Processing Machinery
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GPPS Regrind Use Discoloration
Problem Phenomenon
After using regrind, the product color turns yellow and brittleness increases.
Cause Analysis
Accumulated heat history of regrind degrades and discolors PS; degradation also reduces molecular weight and affects strength.; during on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience
Solution
①Control the regrind ratio; ②manage regrind separately; ③test color and performance; ④use regrind with caution for transparent parts.; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
The discoloration and embrittlement problem of PS regrind is prominent; transparent products are recommended to use all virgin material.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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