|
Possible cause
|
Recommendations to resolve
|
|---|
|
Injection molding machine
|
1. Cold material in the nozzle.
|
1. Check the nozzle installation to see if its dripping.
|
|
2. Increase the jet nozzle temperature.
|
|
3. If using closed fire mouth, check that it is operating correctly.
|
|
4. Nozzle back taper allows the separation of plastic and mold.
|
|
2.Melt temperature is too low.
|
Increase melt temperature.
|
|
3. Injection molded parts are not fully populated.
|
1.Increase the injection moulding of plastic injection molding machine.
|
|
2.Increase injection pressure.
|
|
4.Clamping force is not sufficient for use in molding surface.
|
Increasing effective clamping force.
|
|
Mold
|
1.Without prior establishment of cold material points.
|
Opposite the note process a plastic plug or deepen existing plastic plug.
|
|
2.Mold temperature too low.
|
Increase the mold temperature.
|
|
3.Plastic rapid changes in flow direction.
|
In any place in the mold to avoid sharp edges.
|
|
4.The spiral cavity (mixed plastics more obvious).
|
Increasing the diameter of the gate or gate with slice types.
|
|
5.Use release agent.
|
Avoid the use of release agents.
|
|
6. In the gate area, bad cold material by hot runner device due to rough surfaces.
|
With elevated temperature or correct nozzle improved hot runner injection nozzle.
|
|
Plastic
|
Plastic contains extra lubricants or other processing auxiliary.
|
Test the same plastic to identify whether its a faulty good.
|
