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Injection molding water cooling

The injection mold designing stage is the best time to place water in an injection mold but many of us have a shop full of molds that were designed by others and usually for slower cycles than expected today. Another part of the water flow equation as in the whole injection molding process is to find the water flow, injection mold temperature or BTU removal that works for your part. When part quality changes that should be one of the points to check before making adjustments to the process. The dynamics of water flow always wanting to follow the path of least resistance causes different water flow in the plant as injection molds are shut down, started up or changed. If the capacity of your cooling system changes so does the ability to remove heat or in some cases remove too much heat from the injection mold.

One of the things I find most frustrating is that when building multi cavity molds with independent circuits to each core/cavity, I find that the injection mold techs have jumped all the circuits together with a single in and out. When questioned they'll say... but I only have 2 in and 2 out circuits on the machine.

But at any rate, the objective is to maintain the recommended mold surface temperature, forget the water temperature!!!... mold surface temperate....within specs for the material with the least amount of temperate fluctuation during the cycle as possible. Each cavity temperate should be controlled to equal.

Generally experience will allow a good mold designer to see this visually. All too often we see people use waterlines diameters that are too small, or use jiffy plug series that are too small or use really small main fittings on their water manifolds. All these things reduce water flow, thus reducing how much heat you are able to draw away from the part surface.

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