Molding Process
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Poor adhesion of PET vacuum aluminized film
Problembeschreibung
After vacuum aluminizing of PET film, the aluminum layer has poor adhesion and easily falls off or scratches.
Ursachenanalyse
Low surface energy of PET film (about 30-36mN/m), surface contamination (oil, dust), improper aluminizing process parameters.
Lösung
Corona treat PET film to dyne value ≥42mN/m; ensure film surface cleanliness; optimize aluminizing parameters vacuum ≤5×10⁻⁴Pa.
Wichtigste Erkenntnis
PET aluminized film adhesion depends on surface treatment and coating process.
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