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Paper in the printing problems that need attention

  Offset lithography is the use of oil and water immiscible principle to perform printing. The printed sheets are generally elongated, while contraction shorter uncommon for the elimination of such a failure, is now on the printing process to explore.

The paper is a variability-containing plant fibrous tissue material, it has the function of the absorbent releasing wet, to adjust the balance when the moisture in the air is constantly changing, it will occur and air humidity. When the water contained in air humidity higher than paper, it will absorb moisture from the air expands elongation; contrary will release moisture and shrink shorter to achieve balance and the relative humidity of the bad environment.

Offset lithography is the use of oil and water immiscible principle to perform printing. Printed sheets are generally elongated, while contraction shorter uncommon to eliminate such failures are now on the printing process to explore:

, printing make cross wire lock

The paper cross wire lock and vertical wire lock. The papermaking part in the papermaking process, the pulp (plant fiber) is a vertical flow moving wire-line, fiber by the sudden acceleration, mostly along the direction of movement of the wire mesh link, this will form what we call The vertical and horizontal wire lock. Plant fibers in the paper are hollow and translucent tubes, we can image: the direction of the length of the fiber itself is what we call vertical wire lock, and the direction of fiber and fiber gap cross wire lock. Experimental results show that: the cohesion of the fiber itself is greater than the binding force between the fibers (mainly hydrogen bond force). After the moisture of the paper, the direction of stretching of the longitudinal wire lock to be smaller than the expansion and contraction of the cross-direction of the wire lock, both substantially Therefore, accurate overprint must consider the relationship of the deformation of the wire lock aspect of their paper. Therefore, at the time of printing, the paper a vertical wire lock direction and parallel to the drum shaft, and the same batch of the printing paper the direction of the wire lock to be consistent.

, overprint water (commonly known as the water pressure)

Printing paper is not a good understanding of the situation, in order to prevent the elongation of the paper in the printing, the first overprint Shimizu methods can be used to make the paper to meet the printing requirements, and then start printing color, this method is not allowed to solve the overprint There are a certain role.

, the control of the printing layout of water

The size of the printed layout of water is a key factor that controls the paper telescopic, the layout of the moisture passing through the blanket to the paper, the greater the layout of water, telescopic greater. Thus, the layout of the moisture control as small as possible, especially particular attention to the 80 grams of offset paper for printing .

, pull Edition machine elongated plates

General monochrome machine in the third, four-color printing process, the two-color machine in the second printing process, the image on the paper larger elongation, resulting overprint is not allowed. This is because the PS plate has good ductility, can pull Edition machine elongated, so that the image on the paper plate image with balanced elongation to allow the overlay accuracy.

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