The troubleshooter Part 71:What caused the blush?

摘要

I had an interesting problem come up last week.A package landed on my desk that contained a cap and the runner system that goes with it.The note said the material was PC/ABS and the problem was blush at the gate.I looked at the part but couldn't see the blush mentioned in the note until I used a bright light and a 5X magnifier.Then I could see a substantial amount of blush on the outside of the part curvature and right at the gate.The reason it was so hard to see is that the part was colored white-one of the best colors to use when you don't want defects to show up.Whether or not this was why they chose it as the"production color I don't know,but it certainly did the job on this part.