Functional film

Abstract

This invention provides a functional film that facilitates the detection of marks on specific defective parts, and the marks are not easily transferred even when the film is wound back up. The functional film is a film with a mark, wherein the mark is formed by creating one or more markings consisting of dot-like cavities and burrs formed at the edges of the cavities. The diameter of the cavities is 40 μm or more, the depth of the cavities is 10 μm or more, the width of the burrs is 15 μm or less, and the height from the surface of the functional film without the mark on the burrs is 6 μm or less.

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