Alignment of the grain of the paper, so that in the production stage it is oriented in the running direction of the paper machine. The grain direction affects the quality of various printing and finishing operations, so it is important to check it before printing production. In most papers, the grain is oriented in parallel to the long side of the sheet. The second figure defining the measurements of a sheet indicates the side parallel to the grain direction. For example, the grain in a 64×88 cm sheet is parallel to the long side, while in an 88×64 cm sheet it is parallel to the short side.