Processing Machinery
5 görüntüleme
Insufficient heat seal strength of metallocene linear low-density polyethylene film (variant: mass production scenario)
Sorun Belirtisi
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 in continuous mass production, this problem is more prominent and requires focused attention.
Neden Analizi
(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) In continuous mass production, process parameter fluctuations or equipment condition changes aggravate this problem
Çözüm
(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 establish standardized work instructions; pay special attention to parameter stability in continuous mass production
Temel Çıkarım
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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