Injection Molding
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Cracking of acrylonitrile-butadiene-styrene copolymer Products Caused by Internal Stress
Problem Phenomenon
The product cracks during use or storage; the root cause is the internal stress generated during processing.
Cause Analysis
（1）The injection speed is too fast, and molecular chain orientation produces orientation stress
（2）The holding pressure is too high or the holding pressure time is too long
（3）The mold temperature is too low, and the melt cools rapidly, producing thermal stress
（4）The product wall thickness is uneven, and stress concentrates at the thick-thin junction
（5）Mechanical stress during demolding
Solution
（1）Reduce the injection speed and adopt multi-stage injection
（2）Appropriately reduce the holding pressure
（3）Increase the mold temperature to a higher value within the 50-90°C range
（4）Optimize the product design with uniform wall thickness, and enlarge the fillets at the corners
（5）Ensure uniform force during demolding
Key Takeaway
Internal stress cracking is a manifestation of the processing stress exceeding the material strength.
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