Processing Machinery
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Insufficient heat seal strength of polyolefin plastomer films (Variant: Enhanced Measures)
Fenómeno do problema
The seal strength of the film after heat sealing is low, and the seal cracks when stressed.
Insufficient heat seal strength affects the packaging sealing and causes leakage in food packaging films.
In particular, additional attention is needed on the original basis; this problem is more prominent and requires focused attention.
Análise das causas
（1）The heat seal temperature is too low and the melting is insufficient
（2）The heat seal pressure is insufficient or the time is not enough
（3）The film thickness is uneven and the heat seal area is thin
（4）The film surface is contaminated or additives have precipitated
（5）The heat seal material is improperly selected
（6）On the original basis, additional attention is needed: fluctuations in process parameters or changes in equipment status have aggravated this problem
Solução
（1）Adjust the heat seal temperature according to the melting point of the polyolefin plastomer, generally 10-20°C higher than the melting point
（2）Increase the heat seal pressure to 0.2-0.4MPa and the heat seal time to 0.5-2s
（3）Ensure uniform film thickness, especially at the heat seal position
（4）Control the amount of additives to avoid surface precipitation affecting heat sealing
（5）Use heat seal layer materials (such as LDPE, EVA, etc.) when necessary
（6）And strengthen process monitoring; on the original basis, additional attention is needed to pay special attention to parameter stability
Conclusão principal
Insufficient heat seal strength is caused by improper temperature, pressure, or time settings, and the heat seal process parameters need to be optimized.
Targeted preventive measures need to be taken in different production scenarios.
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