Molding Process
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LLDPE film heat sealing problem
Problem Phenomenon
Heat seal initiation temperature is high or hot tack strength is low.
Cause Analysis
LLDPE has a higher melting point than LDPE, and the heat seal window is different; hot tack is related to the grade (comonomer type).
Solution
①Adjust the heat seal temperature according to the grade; ②select a heat-sealable grade (such as octene copolymer); ③optimize heat seal pressure and time; ④clean the contaminated film surface first.
Key Takeaway
For heat sealing, first check the grade's melting point and comonomer.
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