channel design is unreasonable, and there are dead corners where impurities are easy to deposit
（3）No cleaning and maintenance for a long time, and the water channel is rusted or corroded
（4）The coolant temperature is too low, causing condensation, and water mixes into the water channel
（5）The water channel joints leak, and air enters to form air resistance
Solution
（1）Regularly clean the cooling water channels, and use chemical cleaning agents to remove scale 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 air resistance
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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