11/13/2022 0 Comments Breakaway speed![]() If you see cracks this time, you know there’s an ejection issue. If there are no cracks, eject the part and check again. If you see them, you know you have another issue. Stop the mold process prior to ejection and look for cracks. Since cracking usually occurs during ejection, it’s important to determine if the ejection itself is causing the issue or if it’s another issue that leaves the part vulnerable to ejection. A high melt temperature or improper residence time in the barrel could degrade the part and make it susceptible for cracking during ejection. Check the part design-are there areas with sharp corners that act as stress risers and initiate cracks? If so, adding more radius to those areas can alleviate the stress and thus the cracks.ĭuring the molding process, you could be facing high second-stage pressure, causing the material to stick which can lead to cracks when the mold opens or during ejection. While cracks often occur post-mold, identifying the underlying issue is extremely important in being able to prevent cracking from happening. #BREAKAWAY SPEED HOW TO#224) How to Eliminate Cracking in Injection Molding Table 24.1 Cracking Troubleshooting Chart, found in Injection Molding Advanced Troubleshooting Guide: The 4M Approach (p. In addition to post-molding conditions, cracking can be caused by a number of process settings, including second-stage pressure, melt temperature, residence time in barrel, ejection, part removal, operator error, mold breakaway and gate seal. Cracks usually occur due to post-molding conditions, but when troubleshooting cracking, you want to know exactly when the cracking is happening as it will help you efficiently address potential issues and ultimately solve the problem. When a part is physically fractured or broken, you’re experiencing cracking. ![]()
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