Injection Molding
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TPU Injection Pressure Grading
Problem Phenomenon
Thin-wall parts are not fully filled, or excessively high pressure produces flash and internal stress cracking
Cause Analysis
TPU injection pressure is graded by structure: medium pressure for general parts, high pressure for thin-wall long-flow parts; excessively high pressure produces flash and internal stress, causing cracking during demolding; when troubleshooting on site, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience
Solution
①Set injection pressure graded according to product structure; ②Appropriately increase for thin-wall parts; ③Reduce pressure when flash and cracking occur; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
TPU pressure setting should be tailored to each part; high pressure buys filling, but also brings flash and stress risks; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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