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Metal planar signs are usually made by screen printing or color printing. Metal signs made by printing process are very colorful and high-end, but there is also a disadvantage that they are vulnerable to external scratching during installation or transportation, which makes the paint on the metal surface fall off.

Therefore, in this context, the tag maker uses a layer of film on the metal tag to protect the paint on the surface of the metal tag, in order to ensure that the metal tag is more "safe" and then remove the film.