Air bubbles are ensured to move smoothly in the gas guide groove, and the air bubbles are ensured to be pushed out of back-adhesive products successfully.
Compared with the prior art, the lines of the utility model, which are formed in the way that the L-shaped unit patterns formed by splicing two same parallelograms are aligned and distributed in a definite rule, and curves which can easily generate exhausting dead angles are avoided, thereby the tail end of the side edges of each parallelogram can extend outwards by the peripheric parallelograms connected with the tail ends of the side edges, and a gas guide groove formed by the lines has a gas guide channel which extends in all directions. The utility model relates to sprinkling-film paper which comprises a body paper layer and a sprinkling-film layer on the body paper layer, wherein, the surface of the sprinkling-film layer is provided with raised lines which are formed by splicing a plurality of L-shaped unit patterns with the same size, the unit patterns comprise a first parallelogram (1) and a second parallelogram (2) which have the same size, the length ratio of two adjacent short edges and long edges of each parallelogram is within the range from 1:2 to 1:3.
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