1. The front and back of the paper

1. The front side of the paper: -- The woolen surface, relatively smooth and compact.

2. The reverse side of the paper: - the screen surface. During the paper sheet forming process, it comes into contact with the screen surface, causing screen printing on the paper surface. Therefore, the reverse side is always relatively rough and loose.

 Ii. The Impact of the duality of Paper on Printing Quality

It can lead to the unevenness of printed matter quality and is not conducive to the control of printed matter quality.

2. The front side of the paper has a higher smoothness and better ink application effect, but its surface strength is lower than that of the back side, meaning it is more prone to fringing during printing.

3. The reverse side of the paper is relatively rough, with a poorer ink application effect than the front side, but it has a higher surface strength and is less likely to experience fraying during printing.

Iii. Uniformity of Paper

The uniformity of paper: It refers to the uniformity of the distribution of fibers in the paper, that is, the distribution of fibers and structures on a certain area of the paper.