Processing Machinery
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Insufficient heat seal strength of metallocene linear low-density polyethylene film (variant: strengthened measures)
Fenómeno del problema
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 film.
Especially, additional attention is needed on top of the original basis; this problem is more prominent and requires focused attention.
Análisis de la causa
(1) Heat seal temperature is on the low side and melting is insufficient
(2) Heat seal pressure is insufficient or time is not enough
(3) Film thickness is uneven, and the heat seal area is on the thin side
(4) The film surface is contaminated or additives have migrated out
(5) Heat seal material selection is improper
(6) On top of the original basis, additional attention is needed as process parameter fluctuations or equipment condition changes aggravate this problem
Solución
(1) Adjust heat seal temperature according to the melting point of metallocene linear low-density polyethylene, generally 10-20°C above the melting point
(2) Increase heat seal pressure to 0.2-0.4MPa, with heat seal time of 0.5-2s
(3) Ensure uniform film thickness, especially at the heat seal position
(4) Control additive dosage to avoid surface migration affecting heat sealing
(5) Use heat seal layer materials if necessary (such as LDPE, EVA, etc.)
(6) And strengthen process monitoring; on top of the original basis, additional attention is needed to pay special attention to parameter stability
Conclusión clave
Insufficient heat seal strength is caused by improper temperature, pressure or time settings; heat seal process parameters need to be optimized.
In different production scenarios, targeted preventive measures need to be taken.
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