Packing/holding profiles are used during the packing and holding phases to reduce defects in the part due to uneven shrinkage, warpage, and overpacking.
Filling profiles are used during the molding cycle until the velocity/pressure switchover point has been reached. Pressure profiles then begin.
You can use a constant profile or a linear profile.
Following are three examples packing profiles, the tables below each profile provides the values used to achieve them.
<embed src="../attachments/GUID-8C10911F-2FE2-49C4-8BC6-90E184E3A152-low.svg" pluginspage="http://www.adobe.com/svg/viewer/install/"/>| Duration (sec) | Pressure (MPa) |
|---|---|
| 0 | 20 |
| 8 | 20 |
| 0 | 0 |
| Duration (sec) | Pressure (MPa) |
|---|---|
| 0 | 20 |
| 5 | 20 |
| 3 | 0 |
Example 3. % Maximum machine pressure vs time (linear profile)
<embed src="../attachments/GUID-C6089DF8-1C6E-4198-87B9-88F9CC732C3F-low.svg" pluginspage="http://www.adobe.com/svg/viewer/install/"/>| Duration (sec) | Pressure (%) |
|---|---|
| 0 | 60 |
| 5 | 60 |
| 3 | 0 |