Bubbles ( Or Steelyard balance : stranded gas)
Description
If melt temperature contains gases (volatile compounds), then packing disappears in the injection molded parts also contain air bubbles
Preview
Causes
| Possible causes | Suggested solution |
|---|
| Injection molding machine |
1.Trapped in the injection of air in the cylinder. |
Reduced melt temperature, particularly the latter.
|
|
Increase back pressure.
|
|
2.Mold filling speed is too fast.
|
Reduce the speed of the screw, and reduce cable volume.
|
|
Reduce the injection speed.
|
|
Increase injection pressure.
|
|
3.Fill pressure insufficient
|
Increase injection speed.
|
|
On the injection molding machine remains stable bedding.
|
| Mold |
1. Mold exhausting not enough. |
Inserted in mould venting or expand existing vent depth.
|
2. Plastic flow in the mold of uneven air trapped in it.
|
Using vacuum exhaust method on the die.
|
|
Change the location of the gate.
|
|
Runner diameter increase.
|
| Plastic |
Workshop of plastic into the warm air moisture condenses on the cold plastic. |
Drying of plastic.
|
|
Put plastic factory for at least six hours before injection.
|
|
