Welcome to our乐动体育赞助西甲Plastic Injection Molding Defectsseries, where we will explain some common defects seen by injection molders and present ways to fix or prevent them.

What is an Ejector in Injection Molding?

The ejector is the part of the molding process that pushes the part out of the mold when it's time to do so.Because of the ejector itself and the ejector pins, there are several areas that could result in the mold sticking to the ejector.

What Causes Parts to Stick on the Ejector?

This is one of the most difficult injection-molding defects to diagnose because there are so many possible reasons a part would stick to the ejector.In the molding process itself, multiple settings could be off one way or another.Second-stage pressure, mold temperature, cooling time, melt temperature, and possibly a fast injection speed.

When you're looking at the molding process as the culprit, you'll likely end up with a tight processing window.At that point, you should look into improving the mold itself for the best results.

Table 36.1Part Sticking on Ejector Troubleshooting Chart, found in Injection Molding Advanced Troubleshooting Guide: The 4M Approach (p.345)

Molding Process	Mold	Machine	Material
Low or high second-stage pressure	Surface finish	Machine performance	Material type
Low or high mold temperature	Lack of ejection	Ejector Plate	Moisture content
Long or short cooling time	Lack of draft	Robot handling	Release agents
Fast ejection speed	Buildup
Low or high melt temperature	Slides or lifters
	Damage, erosion, or burrs

How to Prevent Parts from Sticking on the Ejector

When you use ourHeat Cure™andQuick Curecoatings—which are also ideal for preventing pin push—you get extraordinary release characteristics, preventing the ejector pins from sticking in the plastic.

Becauseinjection mold buildupcould also be an issue with sticking parts, you could also try one of our mold cleaners likeClean-N-Run,Mold Brite,Power Clean,Kleen All, andZap-Ox.

Feel free tocontact usif you have questions about our products and how they might solve your injection-molding problems.

乐动体育赞助西甲Stay tuned for future installments of our plastic injection molding defects series.

Source:ld乐动体育 by Randy Kerkstra and Steve Brammer.