Processing Machinery
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Metallocene linear low density polyethylene film insufficient strength（Variant: Startup Commissioning Scenario）
Fenómeno do problema
The film tensile strength or tear strength is lower than standard requirements, making it easy to break during use.
Insufficient strength affects the protective function of the film, especially critical in heavy-duty packaging films and industrial films.In particular, during new machine commissioning or the initial startup period, this problem is more prominent and requires key attention.
Análise das causas
（1） The raw material MFR is too high, molecular weight low and strength poor\
（2） Melt temperature too high, material degrades\
（3） Improper blow-up ratio or draw ratio, unreasonable molecular orientation\
（4） Film thickness insufficient\
（5） Regrind ratio in the raw material too high\
（6） During new machine commissioning or the initial startup period, process parameter fluctuations or equipment status changes aggravate this problem
Solução
（1） Select grades with lower MFR to increase molecular weight\
（2） Control the extrusion temperature within the 190-260°C range to avoid overheating degradation\
（3） Optimize the blow-up ratio （2-4） and draw ratio （3-6）, balance longitudinal and transverse strength\
（4） Check and adjust the film thickness to the standard value\
（5） Control the regrind ratio not exceeding 10%\
（6） And do well in parameter recording and archiving, paying special attention to parameter stability during new machine commissioning or the initial startup period
Conclusão principal
Insufficient film strength is caused by improper material selection or process parameters, requiring optimization from raw material, temperature and blow-up ratio.Targeted preventive measures need to be taken in different production scenarios.
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