13
2022
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07
Influence of plastic temperature and flow on hot runner mold
A successful hot runner mold application project requires multiple links to ensure it. The most important of which are two technical factors: one is the control of the temperature of the plastic, and the other is the control of the flow of the plastic.
1. Control of plastic temperature
Control of plastic temperature is extremely important in hot runner mold applications. Many processing and product quality problems in the production process directly stem from the poor temperature control of the hot runner system. For example, the problem of poor product gate quality when using the hot pin gate method for injection molding, the difficulty in closing the valve pin when the valve gate method is used, and the inconsistency of the filling time and quality of parts in multi-cavity molds. If possible, a hot runner system with multi-zone temperature control should be selected as far as possible to increase the flexibility and adaptability of use. 2. Control of plastic flow.
Plastic flow balance in the hot runner system. The gates should be opened at the same time so that the plastic fills each cavity synchronously. For the FAMILYMOLD with widely different parts weight, it is necessary to balance the runner size design. Otherwise, there will be problems such as insufficient mold filling and pressure retention for some parts, excessive mold filling and pressure retention for some parts, and poor quality due to excessive flash. The size design of the hot runner runner should be reasonable. If the size is too small, the pressure loss of the filling mold will be too large. If the size is too large, the volume of the hot runner will be too large. Requirements. There are already CAE software in the world such as MOLDCAE that help users to design the best runner.
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