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Possible causes
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Recommendations to resolve
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Injection molding machine
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1.The melting temperature is too high or too low.
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1.Adjust the injection cylinder temperatures.
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2.Adjust the screw speed to get the correct surface speed.
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2.Insufficient plastic in cavity.
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1.Increase the amount of plastic injection molding.
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2.Ensure proper bedding.
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3.Increase the screw forward time.
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4.Increase the injection pressure.
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5.Increase the injection speed.
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6.Check that the valve is installed properly.
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7.Because of abnormal operation may cause pressure loss.
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3.Plastic surface is overheated in cooling stage.
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Lower mold surface temperature.
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Mold
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1.Feed system is too small.
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Increase the size of runner diameter and gate. (Depth, width and length).
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2.Injection molded parts's temperature is too hot.
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1.Increased the cooldown.
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2.Immersion in warm water immediately after crest, cooling of injection molded parts
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3.Product's walls are too thick or large disproportionate.
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1.Use thinner and more uniform wall to redesign the injection molded parts.
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2.Position the gate in injection parts on the most thick-walled parts.
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4.Lack of mold cooling pipes.
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1.Blank the thick molds if possible.
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2.Insert additional cooling pipes inside the mould and thin core / Add thermal Rod rods.
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