The engraving technology Hell showed at Drupa 2012 can reach a printing accuracy of 70L/cm. It not only realizes the laser engraving of complex tonal image reproduction, but also obtains a rich layer of long-range printing products.
High-gloss small dots are difficult to reproduce has been the weakness of the resin letterpress, because on the one hand, small dots are easily lost in the photosensitive imaging, on the other hand, the small dots on the plate are easily deformed during the imprinting process, resulting in transfer to the print product. Small outlets on the expansion, high-light off the network, bright transitions hard.
Hell, which is known for making gravure platemaking systems to solve the above problems, exhibited several letterpress laser engraving machines at Drupa2012, including flexible letterpress laser engraving equipment. In addition to the improvement of the shape of the dot, the machine also carved small dots and large dots into different heights, using the height difference to reduce the pressure on the small dots, so as to ensure that the small dots are less deformed and more abundant in the bright tone region. The tone.
Flexible letterpress laser engraving was commonly used in corrugated carton printing, but its accuracy was low, and it was generally used only for text, lines, and solid color printing. The engraving technology Hell showed at Drupa2012 can achieve a printing accuracy of 70L/cm. It not only realizes the laser engraving version for complex tone image reproduction, but also can obtain rich-level long-term printing products, which is worthy of attention.