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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.Injection speed is insufficient.
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Increase the injection speed.
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2.Shortage of plastic.
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1.Check the amount of plastic in the hopper.
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2.Check that you correctly set the injection stroke.
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3. Screw didn't leave a screw litter.
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Check valve for wear or cracks.
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4.Changes in operating hours.
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Check the operation is stable.
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5.Injection cylinder temperature is too low.
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1.Increase the melt temperature.
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2.Increase the back pressure.
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6.Injection speed is insufficient.
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Increase the injection speed.
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7. Nozzle part is sealed.
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Check the nozzle hole for foreign object or plastic.
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8.Nozzle or injection cylinder heater damage.
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Check the heater outer and check the energy output is correct.
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9.Injection time is too short.
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Increase the screw forward time.
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10.Plastic against the pipe wall and the hopper.
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Increase the cooling capacity of hopper throat area, or lower the the injection cylinder temperatures.
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11.Injection molding machine capacity is too small (that is, injections or weight plasticizing capacity).
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Use a large plastic injection molding machine.
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Mold
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1. Insufficient mold exhaust.
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Check the vent if its block or not.
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2. Insufficient mold filling.
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1.Increase the gate size or reduce the length of gate junction area.
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2. Add cold material to the runner to prevent non-plasticized plastic seal.
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Plastic
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1.Injection part wall is too thin, plastic cannot flow.
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Uselow viscosity (namely to flow more easily) plastic.
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2.Plastic flow's length is too large, plastic does not fill properly in injection molded parts.
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Change the location of the gate in order to reduce the length of plastic flow.
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