People's demand for high-efficiency and high-quality reproduction of printed products has never stopped during the development of the printing industry, but it is limited to the design and manufacturing accuracy of the machinery industry. This fantasy printing machine has not been realized. Until one day, people The quality of the printed matter has temporarily sacrificed in an attempt to develop a printing machine with a superior printing speed. The basic requirements of this printing machine for the ink transfer system are: â‘ There is a sufficient amount of ink, â‘¡ The amount of ink must be uniform, â‘¢ The ink can be supplied quantitatively over and over. Only in this way can a large number of reproductions be met. Otherwise, one sheet is dark, the other is dark, the ink is dark and dark, and the text and lines are thick and thin, which cannot meet the quality requirements. This has promoted the derivation and development of the anilox roller system to some extent.
[Analysis] Corrugated paper printing for packaging transformation: technical improvement of anilox rolls
[Extended] Are you misunderstanding the application of anilox rolls?
[Parameters] How much do you know about the technical parameters that determine the ink transfer performance of the anilox roller?
The anilox roller was not used in the early flexographic printing ink transfer system, so the ink color was very unstable, and only the less demanding products could be printed. The anilox roller was developed through continuous improvement in practice.
The flexographic printing ink transfer system began to use rubber rollers, felt rollers, and metal smooth rollers. The rubber roller is made of natural rubber, its mechanical precision is not high, and the ink is difficult to control, so it can only print some rough and simple paper bags at the time; the felt roller uses the felt to absorb ink, but the felt life is not long. Soon after use, the connecting material in the ink will make the felt hard, and the felt loses the characteristics of absorbing and releasing ink, so it is not ideal. Although the processing accuracy of the metal smooth roller is relatively high, the gap between the two rollers can be used to control the amount of ink, but due to the tension of the ink, the ink will accumulate and produce one line of streaks, resulting in uneven ink transfer, so the printing quality Not high.
In the future, some people used high-speed spraying of steel shots on the surface of the metal smooth roller to increase the hardness of the metal surface to produce roughness and pits on the surface of the metal smooth roller. Although the properties of the metal smooth roller were changed, the ink was not easy to accumulate, but the spray Maru cannot guarantee that the depth is consistent with each roll; it has also been tried to sinter ceramics on steel rolls to naturally form irregular pits, but it is also not easy to control.
Around the 1930s, due to the development of photographic and electroplating corrosion technologies, the metal anilox rolls were corroded with copper plated on steel rollers and then printed with carbon paper or photographic film. This type of anilox roller can be controlled due to the anilox and copy processing. Although it has taken a big step forward and laid the foundation for the development of the anilox roller, it is still not ideal:
â‘ There is a seam, and the amount of ink at the seam is uneven;
â‘¡The screen wire is relatively thick, about 100 l / in or less. It is thin and difficult to manufacture and corrode. In the early 1980s, when manufacturing a laminated flexo printing machine, the imported metal anilox roller was expensive and used corroded anilox roller.
The development process of things is always constantly improving and perfecting. The development of anilox rolls has been improved and improved according to advanced processing techniques in different periods. After corroding the anilox rolls, copper plating on steel rolls has been used, and then mechanical engraving and Electronically engraved metal anilox rollers have appeared ideal metal anilox rollers without seams. But mechanical engraving is slow, and electronic engraving is carried out on steel (Shanghai Printing Technology Research Institute has successfully developed and put into production metal anilox rolls directly engraved on steel rolls), and later developed mechanical extrusion technology, directly on steel The metal anilox roller processed on the current, metal engraving roller of electronic engraving and mechanical extrusion is still widely used in corrugated box printing slotting machine, laminated flexo printing machine, and coating equipment.
Regardless of the metal anilox roller processed by electronic engraving or mechanical extrusion, the number of anilox lines is generally less than 30,000 liters / in. The product therefore also limits the improvement and development of flexographic printing quality.
In the mid-1980s, laser technology was used to develop ceramic anilox rollers using laser engraving. The ceramic anilox rollers can process a higher number of lines, have a wear-resistant surface, and can use a doctor blade to make the ink transfer system. The amount of ink transfer is more accurate and stable, so the appearance of ceramic anilox roller not only makes the ink transfer system of flexographic printing further improved, but also meets the requirements of printing fine products, and promotes the development of flexographic printing.
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