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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. Cylinder with a inequality plastic material.
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Check for adequate cooling water flow through the hopper throat in order to maintain the correct temperature.
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2.Cylinder's temperature fluctuation range is too large.
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1.Check whether there are inferior or even and loose electrical heating.
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2.Check with temperature controller used with electric heating is a correct type.
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3.Injection molding machine's capacity is too small.
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Check the injection and plasticizing capacity of plastic injection molding machine, and then compared with the actual quantity of injection moulding and plastics consumption per hour.
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4.Injection pressure instable.
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1.Ensure sstable melt bedding operation.
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2.Check the back flow valve for leaking, if there is a need for a replacement.
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3.Check for wrong feed settings.
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5.Screw restart instable.
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Make sure the operation screw at each recurrence position is stable, that is not more than 0.4mm(0.016in).
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6.Changes in operating hours, inconsistent melt viscosity.
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1.Check the operating hours for inconsistency.
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2.Using back pressure.
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Mold
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1.Some blocked gate.
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Check whether there are any indication of gate residues remain in the sprue hole, especially diving-gate |
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2.Inconsistent mould temperature control.
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1.Checks whether the cooling medium for mold cooling with temperature changes.
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2.Check the mould cooling pipe plug.
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3.Check the cooling pipes are properly linked.
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Plastic
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Plastic change.
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1.Check the feed size changes.
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2.Make sure the powder is sieve.
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3.Checks whether the two groups of plastic mixed.
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