Mesh relief printing process technology control

Toppanese printing is a kind of technology with strong production technology. The quality of such products depends on the degree of correctness of the operation technology in the production process, in addition to the production hardware factors. Therefore, it is necessary to print a relief pattern and ensure the quality of product printing. We must pay attention to the reasonable control of production process technology.

1. Awareness of plate material and its characteristics

At present, there are mainly three kinds of plates for printing textured prints, namely zinc plates, copper plates and resin plates. The zinc plate is made of zinc metal plate, and its thickness is various. Among them, the thickness of 1~1.5mm is suitable for the production of the cable screen plate and the letterpress plate with lines. Because the zinc plate material is relatively brittle and has poor abrasion resistance and plasticity, it is mostly used for the production of rough mesh reticles below 100 lines, so that it is compatible with its material properties. The copper plate made of copper plate material has better abrasion resistance and higher fineness, and is more suitable for making an anilox plate. The price of copper plate material is more expensive than that of zinc plate, and it can be applied to fine products with high printing quality requirements in order to achieve the best results. The photosensitive resin plate (solid type) is a new type of relief plate material developed after the metal plate. It is also suitable for the flexographic printing process. This plate has the characteristics of light weight, fast plate making speed, soft plate texture, elasticity, and printing pressure. Small, high printing durability, high printing rate, suitable for printing large area of ​​the net version, field version of the structure of the product, printing pressure, printing ink quality and quality are better.

2. Put a good pre-press process technology to ensure product printing quality

Releasing process color prints, often using three- or four-color printing. However, in the daily production, more monochrome net prints are available, or prints with simple texts, real maps, and line versions coexist. Among them, multicolor overprint products are more difficult to print, and if the prepress process is not properly handled, it will directly affect the color effect. Under normal circumstances, ordinary color printing products with low quality requirements can use a three-color printing process. However, due to the lack of three-color version of the black version of the monochromatic version, the print layout contour level is not natural, soft, so the high quality requirements of the product using four-color version of the process of printing, printing better. Of course, this can only be achieved when the number of printing plate lines and the angles of the various printing plates are accurate. The higher the number of network lines, the finer the network points, the richer the graphic hierarchy. The process experiment shows that the higher the printing plate line, the smoother the paper must be in order to ensure the printing quality of the product. Therefore, for fine products printed with coated paper and glass cards, it is appropriate to consider making 150-200 textured prints for printing. Paper with a smooth paper surface can be made with 120 to 150 lines of an anilox version. The printed rough paper, such as newsprint, low-grade offset paper, and stickers, can be used to make an anilox version of 60 to 100 lines. In addition, the reasonable choice of the angles of the various printing plates is also an important part of guaranteeing the printing quality. Because only the difference in the angles between the screens of different colors is different, after printing, a layered and comfortable color effect can be exhibited. Therefore, normally, the yellow plate is generally made at 90°, the black plate is made at 45°, and the cyan plate and the red plate are made at 15° or 75°. However, because the 45o cable angle is the most comfortable visually, the screen angle of the 45o cable is relatively stable and not rigid. It is the best cable angle. Therefore, for the original manuscripts that are mainly printed on portraits, since the screen is mainly based on magenta tones, the magenta version can be made 45°, the yellow plate can be made 90°, and the cyan and black plates can be made 75. ° or 15 ° printing more appropriate. For the landscape manuscripts mainly printed in cyan tones, the cyan plate can be made 45°, the yellow plate can be made 90°, and the black plate and the magenta plate can be printed 15° or 75°. .

3. Turn off the good printing operation technology to improve the product printing quality

1 Care should be taken to keep the plate in place to prevent it from being damaged. Mesh version of the network is relatively small, can not afford to rub and pressure. Therefore, when printing plates are moved and extracted, they should be handled with care. Several pieces of printing plates must be laid on top of each other with a smooth, soft paper to protect the top of each plate to prevent scratches on the platen.

2 to pay attention to master the position of the plate. When loading the plate, try to place the plate in the centered area to ensure uniform printing pressure. Because the center of the platen and the drum is the largest part to bear the printing pressure, the entire plate can be subjected to a more balanced printing pressure, thereby obtaining a better printing quality effect.

3 It is necessary to put the quality of the good sticker. The rotary press of the round press structure shall be used as accurately as possible to align the position of the printing plate in a one-time manner. That is, the reticulated plate of the attached roller shall not be disassembled and re-adhered so as to avoid the phenomenon of distortion of the track due to the folding. Affect the overprint accuracy of the product and the cleanliness of the blank layout, it should be carefully and accurately paste the plate according to the squares and marks on the roller. The use of circular press flat printing machine anilox version, paste the plate version of the support should use the metal plate, so that its four sides more right angles, the plate is more solid, not easy to make the plate appear bow phenomenon, and the pressure is also tight , uniform, can get a good imprinting effect.

4 to choose, adjust the ink roller. The ink color of an anilox printing product mainly depends on the ink application effect of the ink roller. Therefore, the inking roller should adopt a good degree of circle and flexibility, and the surface of the colloidal surface should not have scratch marks on the plate lines. At the same time, it is required that the level of the ink roller should be adjusted accurately, and the contact pressure with the ink roller should be appropriate and uniform contact conditions should be maintained so as to avoid the problems of ink transfer or ink application and ensure the printing quality of the dots.

