Material Analysis
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Metallocene linear low density polyethylene film insufficient heat seal strength
Problem Phenomenon
After heat sealing, the seal strength of the film is low, and the seal cracks under stress.
Insufficient heat seal strength affects packaging sealability and causes leakage in food packaging films.
Cause Analysis
（1） Heat sealing temperature too low, melting insufficient\
（2） Heat sealing pressure insufficient or time not enough\
（3） Film thickness uneven, the heat seal location is too thin\
（4） The film surface is contaminated or has additive exudation\
（5） Improper heat seal material selection
Solution
（1） Adjust the heat sealing temperature according to the melting point of metallocene linear low density polyethylene, generally 10-20°C higher than the melting point\
（2） Increase heat sealing pressure to 0.2-0.4MPa, heat sealing time 0.5-2s\
（3） Ensure film thickness is uniform, especially at the heat seal location\
（4） Control additive dosage to avoid surface exudation affecting heat sealing\
（5） Use heat seal layer materials if necessary （such as LDPE, EVA, etc.）
Key Takeaway
Insufficient heat seal strength is caused by improper temperature, pressure or time settings, requiring optimization of heat sealing process parameters.
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