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The colder the mold, the shorter the cycle?
The colder the mold, the shorter the cycle. A too low coolant temperature may not effectively shorten the cycle, and may even have negative effects. The appropriate mold temperature and turbulence state are the key factors in shortening the cycle.. The lower the coolant temperature, the better. Experience has shown that reducing the coolant temperature has limited practical effects, and cooling is usually only effective at specific low temperatures (such as 50 ° F), below which the cycle may not be further shortened. For example, the customer attempted to reduce the water temperature from 50 ° F to 32 ° F to shorten the cycle time of the eight chamber PVC component (from 22 seconds to 18 seconds), but did not provide data to support this hypothesis. Low coolant temperature may cause rapid cooling of the outer layer of the component, forming an insulation layer that hinders the dissipation of internal heat and instead prolongs the overall cooling time. The effect of turbulence on cooling efficiency. Turbulent states can significantly improve cooling efficiency. By using flow meters and Reynolds number (RN) calculations, it can be determined whether the coolant is in a turbulent state (RN>5000). If the coolant is laminar flow (RN<5000), the cooling effect will be greatly reduced if only the cooling pin keeps the temperature very low. In the experiment, the customer initially used a 50/50 mixture of water and ethylene glycol as the coolant, which had a kinematic viscosity three times that of water, resulting in a Reynolds number below 3100 and a laminar flow of the coolant. After replacing it with pure water, the flow rate increased from 1.3 GPM to 2.0 GPM, the ki
2. Research on Cooling in Injection Molding Process
Cooling research in injection molding process mainly focuses on mold temperature control, cooling circuit design, coolant selection, and pipeline layout. The following is a specific analysis: The importance of mold temperature control is to control