Page 298 - Injection Molding Advanced Troubleshooting Guide
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30.3 Flash Troubleshooting 291
Figure 30.7 Calculate required cylinder size
30.3.2.7 Mold: Mismatch
Sometimes what is being called flash is actually a mismatch in the parting line. No
matter what is changed on the machine or the process a mismatch will not im-
prove. shows an example of a mismatched parting line. When feeling for parting
line flash, true flash can be felt from both directions across the parting line, but a
mismatch will only be felt from one direction.
A mismatched parting line can arise from excessive polishing along the parting
line. Removing too much steel from one side of the mold during polishing can cre-
ate a mismatch that is objectionable. Care must be exercised when polishing near
a parting line.
Figure 30.8 Mismatched parting line
