Single machine glazing is to use a special glazing machine to glaze the surface of the printed matter, that is, printing and glazing are carried out on their own dedicated equipment. Single-unit glazing has its own unique advantages in field polishing and other aspects, and has a high degree of flexibility. It can be matched with several different types of printing machines. In addition, it can meet different glazing requirements, provide a variety of special glazing effects, and have a wide range of applications. It can glaze commercial prints, such as corporate samples, calendars, annual reports, etc., as well as trademarks and various types. Packing products. The investment of single-unit glazing equipment is small, which is more suitable for professional post-press processing manufacturers. In order to assist the manufacturers to do stand-alone glazing, increase the added value of products, and improve the economic efficiency of the enterprise, we interviewed several experienced production line operators and related persons in charge, and asked them to discuss the problems and problems that occur in the stand-alone glazing production. Partial solutions are summarized. They are: Mr. Zhou Zhixiong, Minister of Production of Qingdao Haier Fengcai Printing Co., Ltd., Mr. Wu Yingbin, craftsman of Dongguan Hucai Packaging and Printing Co., Ltd., and Mr. Wang Dongjing, chief engineer of Baoding Xingliang Printing Factory. Thank you for their support. For the remaining unresolved issues, we look forward to discussing with you and welcome your letters and calls to express your opinions. Consumables and process parameters In the glazing process, there are many factors that affect the glazing quality of a single machine, such as glazing plate, glazing oil, printing materials, printing ink, glazing temperature, etc. 1. Impact of the polished version The glazing is divided into overall glazing and local glazing. The main function of overall glazing is to protect the printed matter and improve the surface gloss of the printed matter. Generally, roller coating is used; local glazing is generally emphasized on the printed matter. The graphic part of the image is glazed, and the high-gloss picture of the glazed part is compared with the unglazed part, which can produce wonderful artistic effects. Because there is basically no registration problem for the overall glazing, and the local glazing pattern must be accurately registered, the difficulty is relatively high, so everyone has talked more about the selection of the local glazing version. First of all, you should have a clear understanding of the structure of the glazing part of the local glazing products. According to the distribution of the local graphics, the size of the graphics, the thickness of the lines and the characteristics of the varnish (leveling is the most important), etc. Material selection. If the local fine pattern is glazed, it is not suitable to use resin plate or blanket as the glazing plate. Anilox rollers with different number of lines should be selected according to the product's requirements for glazing brightness. The thickness of the varnish must be well controlled. 2. The effect of varnish According to everyone, in the process of glazing, the most important factor affecting the quality of glazing is glazing oil. Therefore, we will start a discussion on the varnish, and put forward the matters that should be paid attention to when choosing the varnish according to the current situation of the varnish on the market to help you buy. For solvent-based varnishes and water-based varnishes, the process technology currently used by printing companies is relatively uniform and relatively stable and mature; for UV varnishes, the problems are relatively more. All three types of varnishes may have poor gloss, poor leveling, and poor drying. These phenomena are not only related to the quality of the varnish, but also have a great relationship with the operation. The gloss is poor, you should pay attention to the resin composition ratio of the varnish and the quality of the plate and glazing roller of the oiling machine during operation. The main reason for the poor leveling is that the drying time is too long or the light power is too large, and the varnish is too viscous. If the varnish is not dried well, the varnish will not be dried thoroughly enough, and there will be no bottom. That is to say, the surface is dry and the inner layer is not dry. You need to adjust the drying time and light intensity. At the same time, you should also pay attention to the viscosity and varnish Dilution. In addition, the crystallization of glazing oil has a relatively large impact on the glazing quality. Because the printed matter has been placed for too long, the area of ​​the bottom ink of the printed matter is too large, and too much dry oil is added, the varnishing will not be applied or the phenomenon of "face" and "pitting" will occur. Generally, 5% lactic acid can be added to the varnish and used after stirring. And these three different glazing oils will have different problems during the drying process. Solvent-based varnish will have an odor during drying. The oily solvent contains resin and toluene. After thermal curing, the alcohol glazing paint and solvent will play a chemical role on the ink layer. The solution is to increase the intensity and speed of infrared and thermal curing. Appropriate heat energy and the control of the operating speed can promote the volatilization of the solvent diluent, improve the drying effect, reduce its residual amount, reduce odor and discoloration. During the drying process of water-based varnish, the chemical effect of the thinner on the ink layer and the paper coating and the influence on the smoothness of the paper surface should be avoided to further avoid pollution to the environment. UV varnish uses the spectral range of the ultraviolet light source, the power of the light source, the corresponding transmission width and the effective curing speed to complete the drying. If there is residual solvent after curing, oil will be lost. Therefore, attention should be paid when curing. The varnishes currently on the market mainly have the following problems: (1) The range of dilution ratio is too large, it is difficult to grasp the best point in operation; Pay attention to the following items when choosing varnish: (1) Understand the types, properties, effects and changes of varnishes when preparing with other solvents; 3. The influence of printing materials The influence of printing materials on glazing is manifested in two aspects. One is unprinted paper, which mainly shows the influence of paper smoothness on glazing quality. Papers with high smoothness have a significant effect after glazing; papers with low smoothness have a poor effect after glazing because the varnish is almost completely absorbed by the rough surface. To solve this problem, you can apply primer or glaze twice before glazing. In addition, the paper is too thin or the paper quality is too bad to affect the gloss. The paper is too thin and easy to wrinkle, the paper is too poor, the varnish will leak, and the gloss is not good. The second is the printed paper, mainly in the following aspects: (1) If there are talc powder, additives and other substances on the surface of the printed matter, it needs to be treated before being glazed. 