The type of electronic engraving technology and its limitations
Gravure electronic engraving technology Organic electro engraving, laser direct engraving, laser ablation etching and electron beam engraving. Among them, the most commonly used is an electromechanical engraving technique that uses an electromagnetic field to control a diamond carving knife. Since the invention of this technology in 1963, electromechanical engraving technology has been widely used for its excellent image reproduction quality, stable and reliable engraving quality, and high engraving efficiency.
From the basic principle (see Figure 1), electromechanical engraving technology uses sculptured electronic signals to control the electromagnetic field, which causes the deflection of the engraving tool lever under the control of the electromagnetic field. The engraving knife cuts into the copper layer of the gravure cylinder to obtain a gravure mesh hole. Different shades of image color, the intensity of the engraving signal is different, the driving force of the electromagnetic field is different, the depth of the carving knife cut into the copper layer changes with the depth of the image color. During the engraving process, the copper plating drum rotates, the carving knife vibrates at a frequency of several thousand times per second, and once the carving knife vibrates once, the engraving of a net spot is completed.
In terms of the resolution of the sculpted cells, this carving technology can achieve a number of engraving lines of 100-350 lines/inch, and practical applications generally use 175-200 lines/inch screen lines. Because each cell has a change in depth, the tone levels and color reproduction of the image are excellent.
However, electromechanical electronic engraving technology has no advantage in the engraving of text and fine graphics. Because the commonly used 175-200 lines / inch engraving resolution is not enough to perfectly reproduce the text outline, resulting in the emergence of sawtooth phenomenon. Although "Anti-aliasing" technology can be used to "fill in" the edge of the outline with some light-colored small cells to reduce the visual effect of jaggies, quality comparable to offset high-resolution laser recording cannot be obtained. This is because the resolution of the laser recording used in offset printing is between 1000 and 4000 dpi, and the resolution of commonly used laser recording is between 1,200 and 2,540 dpi, which can guarantee the outline quality of text and fine graphics. Figure 2 shows a comparison of text, line edge conditions, and laser recording resolution of a conventional electronic engraving gravure with a 1200 dpi offset text.
Ultra Fine Engraving Xtreme Engraving
In view of the limitations of conventional electronic engraving technology, if there are indeed some fine textual information that must be perfectly reproduced in the reproduced graphic text, the following method can be used to solve the issue: use a laser photo-setter to output the film in high resolution or use a laser to burn in high resolution The base paint was etched and then the gravure was made by etching. But the problem that comes with it is that the stability of quality will decline, which is related to the chemical process.
Gravure electronic engraving technology Organic electro engraving, laser direct engraving, laser ablation etching and electron beam engraving. Among them, the most commonly used is an electromechanical engraving technique that uses an electromagnetic field to control a diamond carving knife. Since the invention of this technology in 1963, electromechanical engraving technology has been widely used for its excellent image reproduction quality, stable and reliable engraving quality, and high engraving efficiency.
From the basic principle (see Figure 1), electromechanical engraving technology uses sculptured electronic signals to control the electromagnetic field, which causes the deflection of the engraving tool lever under the control of the electromagnetic field. The engraving knife cuts into the copper layer of the gravure cylinder to obtain a gravure mesh hole. Different shades of image color, the intensity of the engraving signal is different, the driving force of the electromagnetic field is different, the depth of the carving knife cut into the copper layer changes with the depth of the image color. During the engraving process, the copper plating drum rotates, the carving knife vibrates at a frequency of several thousand times per second, and once the carving knife vibrates once, the engraving of a net spot is completed.
In terms of the resolution of the sculpted cells, this carving technology can achieve a number of engraving lines of 100-350 lines/inch, and practical applications generally use 175-200 lines/inch screen lines. Because each cell has a change in depth, the tone levels and color reproduction of the image are excellent.
However, electromechanical electronic engraving technology has no advantage in the engraving of text and fine graphics. Because the commonly used 175-200 lines / inch engraving resolution is not enough to perfectly reproduce the text outline, resulting in the emergence of sawtooth phenomenon. Although "Anti-aliasing" technology can be used to "fill in" the edge of the outline with some light-colored small cells to reduce the visual effect of jaggies, quality comparable to offset high-resolution laser recording cannot be obtained. This is because the resolution of the laser recording used in offset printing is between 1000 and 4000 dpi, and the resolution of commonly used laser recording is between 1,200 and 2,540 dpi, which can guarantee the outline quality of text and fine graphics. Figure 2 shows a comparison of text, line edge conditions, and laser recording resolution of a conventional electronic engraving gravure with a 1200 dpi offset text.
Ultra Fine Engraving Xtreme Engraving
In view of the limitations of conventional electronic engraving technology, if there are indeed some fine textual information that must be perfectly reproduced in the reproduced graphic text, the following method can be used to solve the issue: use a laser photo-setter to output the film in high resolution or use a laser to burn in high resolution The base paint was etched and then the gravure was made by etching. But the problem that comes with it is that the stability of quality will decline, which is related to the chemical process.
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