- A process that uses one injection speed to fill - whenever possible
- The mold fills 95 to 98 percent full during first stage
- All cavities are short shot during first stage
- First stage fill is velocity-controlled and not pressure limited
- Second stage pack is pressure-controller and not velocity limited
- Process uses only 20 to 80 percent of the machine’s available shot size
- The final cushion is approximately 10 percent of the overall shot size
Using Hold Pressure Velocity
I received this question from a frequent blog contributor, and believe it makes a good discussion on decoupled processes...
On some of our machines, we can adjust the hold velocity. How should this feature be used when molding a decoupled II process.
Before I respond, I want to relate the general attributes of this process:
Always make sure you understand the specific controls on your machines. In some cases, the 2nd stage velocity is actually a limit rather than an actual setting. In this case, you should set the speed near the maximum so that 2nd stage pack does not become velocity-limited.
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