Print quality problems caused by the paper material itself
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As the saying goes: People dress clothes horse saddles, the outer packaging of goods has become a problem that many manufacturers pay attention to. With the increasing demands of people, a variety of techniques are widely used in the outer packaging, which makes the products colorful and dazzling, causing consumers to purchase greatly. However, due to factors such as materials, process technology, equipment, and environment, leakage, wrinkling, fading, impression cylinders, and printed matter may be contaminated. Paper as a printed matter, its nature, the performance of the ink, the density of printed graphics, etc., all affect the quality of printing. Let's talk about these issues for the printed material itself.
1, missing print
In the calendering section of a paper machine, it is common to have shredded paper on the paper due to breakage. These scraps should be removed during rewinding and slitting. If there are scraps of paper caught in the paper, it will cause printing and malfunction when printing. Paper mills often pay less attention to the problem of having two pieces of shredded paper in the paper, thinking that there is no big impact. In fact, shredded paper will bring great trouble and large economic loss to printing. When printing on web or flat paper, if there are pieces of shredded paper in it, these pieces of paper will adhere to the paper and enter the printing press. The printing pressure and the viscosity of the ink will cause the shredded paper to stick to the blanket cylinder. Or on the layout. This prevents the text and images on the plate from being transferred to the paper, causing the print to form a missing print (commonly known as opening a window). On high-speed presses, once this happens, dozens or even hundreds of prints are scrapped, and the scrapping of the scraps from the rubber roll or on the plate requires downtime, which is even more costly.
2, the impression cylinder and printed matter are contaminated
This contamination is often caused by holes and chamfers on the paper.
A hole is a small hole that passes through a paper surface that is visible to the naked eye under the illumination of light. The big hole is called the hole. Paper with holes will have a problem with the quality of the missing pen when printing. When there are large holes or holes in the paper, the ink on the plate or blanket cylinder is transferred from the hole to the impression cylinder, so that the impression cylinder continuously transfers the ink to the other side of the print while continuing to rotate, resulting in Damage to the prints. When the ink is transferred to the impression cylinder, if the viscosity of the ink is high, the paper is simultaneously bonded and peeled off on both sides. The torn piece of paper sticks to the blanket cylinder or the layout, and the printing failure caused by the above-mentioned shredded paper may also occur.
The folding angle means that one corner of the printing paper is folded back, and the folding angle also causes serious printing failure. The folding angle can be divided into two types: dead angle and live angle. When the paper with the angled corner is printed, one piece of the printed matter printed on the sheet of paper is not printed, and one piece is printed on the back side. In addition, the ink is also transferred to the impression cylinder at the corner portion, causing the impression cylinder to continuously contaminate the back side of the print, resulting in a lot of waste. More seriously, if the paper is thick and stiff, the folding angle may damage the blanket, forcing the machine to stop changing.