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A successful hot runner mold application project requires multiple links to be guaranteed.
Nov 29, 2018

A successful hot runner mold application project requires multiple links to be guaranteed. The most important of these are two technical factors. One is the control of plastic temperature, and the other is the control of plastic flow.

Plastic temperature control

The control of plastic temperature is extremely important in hot runner mold applications. Processing and product quality that occurs during many production processes

The problem is directly due to the poor temperature control of the hot runner system. For example, when the hot pin gate method is used for injection molding, the quality of the product gate is poor, the valve gate method is difficult to close the valve needle during molding, and the filling time and quality of the parts in the multi-cavity mold are inconsistent. If possible, try to choose a hot runner system with multiple zones for temperature control to increase flexibility and resilience.

Plastic flow control

The plastic is to be flow balanced in the hot runner system. The gates should be opened at the same time to allow the plastic to fill the cavities simultaneously. For the FAMILY MOLD, where the weight of the parts is very different, the runner size design balance is required. Otherwise, some parts will not be filled with mold and pressure, and some parts will be over-filled and over-filled. The hot runner sprue size should be reasonable. The size is too small and the filling pressure loss is too large. If the size is too large, the hot runner volume is too large, and the plastic stays in the hot runner system for too long, which may damage the material properties and cause the parts to be unable to meet the requirements after molding. There are already CAE software in the world that help users to design the best runners, such as MOLDCAE.


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