Extrusion & Post
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LLDPE wire and cable
Fenómeno do problema
LLDPE cable sheath is more resistant to environmental stress cracking than LDPE, but processing difficulty is high
Análise das causas
LLDPE has excellent electrical insulation and ESCR, suitable for cable sheath; but high viscosity makes extrusion difficult; carbon black dispersion and melt fracture are two major process challenges
Solução
①Choose LLDPE for cable sheath to exploit ESCR advantage; ②verify carbon black masterbatch dispersion; ③use PPA to eliminate melt fracture; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Conclusão principal
LLDPE cable sheath is a balance of performance and process; the ESCR advantage is worth the process investment; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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