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LLDPE extrusion material changeover gel

Fenómeno do problema

A large amount of gel particles appears after changing from LDPE to LLDPE.

Análise das causas

Large viscosity difference between the two materials, residual material retention and stratification; incomplete cleaning.

Solução

①Gradient temperature cleaning; ②extend purging time; ③disassemble and clean the die head when necessary; ④record the material changeover SOP.

Conclusão principal

Material changeovers with large viscosity differences require thorough purging.

LLDPE; material changeover; gel; machine cleaning; SOP

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