Problem Solutions - Injection
Problem: Incomplete filling

Too cold to melt and / or mold

1. Increase nozzle and sleeve temperatures

2. Increase mold temperature

3.Increase injection speed

4. Increase screw speed and back pressure

Heater (s) not working

1. Check thermocouple and heater bands

The amount of material injected

1. Increase the amount of material injected

2.Increase melt cushioning

Mold design

1. Check for clogging runner inlets.

2.Widen sprue entries

3.Widen the sprues

4. Check if the ventilation channels are blocked.

5.Widen the ventilation channels

6.Check the location of the ventilation ducts.

7.Add auxiliary vacuum to the ventilation ducts

Problem: Depress marks

The ironing pressure is too low

1. Increase the ironing pressure

Melt and / or mold is too hot

1. Reduce tip and sleeve temperatures

2. Reduce mold temperatures

3. Reduce the injection speed

Problem: Burning

Melt and / or mold is too hot

1. Reduce tip and sleeve temperatures

2. Reduce mold temperatures

3. Reduce the injection speed

Heater (s) faulty

1. Check thermocouple and temperature controls

Mold design

1.Widen the ventilation channels

2.Check if the ventilation ducts are blocked.

3.Add auxiliary vacuum to the ventilation ducts

4. Check the location of the ventilation ducts.

Problem: Odor and yellowing

Melt and / or mold is too hot

1. Reduce tip and sleeve temperatures

2. Reduce mold temperatures

3. Reduce the injection speed

4. Decrease screw speed and back pressure

5.Check the temperature controls of the hot runners (if used)

Problem: Material build up at the mold entrance

Moisture

1. Dry the granules

2.If you are using a dehumidifying auger, check what prevents dehumidification.

3.Add auxiliary vacuum to ventilation ducts

Problem: Burr formation

Injection pressure too high

1. Decrease the injection pressure

2. Increase the closing pressure

3. Reduce the injection speed

Melt and / or mold is too hot

1. Reduce tip and sleeve temperatures

2. Reduce mold temperatures

3.Reduce screw speed

Problem: Distortion of Part

Too much orientation (orientation)

1. Increase melt and mold temperature

2. Reduce the injection speed

The track is too compressed

1. Reduce the ironing pressure

2.Match the injection time and the mold filling time

Uneven mold filling

1. Change runner entry points

2. Make sure that the mold temperature does not change

3.Increase screw speed and back pressure

Problem: Sticking to the mold

The track is too hot

1. Reduce tip and sleeve temperatures

2. Reduce mold temperatures

3.Increase the cool down time

Mold design

1.Increase knoik angles

2.Use a release agent

Problem: Flow marks

Melt and / or mold too cold

1. Increase nozzle and sleeve temperatures

2. Increase mold temperature

3.Increase the injection speed

4. Increase screw speed and back pressure

Mold design

1. Change runner entry points

2.Expand the sprue entry

3.Extend the buff

Problem: Gaps

Melt is spinning too fast

1. Increase mold temperatures

2. Increase screw speed and back pressure

Moisture

1. Dry the warrants

2.If you are using a dehumidifying auger, check what prevents dehumidification.

3.Add auxiliary vacuum to the ventilation ducts

The ironing pressure is too low

1. Increase the ironing pressure