Page 225 - Injection Molding Advanced Troubleshooting Guide
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216 23 Contamination
Figure 23.5 Nozzle tips: general purpose, nylon, and full taper
23.3.3.2 Machine: Anti-seize
If people are conducting proper installation of new nozzles and nozzle tips they are
applying thread anti-seize molded onto the nozzle threads to prior to assembly. If
too much anti-seize is applied to the component it is possible to contaminate the
plastic melt stream with the anti-seize (see Figure 23.6, for example). Anti-seize
will usually result in dark streaks in the part.
Figure 23.6 Nozzle tip with excess anti-seize (top) and appropriate amount of anti-seize
( bottom)
