Rockwell Automation 1771-QDC, D17716.5.93(Passport) PLASTIC MOLDING MODULE User Manual
Page 15
Overview of Inject, Clamp, and Eject Mode
Chapter 1
1-3
Example Benefits of Profiling an Injection Phase
The injection phase should force the melt through the mold as fast as
possible without flashing the mold or burning the melt at a mold gate.
Here are two examples of how you can achieve this by profiling the
injection phase:
Velocity Example - As the leading edge of the melt enters different mold
cavities, the flow of plastic through the gate should increase or decrease
accordingly to keep the melt front at maximum desired speed without
flashing the mold. This reduces injection time and minimizes surface
stress due to surface cooling. You achieve this by shaping the injection
profile to suit the mold cavity (Figure 1.3).
Figure 1.3
Velocity Example
Mold Cavity
5
4
3
2
1
Flow into mold
1
2
3
4
5
Position
Sequence of execution
Back
Point
Mold
End
Injection Profile
Velocity
Gate