Processing Machinery
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Metallocene linear low density polyethylene film insufficient strength（Variant: Mass Production Scenario）
Problem Phenomenon
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 continuous mass production, this problem is more prominent and requires key attention.
Cause Analysis
（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） In continuous mass production, process parameter fluctuations or equipment status changes aggravate this problem
Solution
（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 establish standardized work instructions, paying special attention to parameter stability in continuous mass production
Key Takeaway
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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