Processing Machinery
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PVC Soft Product Plasticizer Exudation
Problem Phenomenon
Soft PVC product surface oily and sticky, affecting appearance and use.
Cause Analysis
Insufficient compatibility of plasticizer with PVC or excessive amount; high temperature accelerates migration; plasticizer migrates to surface forming oil layer; during on-site troubleshooting, verify item by item according to this mechanism, avoid blindly adjusting the machine based solely on experience.
Solution
①Switch to plasticizer with better compatibility with PVC; ②Control additive dosage to avoid excessive exudation; ③Evaluate using high-molecular plasticizers with slow migration; ④Control use environment temperature to reduce migration exudation; ⑤Do additive exudation test evaluation.
Key Takeaway
PVC soft material oiling = 'plasticizer compatibility': compatibility and dosage are key; high-molecular plasticizers migrate slowly, the upgrade direction for preventing oiling; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.
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