Reasons for paper wrinkling during offset printing (1)

I. Mechanical reasons

1. The uneven pressure on the transfer roller

The paper is subjected to axial forces during the transport process, causing the paper to bulge in the middle when the paper is pre-positioned, forming wrinkles after imprinting.

2. The pressure of the impression cylinder grips the teeth

If the pressure on both sides of the impression cylinder rubs against the teeth, the wrinkling of the paper is wrinkled; if the strength of one side is not enough, the corresponding drag edge wrinkles; if the middle strength is not enough, the middle part of the paper Wrinkle.

3. Improper paper transfer

In the transfer process of the paper before the imprinting, if the improper fit, resulting in changes in the paper length of the crepe mouth, the dragging part is liable to wrinkle.

4. The tooth pad is uneven

When the paper is choked, if the pad is not flat, the edge of the paper will be wavy and the crease will partially wrinkle. ""

5. The position of the paper edge and tooth decay is incorrect

After the paper is positioned, if the paper is pinched by cavities, the edges of the paper are uneven and wrinkles may occur. +

6. The ink on the surface of the impression roller is too thick

The thick ink sticking on the surface of the impression cylinder will make the paper unsmooth when it is imprinted, and it will also produce local short-distance wrinkling and deformation.

Second, the paper causes

1. Tap the paper mark too deep, too dense

Due to improper paper knocking, the paper-knocking traces are too deep and too dense, and creases are easily generated at the creases of the knocked paper during printing.

2. The direction of the paper silk


When the paper enters the machine imprint, if it is a straight wire, it will easily cause wrinkles.

3. The paper has too much moisture

If the moisture content of the paper is too large, the fibers of the paper itself will expand. During the imprinting process, the expanded fibers will be narrowed due to the enlargement, and the dendritic creases tend to extend toward the direction of the dragging.

4. Influence of ambient temperature and humidity

Temperature and humidity changes in the environment, resulting in uneven moisture content of the paper, such as the surrounding water content greater than the middle, resulting in lotus leaf edge, printing paper wrinkles.

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