Fully Transient Cool Analysis

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Fully Transient Cool Analysis

As mentioned earlier, when the conventional cooling system is no longer for cooling function only, the cycle-average approach is not suitable any more. More specific, when system has a very long cycle time, e.g. optical lens development, or variotherm mold temperature control mechanism, it is necessary to use fully transient cool technique to analyze the full cycle behavior.

Users can evaluate what the difference between cycle average approach and fully transient method is. Next figure demonstrates that from cycle to cycle, the average part temperature will vary and gradually reach the steady state. If users apply the cycle average, it will underestimate the true part temperature.

 

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We can further investigate how Variotherm process affects this injection parts development. For example, below figure shows the injection parts with tiny features. Using conventional injection molding, it is very difficult to make the parts with sharp tiny features.

 

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 A micro injection molding using Variotherm process

 

After finishing the fully transient analysis, we can examine the temperature behaviors inside moldbase along time. During filling, Variotherm process will introduce much heat from steam. The inside temperature can be as high as 150°C as shown below. This will help the injection process to reach the sharp tiny features.

 

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Through the slicing function for moldbase with transient behavior, users can visualize the temperature conditions along any time period

 

In addition, when we trace the transient behavior of temperature with history curve, Variotherm process apparently introduces thermal effects into the system. Specifically, using conventional way, the average temperature of parts is about 25 ~ 30°C, while using Variotherm process it is varied to 25 ~ 163°C.  

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Through History curve investigation, users can realize how significant effects from Variotherm process