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Method for solving uneven collection and placement of printed matter in offset printing production

        In the process of offset printing production, there is often the phenomenon of uneven receipt of printed matter. For a long time, it will have a bad impact on offset printing equipment and printing quality. In actual printing, the common manifestations of uneven collection and placement of printed matter are as follows

Method for solving uneven collection and placement of printed matter in offset printing production

1. Paper dropping

       The paper falls at the receiving position. Take out the dropped paper and compare it with the normal printed matter. If it is found that its mouth is smaller than that of the normal printed matter, it indicates that the paper drop phenomenon is caused by the inadequate paper feeding. Method for solving uneven collection and placement of printed matter in offset printing production

       If the side gauge is lifted and the paper cannot be dropped during trial printing, it indicates that the paper drop is caused by improper adjustment of the side gauge.Method for solving uneven collection and placement of printed matter in offset printing production

2. There is a breach in the mouth of the printed matter

       Adjust the front gauge to reduce the paper holding capacity of the paper transfer teeth. If the break disappears at this time, it indicates that it is caused by excessive paper holding capacity of the paper transfer teeth. Method for solving uneven collection and placement of printed matter in offset printing production

       If the break still exists, let the tooth opening angle of each function of the paper transfer system be greater than 45 degrees, so that its outermost end is at the same horizontal line. If the break disappears at this time, it indicates that the break is caused by too small tooth opening angle or too long tooth.Method for solving uneven collection and placement of printed matter in offset printing production

        If the break has not disappeared, the distance between the tooth pads of the two functional sheets before and after the paper transfer system at the moment of paper handover shall be detected to keep the distance at about 20-30 wires, so as to solve the problem of tooth break of printed matter.Method for solving uneven collection and placement of printed matter in offset printing production

3. Printed matter is mutually exclusive

      Printed matter repels each other, paper floats, and cannot be returned in time. At this time, check the water supply and the sound level during paper embossing and separation. Method for solving uneven collection and placement of printed matter in offset printing production

      Small water supply and high transfer pressure will increase the static electricity of printed matter, resulting in the above phenomenon.Method for solving uneven collection and placement of printed matter in offset printing production

4. The front printed matter at the paper receiving position is knocked out by the subsequent chain row

      This is caused by the uneven paper suction of the air suction cover. At this time, check the gap between the suction wheel and its lower suction air volume, the suction air volume and the wear of the outer ring of the suction cover.Method for solving uneven collection and placement of printed matter in offset printing production

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