Extrusion & Post
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Insufficient peel strength of PET extrusion coating
Problem Phenomenon
PET extrusion coating on other substrates (paper, aluminum foil) has insufficient peel strength and easily delaminates.
Cause Analysis
PET melt has poor adhesion to the substrate; the substrate surface is untreated or insufficiently treated; coating temperature is on the low side and wetting is insufficient.
Solution
Corona or flame treat the substrate to increase surface energy; increase coating temperature to improve wettability; increase laminating roller pressure.
Key Takeaway
PET extrusion coating bonding requires dual guarantees of substrate surface treatment and process temperature.
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