Hi @ktr.mech ,
Basically, how long the packing time could be depends on freeze off of part and gate.
If gate freeze off too soon, well, then packing has no longer an effect in part.
This is the main for packing time optimization.
There are a couple of more things to keep in mind though.
Have a look at this:
@mppkumar answers this very well in:
How to set a packing profile? Which I copied in below:
"Important results to check:
- volumetric shrinkage plot
- frozen layer fraction
- time to reach ejection temperature
- bulk temperature
Optimization:
1) Note down time at V/p switch over is done (T1)
2) identify gate freeze time thru frozen layer fraction result (T2)
3) Plot X-Y plot of pressure at end fill node - note peak pressure time (T3) and when pressure becomes zero (T4)
4) Calculate average (T5) of T3 & T4
5) Constant pressure time (T6)= T5-T1
6) Decay time (T7) = T2-T5
Set packing profile as below and run initial iteration
Time % Max. Injection Pressure
0 80%
T6 80%
T7 0%
If volumetric shrinkage is low near gate, decrease decay time (T7)
If volumetric shrinkage is high near gate, increase decay time (T7)
If higher volumetric shrinkage at end of fill regions , need to increase packing pressure and pressure time (T6)
If lower volumetric shrinkage at end of fill , try to decrease packing pressure and constant pressure time (T6)
for increasing packing time need to increase the gate size too"
On-line help:
Packing profiles
Pack Analysis Quick Start Tutorial
Hope this helps.
Regards,
Berndt
( If my comments are accepted, provide "Kudos" as appreciation. If your request is answered/resolved, please click the "Accept as Solution" button. Thanks.)
