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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 sprue bushing is not aligned with the nozzle.
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Re-link muzzle and nozzle.
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2.Inner plastic packing too much.
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1.Lower the injection pressure.
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2.Reduce the screw forward time.
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3.Jet nozzle temperature is too low.
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Increased the jet nozzle temperature or heating an independent temperature controller.
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4.Plastic injection is not fully cured, especially large diameter pouring sprue.
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Increase the cooling time, but the better way is to use a smaller mouth note instead of the original.
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Mold
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1.Sprue bushing hole's diameter appearing hair.
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Check if any burr, which may lead to depression. The reason of burr is sprue bushing area and noozle area have an incorrect RADIUS .
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2.Nozzle is incorrect.
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Rework the process of nozzle so that it has the correct RADIUS (typically 0.55m larger than the RADIUS of noozle).
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3.Nozzle's diameter larger than the sprue aperture.
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Install a new shoot the mouth or smaller aperture to increase injection sleeve bore diameter.
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4.Sprue bushing lack of taper.
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Increase the angle of the sleeve at 3 to 5 degrees.
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5.Improper use of injection needles.
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Check if you are using the correct type of injection needle. Wherever possible, use the inverted cone design of the injection needle or "z"-shaped needle, check the "z"-type needle is in the top-left mold in the process, "z" corner of the needle or the runner and note precede circle alone.
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6.Poor surface accuracy.
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Polishing internal surfaces.
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7.Sprue bushing's diameter is too small.
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Increase the diameter of mouth.
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