Material Drying
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Cooling Water Channel Blockage of Polypropylene Injection Mold
Fenómeno del problema
The cooling effect of the mold decreases, the cooling time is prolonged, and the demolding temperature of the product rises.
Cooling water channel blockage causes poor local cooling, the product shows defects such as warpage and shrinkage cavities, and production efficiency decreases.
Análisis de la causa
(1) The cooling water quality is poor, and scale gradually forms on the inner wall of the water channel and blocks it
(2) The water channel design is unreasonable, with dead corners where impurities easily deposit
(3) It has not been cleaned and maintained for a long time, and the water channel is rusted or corroded
(4) The coolant temperature is too low, causing condensation, and moisture mixes into the water channel
(5) The water channel joints leak, and air enters to form air resistance
Solución
(1) Regularly clean the cooling water channels, descaling with a chemical cleaning agent every 3-6 months
(2) Use soft water or pure water as the cooling medium, and add a preservative
(3) Optimize the water channel design, avoiding dead corners and excessively small channel diameters (≥8mm)
(4) Control the coolant temperature to be 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 resistance
Conclusión clave
Water channel blockage is caused by poor water quality and insufficient maintenance; the water channels need to be cleaned regularly and the cooling water quality improved.
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