TIP: always test on a finished product, after some time of storage, and maybe after a back-and-forth transport cycle or some exposure to UV light (labs exist to simulate climatic and UV aging conditions)
Why would the film not stay as an end-user protective film? (mobile applications: users even pay to apply such films … why not put that directly at the factory, a bit thicker film?)
as support for printed marketing or brand?
used as Instruction For Use? (at least captures some attention before being taken out) … if replaceable, could even be used as a sticky note & be stuck in a handy place?
other possibilities?
Other examples
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用語集
instruction For Use (IFU): 医療機器または製品の適切な使用、取り扱い、メンテナンスに関する詳細情報を提供し、ユーザーの安全性と有効性を確保する文書。