Page 350 - Injection Molding Advanced Troubleshooting Guide

346 36 Part Sticking on Ejector

„ „36.2„ Part Sticking on Ejector Trouble-
shooting Chart

Table 36.1 shows the part sticking on ejector troubleshooting chart.

Table 36.1 Part Sticking on Ejector Troubleshooting Chart
Molding Process Mold Machine Material
low or high second- surface finish machine performance material type
stage pressure
low or high mold lack of ejection ejector plate moisture content
temperature
long or short cooling lack of draft robot handling release agents
time
fast ejection speed buildup
low or high melt slides or lifters
temperature
damage, erosion,
or burrs
lack of cooling

„ „36.3„ Part Sticking on Ejector Trouble-
shooting

There are many causes of part sticking on the ejector half of the mold and unfortu-
nately many settings can cause problems if set too low or too high. If relying on
processing alone to resolve a sticking problem the result will probably be a tight
process window, so dig deeper and find ways to improve the mold for best results.

36.3.1„ Part Sticking on Ejector Molding Process Issues

Possible molding process related sticking causes are:
ƒ Low or high second-stage pressure
ƒ Low or high mold temperature
ƒ Long or short cycle time
ƒ Fast ejection
ƒ Low or high melt temperature