Dirt marks
Description
It usually related to the gate area: its surface is dark and sometimes the stripes appeared.
Preview
Causes
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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.
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Reduce the temperature of injection cylinder in the first two sections.
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2.Mold filling's speed is too fast.
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1.Reduce the injection speed.
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2.Lower the injection pressure.
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3.The temperature is too high.
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Reduce the mold temperature.
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Mold
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The gate signs of burning or additional process the rest of the area.
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Drop the gate area of rough, and polish it.
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Plastic
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Plastic viscosity is too low.
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Select the easy plastic flow.
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