Paper material and printing quality

As the saying goes: People dress their clothes and horse saddles, and the 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 packaging to make products colorful and dazzling. Consumers have great purchasing desires. However, due to factors such as materials, process technology, equipment, and environment, such phenomena as missed printing, wrinkling, faded ink, embossing rollers, and printed matter are contaminated. The paper as a printed matter, its own nature, the performance of the ink, the density of printed graphics, etc., have affected the quality of printing. In the following, these issues will be discussed with regard to the printed material itself.
1. Printed in the calendering section of the paper machine, paper shredding occurs due to the occurrence of breakage. These pieces of shreds should be removed during rewinding and slitting. If there are scraps of paper caught in the paper, it will cause missing prints and malfunctions during printing. Paper mills often do not pay much attention to the problem of one or two pieces of paper scraps in the paper, thinking that there is no big impact. In fact, shredded paper will bring great troubles for printing and greater economic losses when using web paper. When printing on flatbed paper, if there are scraps of paper in it, these scraps of paper will adhere to the surface of the printer and the printing pressure and the viscosity of the ink will cause the scraps of paper to adhere to the blanket cylinder or plate. In this way, the text and images on the printing plate cannot be transferred to the paper, causing the printed matter to form missing prints (commonly referred to as windows). On high-speed printing presses, once this happens, tens or even hundreds of prints can be rejected, and the loss of the shreds from the squeegee or the plate needs to be shut down.
2. Contamination of impression cylinders and prints This contamination is often caused by holes and folds in the paper.
Holes are small holes that can be seen through the paper with the naked eye under light. Big hole called hole. Paper with holes may cause problems with the quality of missing pens during printing. When there is a large hole or hole in the paper, the ink on the printing plate or blanket cylinder is transferred from the hole to the impression cylinder, so that the printing roller continuously transfers the ink to the other side of the printed product while continuing to rotate. Causes damage to printed matter. When the ink is transferred to the impression cylinder, if the viscosity of the ink is high, the paper will also be stuck on both sides and be torn off. The torn paper sticks to the drum or plate of the eraser, and the printing failure caused by the above scraps of paper also occurs.
The folding angle refers to a corner of the printing paper coming back. The folding angle also causes serious printing failure. The folding angle can also be two kinds of dead fold and live folding angle. When printed with folded corners, the printed matter on the sheet is not printed on one sheet, and one sheet is printed on the back. In addition, the ink is also transferred to the impression cylinder at the corner portions, causing the impression cylinder to continuously contaminate the back side of the print, resulting in a lot of scrap. Even more serious is that if the paper is thick and stiff, the folded corners may also damage the blanket, forcing downtime change.