20.2.3 Hardware
• Make sure the mold has been properly stored, and is dry, clean, free of
rust, dirt, moisture, residual resin, pigment and any protective coating.
• Check that the temperature controller meets requirements, and is fully
tested and operational.
• The injection molding machine has been properly maintained, cleaned,
lubricated; tolerances and dimensions veried.
• Make sure that the nozzles, cylinders, valves, gates, and any other
variable that is appropriate for the batch job has been chosen.
20.2.4 Settings
Ensure that all batch job parameters are correct:
• Temperatures
• Pressures
• Injection Speed
• Back Pressure
20.3 Establishing Root Cause
This section is to be used as a reference tool only.
When a system that has been set up according to specication and was
functioning normally suddenly produces sub-standard parts, the data in
the following pages may be used to determine the possible cause, but only
should be used as a guide.
A correct set up procedure that has been proven in will produce parts
that meet design tolerances and specications. A sudden change in any
parameter indicates a possible fault. Rather than modify other settings to
compensate for this variation, it is advisable to determine which of the original
settings has changed.
20.4 Fault Identication
The operator will need to evaluate all the possible conditions which may have
caused the defect.
• Identify the problem
• Determine the frequency
• Is the problem random or in the same location
• Review past history logs for similar occurrences and resolutions.
Review the machine settings to ensure that there is no variation from the
original set-up which was producing standard parts.
injection speed melt heating
screw speed locking
melt temperature cushion
back pressure mold heating
For a more thorough analysis of the defect, refer to the Troubleshooting
Section in the following pages.
20-3TROUBLESHOOTING
Hot Runner User Manual
© 2020 Mold-Masters (2007) Limited. All Rights Reserved.
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