4. The impact of printing ink The printing inks used in products that need to be polished after printing must have solvent resistance and heat resistance, otherwise the graphics and text will be discolored or wrinkled. When selecting printing inks, the following principles should be adhered to: select inks that are resistant to alcohols, ester solvents, acids and alkalis, discoloration over time, have good gloss, and have good adhesion to paper. [next] Human Factors When glazing the product, the operator must understand the glazing requirements of the glazing product, be familiar with the mechanical properties of the glazing machine and operate in strict accordance with the operating regulations. The parameters of the varnish must be reached during operation before the production can be officially started. The correct operation method can improve the efficiency in the production process, reduce the waste of time and resources, and the quality is further guaranteed. The operation method has a direct influence on the glazing effect: (1) The temperature and time control of the drying system of the glazing machine does not meet the requirements, which will cause the drying of the glazing oil to be incomplete, and sticky flowers will appear after the printed paper is overlapped; the excessive drying will cause the glazing oil to level on the surface of the printed product Bad or burst. Since the operator plays a more important role in the operation process, the operator is required to: (1) It must be rigorous, prudent and meticulous during the operation; In addition, the operator must take different measures according to the type, thickness and quality of the printed product paper, the depth of the ink color, the dryness of the surface and the amount of powder sprayed to ensure the glazing effect. Improper operation methods will directly affect the glazing effect. If the temperature is too high, the paper will be deformed, yellowed, brittle, or even vitrified. If the temperature is too low, the brightness will not be enough, and it will stick. The quality of light. 5. Influence of temperature The temperature of the glazing is generally controlled at 18 ~ 20 ℃, which can achieve better results. If the coating temperature is too high, on the one hand, it will cause waste of resources, and on the other hand, it will also affect the printing materials. When the temperature is too low, the glazing oil is easy to solidify, and the surface film layer of the glazed product is uneven. Therefore, the varnish should be stored in a heat preservation place; if the temperature of the varnish is too low, a hot solvent can be added. Unresolved issues In addition to the problems mentioned above during the coating process, front-line operators also encountered some difficult problems, including online coating and stand-alone coating. They asked us to seek help from our readers, and hope that everyone can provide suggestions and solutions to solve existing problems, jointly promote the improvement of glazing quality, and print more exquisite products. Problem 1: When performing online glazing on plain surface laser-coated cardboard, the varnish is dry and opaque, and the phenomenon of severe sticking of flowers occurs. At present, the major domestic varnish manufacturers and agents are looking for solutions, which have not been solved so far. Question two: After a company's product is polished, the light film layer is slightly yellow and the gloss is not enough. After the coated UV varnish is cured, the color of the printed product is unstable and discolored, which is very different from the original. For example: 200g / m2 coated paper is coated with UV varnish after mounting, and the color changes greatly after printing for less than a month, especially the blue and red colors are more obvious. This kind of UV glazing is to make primer and then apply UV varnish, and the amount of gluing used in the laminating process is also moderate.
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(2) There is a general problem of unstable leveling, mainly manifested by obvious oil marks on the edges when locally glazing;
(3) The gloss of varnish is unstable;
(4) The drying performance is difficult to control, and the drying degree of different batches of the same varnish is different;
(5) The hot stamping performance of varnish is unstable, especially UV varnish;
(6) Varnish has an odor;
(7) The viscosity is large (easy to stick), the most important thing is that it can not pass the friction resistance test;
(8) The environmental performance of varnish is not very good.
(2) Choose the varnish with suitable performance according to the substrate and ink surface performance of the substrate;
(3) Pay attention to the drying performance of the varnish. Does the drying temperature range and drying time affect the substrate?
(4) It is necessary to consider the adaptability of the post-processing of the glazing materials, such as hot stamping performance, friction resistance, pressure resistance during die-cutting of concave and convex indentations, etc .;
(5) When trying a batch of varnish, you can check whether the varnish is tacky and whether the color of the printed pattern changes by heating;
(6) Varnish with high transparency and low odor should be selected.
(2) When printing gold, silver ink or large-area solid printing (such as black, dark brown, dark green, etc.), in order to avoid adhesion, a large amount of powder spraying is required. Before the single machine is polished, it must be wiped off and the powder sprayed must be cleaned before being applied Light.
(2) Pay attention to the selection of plate materials when glazing. Improper selection of plate materials will directly affect the brightness and thickness of the glazing, which will not meet the product quality requirements.
(3) It is not strictly diluted according to the dilution ratio of the varnish, which has a direct impact on the drying performance, brightness, leveling, wear resistance, etc.
(2) The operation must be in place, and the gloss and color should be tested more;
(3) Enhance product quality awareness;
(4) The problems that arise during the work must be resolved quickly and accurately.
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