How Is The Front And Back Of Flat Cigar Paper Boxes Printing Paper Judged?

How is the front and back of Flat Cigar Paper Boxes printing paper judged?

Most of the printing Paper used in Flat Cigar Paper Boxes is made of long screen machines or modified circular screen machines.

In both the long mesh machine and the round mesh machine, one side of the paper is always in contact with the mesh surface, while the other side is in contact with the blanket, resulting in two different surface states.

The paper and the net surface contact side, that is, the paper retained mesh traces on the side of the opposite side, and the other side is positive.

The main reason for the formation of positive and negative paper is the uneven distribution of filler and short fiber in both sides. From the top box of the paper machine out of the content of about 1% of the pulp, in the process of the net part of the movement of a large amount of water out, then with the discharge of water, packing and fine fiber will also be a large amount of loss. , of course, in the front of the water is more network department, packing and micro fiber can even out, but by less water network of middle and tail, they are just in the wet paper layer close to the net surface of the underlying partial discharge, the result is obviously make the catenary opposite part of the paper packing and micro fiber is much less than positive part.

Another reason for the production of positive and negative paper is that the paper is in contact with the mesh surface during the formation process, due to the plasticity of the slurry, thus leaving traces of mesh on the paper surface. As mentioned earlier, the pulp content flowing to the net is about 1%. In order to make the water filtration effect on the net obvious, a raceway roller and an air extraction box are arranged under the net to forcibly suck out the water, so the pulp has a part of the mesh into the mesh, which causes the appearance of the mesh under the pulp sheet. Even after the pressing and drying of the pressed light, there are still traces of mesh.

There are positive and negative paper, not only caused by the smoothness and gloss on both sides of the paper, but also on the paper absorption, ink absorption and crimping influence.

General non-coated paper is the judgment of the positive and negative with the naked eye: there is a net trace side for the negative side; The well-defined side is the front side.