Hi there im new on here, some good info around. currently training in injection molding at moment and have a quizz with our course that I thought was good for anyone learning, it helped me. give it your best shot, answer away


A process is set up correctly. The melt cushion is 4mm. Some changes are to be made, in each case the process is reset to the start point before the next change is made. What will happen the melt cushion (guess what the new cushion will be in mm) if:

1. Shot size changed from 21 to 22mm
2. Injection Speed ...25 to 50mm/sec
3. Switchover... 10-11mm
4. RPM speed ...150-250RPM
5. Back Pressure ...5-10 bar
6. Decompression distance ...4-8mm
7. Injection Pressure ... 115 to 135 Bar
8. Injection Time ...3 to 5 sec.
9. Holding Time ...4-6 sec
10. Holding Pressure ...20-30 bar