How to realize flexible printing of high screen co

2022-08-16
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How to realize flexible printing of high-speed corrugated paper

release date: Source: interconnection

in industrial production, sometimes it is necessary to test and plan the production line, so as to maximize the use of the functions of the production line. How to realize flexible printing of high-speed corrugated paper? Determine the best solution that can not only be suitable for printing, but also reflect the effect of product design. China paper industry will analyze its key technologies for you:

1: determine the printing suitability conditions

first, understand the printing equipment. For example, the color number of the unit, the type and number of lines of the corrugated roller, the basic situation of the paper feeding system and the scraper system. There are also paper types, such as whiteboard or coated paper. If possible, a set of test plates for testing the printing suitability of the printer can be provided. It includes a ladder bar for testing the expansion of different line points of the flexo, a color block for measuring the field density value of the ink, a simple chromatography for overprinting different point proportions, yin-yang characters and straight lines of different font sizes, a separate module for measuring the chromatic error, a pressure bar for observing the printing balance pressure, and so on. The test printing plate is required to be completed under normal production conditions such as normal printing board, standard production water-based ink, normal printing pressure and speed. Of course, some printing conditions can be changed to get different test samples. Through the analysis of the test samples, we can get the printing suitability of this type of printer under normal conditions. We can get the point expansion, curve and field of water-based ink of each color. 1 Test method for ultraviolet light aging resistance of polyethylene: it is mainly used to detect the tensile strength and elongation at break density, hue value, point collision, influence of color sequence, reduction of fine lines, overprint error and printing balance pressure before and after light aging

combined with the above test data and the printing effect of the test sample, a set of color matching management system for this printer can be established, such as the establishment of point compensation curve for point expansion, the treatment and recycling of screen color and waste plastic in recent years, the correction of gannina curve, the color simulation and matching of proofing, etc

2: determine the plate making process and color separation scheme

in flexo plate making, the determination of color separation process scheme is a key factor, which plays a decisive role in whether high-speed wire products can be successfully printed to some extent. The color separation of flexible printing should use as few colors as possible and use as pure colors as possible to complete the superposition of colors, which is very helpful to printing and reduce costs

3: selection of the number of lines and angles on the printing plate

the number of lines on the printing plate is restricted by the number of lines on the ink transfer roller, and the ratio between the two is required to be more than 1:5. The 400L/in corrugation roller can achieve a maximum of 80L/in printing plate. If the number of lines is too high, it is easy to paste the plate and produce moire. Therefore, the higher the number of lines, the better. Moreover, the printing effect of 80L/in and 75L/in will not be much different in terms of fineness

the addition angle of flexo printing mainly adopts two angles: 7, 37, 67, 82, and 7, 22, 52, 82 according to the angle of the corrugated roller. However, since it is very likely to cause personal injury or even death, we should proceed from the actual situation of the product, and we can't cut across the board. For example, for monochrome hanging linear patterns, the hanging angle must be 45 degrees or 0 degrees, otherwise there will be obvious jagged edges on the hanging patterns. The selection of overlapping pattern angle should be based on the principle that the hue angle of the main tone of the product pattern is 30 degrees different. If the skin of the portrait is mainly yellow, the color difference between magenta and yellow should be more than 30 degrees; If the landscape is dominated by green tones, the color difference between cyan and yellow should be more than 30 degrees, otherwise moire will easily occur. Before plate making, conduct proofing simulation to determine the best addition method. Discrete points adopt certain additive technology, which increases the anti-counterfeiting of products

at present, the direct plate making system mainly adopts extremely high transfer technology, and images directly on the resin plate after color separation and assembly

digital printing plate has the advantages of complete dot type, extremely high light spots that are not easy to lose, low dot expansion rate, long step adjustment, large dots, and no paste. It is the best choice for flexo high-speed plate making

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