Plastic degradation
Description
Injection molded parts or certain parts of injection molded parts usually changed color in the degradation, color from yellow to black..
Preview
Causes
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Possible causes
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Suggested solution
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| Injection molding machine |
In cylinder of injection plastic too heated.
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Reduced melt temperature.
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Temperature controller is not functioning properly.
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Check injection cylinder controlled by temperature controller is in the correct area.
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More positive temperature controller and check again whether there is a contact adhesive.
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Using an incorrect thermocouple types.
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Check whether the types of thermocouples used or available on temperature controller, such as FeCon consistent.
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Check whether all electric running with satisfaction.
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Plastic injection cylinders in the residence time is too long.
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Injection weight, if it is less than the injection pressure of injection molding machine 25%, the mold will transfer to the smaller plastic injection molding machine.
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If there are no smaller injection molding machine can be used for the injection cylinder temperature dropped below the minimum value, which will meet the quality requirements of injection molded parts.
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At the time of cessation of the production of plastic stuck in cylinder of injection.
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When you stop the production, to clean up the shot cylinder, screw the most forward position.
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Somewhere in the plastic injection tank "stranded" and degradation.
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Check shot cylinder, removal of land of any residual stains.
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| Mold |
Mold shot is too small. |
The mold is moved to the smaller of the injection molding machine.
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Plastic
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Water content in the plastic is too high.
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Use the correct baking programs.
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