Method for eliminating wrinkles of paper during printing

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North were my unit printing machine 05 years the use of longer, often appear printed paper crease, seriously affecting the quality of printing. With many years of experience in equipment operation and understanding of equipment, the author made appropriate adjustments in the following aspects, the paper wrinkling phenomenon was significantly reduced, and the printing quality and production efficiency were greatly improved. Below, the author will share these adjustment methods with everyone, hoping to help the industry peers.

1. Strictly control the temperature and humidity of the workshop

Under normal circumstances, the paper needs to be placed in the paper library for a while after entering the factory. The paper should be placed in the workshop 3 to 4 days before printing, and the temperature and humidity of the workshop should be strictly controlled. The temperature should be controlled at 20-25 Â°C, and the humidity should be controlled at 50%-60%. To this end, our unit to improve the closure of the workshop by using the partition wall and the ceiling of the house to use the high-power air conditioner to adjust the temperature of the workshop, and to adjust the humidity of the workshop by spraying water in the workshop during the dry season.

2. With the printing with paper

Paper wrinkles in my unit occur mostly on white paper, coated paper, and on paper with a lower amount of individual weight. The reason is that the paper has uneven water content during the printing process, causing the paper to wrinkle around, thereby affecting the printing registration or causing inconsistent rules and delaying the completion of the production task. In order to avoid this phenomenon as much as possible, our company has adopted the measures of not cutting paper in advance and cutting with paper, which avoids the phenomenon that the paper is tightly blown by the wind. If the paper has already been tight, the degree of wrinkling can be reduced by knocking the paper at the mouth of the paper.

3. Adjust the tightness of the paper feeding belt and the pressure roller

Since the paper moves forward under the action of the paper feeding belt and the pressure roller, the tightness of the paper feeding belt and the pressure roller affects the flatness of the paper, and the paper enters the oscillator only in a flat state, so as to maximize the paper. Reduce the occurrence of wrinkling of the paper, so adjust the tightness of the paper feeding belt and the pressure roller correctly.

4. Adjust the oscillator pad

The oscillating pad will not be flat due to wear, and the oscillating tooth will cause local unevenness of the paper when it is creped. When the paper is transferred to the impression cylinder, the unevenness of the paper is likely to occur at the fixed point wrinkles under the pressure of the blanket cylinder. Therefore, the machine personnel should always check whether the pads of the press oscillator are flat.

5. Adjust the impression roller row

When the printing machine is used for a long time, the unevenness of the crepe paper may occur in the rows of the impression cylinder, and irregular pleats may occur at the tip of the paper under the pressure. To solve this problem, replace the cavities of the impression cylinder row and adjust the tension of the rows to make them consistent.

6. Adjust the printing pressure

During the operation of the printing press, when paper wrinkling occurs, the printing pressure should be minimized to reduce the wrinkling of the paper.

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