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Possible causes
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Suggested solution
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| Injection molding machine |
1. Injection pressure is too great. |
1. Reduce injection pressure and injection pressure change to packing.
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2. Reduce time to screw moves forward.
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3. Reduce the injection speed.
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2. Too many plastic injection into molds.
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Reduce the injection capacity.
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| 3. Plastic is so hot. |
1. Reduce melt temperature.
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2. Reduce total cycle time.
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3. Reduce the injection speed.
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| 4. Intermittent pauses in the production run. |
When production stops, check the injection molding operation, especially melt temperature.
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| Mold |
1. Injection pressure within the mould is skewed. |
1. Cavity layout should be balanced.
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2. Check whether the injection part wall thickness on average.
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2. Become a prominent part in the mold surface.
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1. If cloak appears in the side of injection molded parts, check whether the land balance each other.
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2. Check mold junction area, where there is needed to clean.
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3. Then use blue ink check balance again.
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| 3. Injection molded parts in the mold or mold surface without registration. |
Open mould, a close-up view, repair and make correction to obtain balance padding mode.
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| 4. Projected area is too large. |
Total projected area of the mold (mold cavity and runner) for use of the clamping force is too big.
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5. Improper exhaust so plastic leaves the cavity area.
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1. Inspect and clean the vent.
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2. 0.0005in or 0.01mm expanded mold vent until the amount of increase will correctly fill the mold.
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