A significant hot runner benefit is the ability to locate the gate at various points on the part. With the utilization of hot tip gating, valve gating, or edge gating, hot runners enable the gate to be placed at the most favorable location for optimum filling and/or part aesthetics.
Fremont, CA: Though there would be a continuous need for cold runner molds, the advantages of using hot runner systems are so many that they are becoming popular in the choice for molds used in molding thermoplastics.
Let us look at some advantages of hot runner systems:
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Cycle Time Reduction
[vendor_logo_first]In multiple cases, the cold runner's weight is up to half the total shot weight and generally much thicker in section than the molded part wall thickness. Not using the cold runner can help reduce the cycle time since the thickest section controls cooling time. Besides, there would be more scope for cycle time savings in the injection screw recovery and injection times because of the smaller shot size.
Design Flexibility
A significant hot runner benefit is the ability to locate the gate at various points on the part. With the utilization of hot tip gating, valve gating, or edge gating, hot runners enable the gate to be placed at the most advantageous location for optimum filling and/or part aesthetics. This flexibility that hot runners give the part design also expands to the mold, where flexibility in gate location can help optimize cooling, cavity orientation, and mold simplification.
Improved Efficiency
Hot runner molds are usually easier to start since there are not any solidified runners to be removed after each under-filled shot until a complete mold shot is accomplished and automatic cycling can begin. In hot runner systems, the mold can run once the system reaches operating temperature. In addition, with hot runner systems, lower injection pressures can be used. This can reduce mold and platen deflection as well as keep flash caused by mold component movement to a minimum.
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