Molds & Tooling
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PVC Foam Product Poor Surface Skinning
Problem Phenomenon
Skin-foam board surface uneven, broken skin, poor appearance.
Cause Analysis
Improper mold temperature, large foaming pressure fluctuation; skinning and foaming not synchronized; surface setting and internal foaming rhythm not matched well; during on-site troubleshooting, verify item by item according to this mechanism, avoid blindly adjusting the machine based solely on experience.
Solution
①Stabilize mold temperature, avoid drift; ②Stabilize extrusion pressure, eliminate pulsation; ③Adjust foam regulator dosage; ④Optimize temperature field, ensure uniform temperature in all zones; ⑤Match the rhythm of surface skinning and internal foaming.
Key Takeaway
PVC skinning = 'temperature and pressure synchronization': rhythm matching of skinning and foaming is the core; mold temperature and pressure stability determine surface skinning quality; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.
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