Injection Phase
High pressure 1st Stage Boost - Depending on the area in which you live, you will hear a number of different terms used for this phase of the custom injection molding cycle. No matter what it is referred to as in your plant, it remains the same thing and serves the same purpose, and that is to inject melted plastic into your injection mold. This in many ways is the most important part of the basic injection molding cycle, as it has a great bearing on the initial cosmetics and size of your finished plastic injection molded product.
You can control the hydraulic pressure and speed with which you perform this phase, and on most newer machines the “fill” or “injection phase” can be broken down into 10 segments or more to aide in precise control of this part of your injection molding process. We will get deeper into the profile settings, what they are, and what you can do with them in the troubleshooting segment of this series. Under normal plastic processing conditions we want to fill the part as close to the 95 -99% full cavity range as we safely can, allowing for the natural resistance of the plastic to absorb the remaining inertia of the screw. When we reach the injection transfer or “cut-off” point setting, we are doing exactly what it sounds like and that is transferring from fi1stor 1st stage pressure, to pack/ho2ndor 2nd stage pressure.
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