Material Drying
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Cooling water channel blockage of low density polyethylene injection mold
Problem Phenomenon
Mold cooling effect decreases, cooling time extends, and product demolding temperature rises.
Cooling water channel blockage causes poor local cooling, warpage, shrinkage voids and other defects in products, and reduced production efficiency.
Cause Analysis
(1) Poor cooling water quality; scale builds up on water channel inner walls and gradually blocks them
(2) Unreasonable water channel design; dead corners easily deposit impurities
(3) Long-term lack of cleaning and maintenance; rust or corrosion inside water channels
(4) Coolant temperature too low causing condensation; moisture mixes into water channels
(5) Water channel joint leakage; air enters forming air resistance
Solution
(1) Regularly clean cooling water channels; descale with chemical cleaning agent every 3-6 months
(2) Use soft water or pure water as cooling medium, add corrosion inhibitor
(3) Optimize water channel design, avoid dead corners and overly small channel diameters (≥8mm)
(4) Control coolant temperature 2-3°C above room temperature to prevent condensation
(5) Check water channel joint seals, ensure no leakage and air resistance
Key Takeaway
Water channel blockage is caused by poor water quality and insufficient maintenance; water channels need regular cleaning and cooling water quality needs improvement.
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