Printing quality problems caused by the hottest pa

2022-08-16
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As the saying goes: people decorate clothes, horses decorate saddles, and the outer packaging of goods has become a problem that many manufacturers attach importance to. With the increasing requirements of people, a variety of processes are widely used in the outer packaging, which makes the goods colorful and dazzling, and arouses consumers' great desire to buy. However, due to the factors of materials, process technology, equipment, environment and so on, there will be phenomena such as missing printing, wrinkling, avoiding wear and ink fading, and the printing cylinder and printed matter will be polluted. As a printed matter, the nature of paper, the performance of ink and the density of printed pictures and texts all affect the quality of printing. Next, I will talk about these problems in view of the printed materials themselves

1. Missing printing

in the calendering section of the paper machine, it is common for the paper to be broken due to broken ends. These pieces of paper should be removed during rewinding, slitting and sorting. If there are pieces of paper clamped in the paper, it will cause missing printing and failure during printing. Paper mills often don't pay much attention to the problem of oneortwo pieces of shredded paper in the paper, thinking it has no big impact. In fact, shredded paper will bring great trouble and great economic losses to printing. When using web paper or flat paper for printing, if there are shredded paper in it, these shredded paper will adhere to the paper surface and enter the printing machine. The printing pressure and the viscosity of ink will make the shredded paper stick to the rubber drum or the layout. In this way, the words and images here on the printing plate cannot be transferred to the paper, so that the printed matter forms a missing print (if you suspect that the detector causes noise, it is commonly known as the window). On the high-speed printing machine, once this happens, dozens or even hundreds of printed matter will become waste, and the scraps of paper will be stripped off from the rubber roller or the layout and need to be shut down. In this way, the polynil P240 LHSV shown by Yili (Suzhou) Engineering Plastics Technology Co., Ltd. is a high-temperature nylon composite and semi aromatic nylon composite solution, and the loss will be even greater

2. The imprint cylinder and the printed matter are polluted

this pollution is often caused by holes and corners on the paper

holes refer to holes that can be seen through the paper with the naked eye under the light. Big holes are called holes. The paper with holes will leak words and pens when printing. When there are large holes or holes in the paper, the ink on the printing plate or rubber drum will be transferred from the holes to the embossing drum, so that the embossing roller hole will continue to transfer the ink to the other side of the printed matter when it continues to rotate, causing pollution and damage to the printed matter. When the ink is transferred to the embossing cylinder, if the ink viscosity is high, both sides of the paper will be bonded at the same time and a piece will be torn off. If the torn paper is stuck to the drum or plate of the rubber, the printing failure caused by the above-mentioned paper fragments will also occur

folding refers to the reverse folding of one corner of the printing paper, which will also cause serious printing failure. The angle can be divided into dead angle and live angle. When the paper with corners is printed, one piece of the printed matter printed on the paper cannot be printed, and one piece is printed with an image on the back. In addition, the ink in the corner part will also be transferred to the impression cylinder, causing the impression cylinder to continuously pollute the back of the printed matter, resulting in a lot of waste products. More seriously, if the paper is thick and hard, the corner may also damage the blanket, forcing the machine to stop and change the version

4. Ratchet wrench statement:

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