Paper flattening mechanism and printed matter online detection system

The utility model discloses a flattening mechanism for paper. The flattening mechanism comprises an air supply device; the flow equalizing cavity is connected with the air supply device; the multiple nozzles are communicated with the flow equalizing cavity and used for blowing out fan-shaped gas, and the multiple nozzles are arranged side by side in the same direction, so that the fan-shaped surfaces of the multiple fan-shaped gas are connected with one another, and a straight line is formed on the surface of a base body to be jetted. By means of the structural design of the nozzles and the arrangement design of the nozzles, fan-shaped airflow formed by the nozzles is located on the same plane, the airflow is in a linear fan-shaped spraying angle, a linear air knife is formed to act on paper, the paper is flattened to the maximum extent, and the possibility that the paper is wrinkled and curled is reduced. 本实用新型公开一种纸张的展平机构，包括：供气装置；均流腔体，所述均流腔体与供气装置连接；和多个喷嘴，多个喷嘴与所述均流腔体连通，用于吹出扇形气体，且多个喷嘴沿同一方向并排设置，使多个扇形气体的扇面相互连接从而