Extrusion & Post
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PVC Profile Co-extrusion Layer Peeling
Problem Phenomenon
Co-extruded surface layer and substrate delaminate and peel, affecting appearance and protective function.
Cause Analysis
Two-layer material formula/plasticization state mismatch, insufficient interface temperature; poor co-extruder synchronization; insufficient interface bonding is the essence; during on-site troubleshooting, verify item by item according to this mechanism, avoid blindly adjusting the machine based solely on experience.
Solution
①Match formula and melt temperature of the two layers; ②Increase interface bonding temperature to promote fusion of the two layers; ③Synchronize extrusion speed of co-extrusion layers to ensure interface stability; ④Check co-extrusion die head condition; ⑤Optimize interface design to improve two-layer bonding strength.
Key Takeaway
PVC co-extrusion peeling = 'interface temperature and matching': the two layers must be fused in place with good synchronization; co-extrusion interface bonding is the core, formula and temperature must match.
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