Injection Molding
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PVC Injection Product Dull Surface
Problem Phenomenon
Products dull and not bright, poor appearance.
Cause Analysis
Low mold temperature, poor plasticization, degradation darkening; PVC gloss is dually affected by plasticization and degradation; during on-site troubleshooting, verify item by item according to this mechanism, avoid blindly adjusting the machine based solely on experience.
Solution
①Appropriately increase mold temperature to improve melt replication and fit to cavity surface; ②Improve plasticization quality, eliminate unplasticized particles; ③Prevent degradation; ④Polish cavity; ⑤Stabilize melt temperature curve, avoid quality drift caused by temperature fluctuation.
Key Takeaway
PVC gloss = 'plasticization + mold temperature + anti-degradation': degradation dragging gloss dark is PVC's characteristic; plasticization and mold temperature manage replication, anti-degradation manages base color; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.
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