1. A flat packing belt, comprising a front face and a back face, wherein the front face and the back face are provided with same raised oblique-strip patterns, so that an oblique direction, an oblique angle and a distance between adjacent raised oblique-strip patterns of the raised oblique-strip patterns observed from an orthographic projection of the front face are the same as the oblique direction, the oblique angle and the distance between adjacent raised oblique-strip patterns of the raised oblique-strip patterns observed from the orthographic projection of the back face.
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