The printing paper materials used in the process of printing work are basically manufactured by a long screen machine or a modified rotary screen machine.
Whether it is a long screen machine or a round screen machine, the forming process of the paper sheet is always in contact with the screen surface on one side and the felt on the other side, resulting in two different surface states.
The side of the paper that is in contact with the screen, that is, the side on which the trace of the mesh remains on the paper, is the reverse side, while the other side is the front side.
The main reason for the formation of the front and back sides of the paper is caused by the uneven distribution of fillers and short fibers on the front and back sides. The pulp with a content of about 1% flowing out of the high box of the paper machine has a large amount of water flowing out during the course of the wire section. At this time, as the water is discharged, the filler and fine fibers will also be lost in large quantities. Of course, the filler and fine fibers can be evenly discharged in the front of the net with a lot of water, but when the middle and tail of the net with less moisture are present, they are only close to the bottom part of the net in the wet paper layer As a result of the discharge, the filler and fine fibers on the reverse side of the paper that is in contact with the mesh side are significantly less than the front side.
Another reason for the positive and negative sides of the paper is that the paper is in contact with the mesh surface during the formation process. Due to the large plasticity of the slurry, the texture traces are left on the paper surface. As mentioned above, the pulp content flowing to the net is about 1%. In order to make the water filtering effect on the net obvious, there are rolling rollers and air suction boxes under the net to force the water out, so part of the pulp enters the net In the mesh of the part, this causes the shape of the net to appear under the paddle. Even after pressing and drying after calendering, there are still traces of reticulation.
There are positive and negative sides of the paper, which not only cause differences in the smoothness and glossiness of the two sides of the paper, but also affect the absorbency, ink absorption and curling of the paper.
In general, the judgment of the front and back sides of non-coated paper is visually observed: the side with mesh marks is the back side; the side with clear lines is the front side.
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