12.4 Establishing Root Cause
This section is to be used as a reference tool only.
When a system that has been set up according to specification 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 tested and confirmed will produce
parts that meet design tolerances and specifications. 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.
12.4.1
Fault Identification
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 setup 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 following pages.
12-4
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