Processing Machinery
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HDPE molecular weight influence
Fenómeno do problema
After changing grades with the same equipment and same process, the product performance and processing behavior change significantly
Análise das causas
HDPE molecular weight determines melt strength and ESCR: high molecular weight grades have good ESCR but are difficult to process; low molecular weight is easy to process but has poor mechanical properties; MFR is the core indicator for grade selection
Solução
①Select a grade with matching MFR according to product requirements; ②select low MFR high molecular weight for high ESCR requirements; ③select high MFR for thin-wall fast molding; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Conclusão principal
The essence of HDPE grade selection is molecular weight matching; MFR is the bridge connecting processing and performance; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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