Injection Molding
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PVC Injection Product Stress Cracking
Problem Phenomenon
Products crack after assembly or contact with media.
Cause Analysis
Internal stress + media; PVC is sensitive to certain chemicals, high-stress parts crack under media action; during on-site troubleshooting, verify item by item according to this mechanism, avoid blindly adjusting the machine based solely on experience.
Solution
①Reduce internal stress; ②Do media compatibility/immersion verification before mass production; ③Rounded corner design; ④Optimize assembly design, avoid excessive interference fit; ⑤Anneal if necessary to eliminate residual stress.
Key Takeaway
PVC cracking = 'stress + media': internal stress is the internal cause, media is the external cause; high-stress parts must reduce stress from both process and structure; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.
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