5 It is necessary to put a good pad version of the technology. The clear dots originate from uniform printing pressure, while the letterpress version of the relief process is an effective measure to achieve uniform printing pressure. Under the condition that the under pad is even, the upper pad is the key to ensure the quality of the printed product. Therefore, a piece of printing paper is printed with a thin paper of about 35 g, and then the dark tone pattern of the printed version is dug out and adhered to the corresponding padding. Darkly imprinted on blots to achieve a uniform dark and bright layout with clear printed dots.

6 It is necessary to turn off the technology of the lining process. The lining is the medium for imprint transfer, which greatly affects the printing quality of the product. The soft texture of the lining makes it easy to enlarge and distort the dots. When the lining is too hard, it is easy to make the screen dot wear. Therefore, with a neutral stiffer pad, the printed anilox version is more appropriate. It is also very important that the lining thickness be reasonably grasped. If the lining is too thin or too thick, it is easy to produce misprints. Therefore, the thickness of the lining must be determined according to the technical parameters of the equipment specifications. In addition, the lining of the bolster should be firm and firm, and there should be no loose conditions such as loosening and kicking, so as to avoid overprinting and ghosting quality failures.

7 We must set the printing rules to ensure the accuracy of product overprinting. Overprinting of the netted layout product should be performed once and for all in the position of the front gauge and the side gauge. When overprinting, the needle position (regulation) should not be adjusted too much. Because of the unevenness in the paper edge after cutting, in this way, if the rules are accompanied by a wavy or beveled edge that is not visible to the naked eye, once the positions of the front gauge and side gauge are moved, the overprint will not occur. Qualitative diseases. Therefore, the pin position of the first color printing is determined, and afterwards, the various colors should preferably be overprinted according to the original rule position.

8 To use and mix the ink properly. The same batch of products should be printed using the same type of ink to ensure the consistency of the print before and after the hue. According to the difference in the characteristics of the paper, adjust the viscosity and consistency of the ink. Due to the difference in ink absorption of paper and the temperature, the original ink with high concentration, poor fluidity, and high viscosity needs to be diluted and formulated to enhance the ink flowability and reduce the viscosity, thereby ensuring the normal ink transfer and Ink effect. However, the ink cannot be adjusted too thin so as not to lighten the hue of the ink and cause the disadvantages of the dot print expansion.

9 It is necessary to arrange the printing sequence correctly and improve the quality of the product. Printed screen printing layout scientifically and reasonably arranges the color sequence and plays an extremely important role in ensuring the printing quality. Printing two-tone reticulated version is generally printed light color, dark color after printing. If the two colors are not affected by printing one after another, dark colors can be printed first and light colors can be printed afterwards, so that the printing color effect is better. If printing three-color, four-color textured prints, should try to consider the color version of the poor transparency of the first printing, transparency and strong color printing. If the print layout is mainly based on warm colors, it may be printed in blue and black first, followed by yellow and magenta. The printing of cold-tone-based layout, such as the forest, the sky, etc., should be printed yellow, magenta, and then printed black and cyan, printing better.

4. Several failures that are easily encountered during the screen printing

1 Print layout outlets have expanded. When printing an anilox version, if the printing pressure is too heavy; the texture of the lining is too soft or does not hold tightly, there is a phenomenon of virtual looseness and kicking; the texture of the printing plate is too soft and the bowing phenomenon occurs in the loading plate; the ink is too thin, If the coating amount is too large, or an excessive amount of an anti-sticking agent is added to the ink, the screen points of the printed product may easily be enlarged. Therefore, when printing an anilox version, light pressure printing should be used as much as possible; printing plates can be printed with solid resin plates or copperplates that are hard to wear and compressively deformed; the resin plate's post-exposure time should be sufficient, and the curing temperature and time should be appropriate. The liner should be made of a neutral, hard material and care should be taken to tighten the inner and outer liners. To print an anilox plate using a platen press, use a flat, solid, four-sided, straight-edged metal plate material to prevent the bow from sticking after the plate is fastened; adjust the proper ink density and coating The amount of cloth, and try not to add other auxiliary materials in the ink to ensure the printing quality of outlets.

2 printing layout network is not clear. When the surface of the lining is uneven, the position of the roller is improperly adjusted; the roller is in an excessive condition; the coating amount of the ink is too large; the ink is too thin or too thick; when the pad is not uniform enough, it is easy to make local The imprinting on the layout will produce a pale or blistering phenomenon, and corresponding measures should be taken to correct it.

3 color difference appeared on the ink sheet. If there are mechanical problems, such as the front regulation, side regulation, delivery, teething and other parts of the work process, there is instability, abnormal phenomenon; paper surface strength is poor, easy to produce powder, fluffing, and due to the rules of the paper edge Wavy, the position of the front gauge or side gauge when overprinting was adjusted, and the presence of these situations easily leads to misprints and color differences. In addition, the use of different brands, different batches of three primary colors ink, due to the differences in the hue, are likely to cause the production of color differences. Therefore, the process of printing should be strictly controlled and controlled to prevent and reduce the chances of printing color differences.

To sum up, as long as the various aspects of the screen printing process are carefully taken into account, and the corresponding production process measures are scientifically and reasonably formulated according to the characteristics of the products and printing conditions, not only the printing quality of the products can be guaranteed but also effective. Improve production efficiency and increase the economic efficiency of enterprises.

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