Injection Molding
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PVC Injection Product Peeling
Problem Phenomenon
Surface layer peeling, obvious at edges.
Cause Analysis
Mixing contamination, poor plasticization causing poor interlayer bonding, excessive release agent; when PVC plasticization is poor, interlayer fusion is poor; during on-site troubleshooting, verify item by item according to this mechanism, avoid blindly adjusting the machine based solely on experience.
Solution
①Check mixing and contamination, standardize raw material and regrind storage management; ②Improve plasticization quality, eliminate unplasticized particles; ③Control release agent dosage, avoid forming isolation layer on surface; ④Thoroughly purge, remove accumulated material in barrel and hot runner dead corners; ⑤Stabilize melt temperature curve, avoid quality drift caused by temperature fluctuation.
Key Takeaway
PVC peeling = 'contamination and plasticization': interlayer non-fusion caused by poor PVC plasticization is its characteristic; first check contamination then grasp plasticization, release agent dosage must also be controlled.
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