Extrusion & Post
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Insufficient adhesion between EAA and aluminum foil
Problem Phenomenon
The adhesion between the EAA coating and the aluminum foil is <2N/15mm, peeling at heat sealing
Cause Analysis
The acrylic acid content of EAA is low <5%, insufficient adhesion to metal; the oxide layer or oil contamination on the aluminum foil surface hinders adhesion
Solution
1) Select EAA with AA content >8% to improve metal adhesion; 2) Clean the aluminum foil surface to remove oil contamination and oxide layer; 3) Raise the coating temperature to 200-230°C; 4) Increase the coating thickness to 20-30μm
Key Takeaway
Insufficient adhesion of EAA to aluminum foil is caused by low AA content and the surface condition of the aluminum foil; selecting grades with high AA content is the key
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