Page 43 - Injection Molding Advanced Troubleshooting Guide
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2.17 Purging Compound 25
2.14 Thermal Imaging Camera
Costs of infrared thermal imaging cameras has come down to a level that is much
easier to justify. Use of a thermal imaging camera on parts will help provide an
accurate view of the “part out temperature” after the part is ejected from the mold.
These thermal images can be used to detect hot spots that may indicate cooling
issues. Thermal imaging of nozzle and barrel heaters can also indicate hot or cold
spots that should be addressed. Thermal imaging is a very useful tool to help with
cycle time optimization; in fact, the savings from this alone will justify the capital
investment in a camera.
2.15 Aluminum Tape
A quick check to determine if improved venting will solve a problem is to add alu-
minum tape to the parting line near the area of concern to allow for additional
venting. If this improves the issue the venting should be added or deepened.
See also Chapter 7, which covers venting.
2.16 Dial Indicator
A dial indicator on an adjustable arm can be used to check for mold deflection.
When troubleshooting flash, it is critical to know if the mold is being blown open
with injection pressure. Setting up a dial indicator and watching for movement can
usually prove if clamp tonnage is a root cause.
2.17 Purging Compound
When dealing with contamination-type defects, having a purging compound can
allow the barrel and machine to be cleaned out of contaminating resin and carbon
buildup (at least to a point).
