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1. Advantages of water over nitrogen
There are two reasons for replacing nitrogen with water for injection: the first is purely economic, the second more technical.
1.1 Economic aspect
Unlike nitrogen, which has disastrous heat exchange properties, water easily evacuates joules by conduction. As a result, we can expect to see a significant reduction in cycle times. In practice, on certain parts, we have been able to achieve a 50% reduction compared with gas-assisted injection.
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Comparison of the thermal conductivity of nitrogen and water :
nitrogen: k = 37.4 × 10 –3 W × m –1 × K –1...
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Advantages of water over nitrogen
General process principles
Patents
While the situation is complicated with gas-assisted injection molding, it's simple with water-assisted injection molding. In fact, the Institut fûr Kunststoffverarbeitung (IKV) in Aachen, Germany, has been working on this process since 1996, and published its findings in full in the April 1999 issue of Kunststoffe. This publication prevents patent applications from being filed in Europe, enabling the process to be promoted rather...
Bibliography
Manufacturers. Manufacturers
(non-exhaustive list)
Mixed power injection
PME fluidtec
TiK
Pressure control blowers
...
Organization
Institut für Kunstsoffverarbeitung (IKV)
Center de mise en forme des matériaux (Cemef), École des mines de Paris
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