In the color box product printing process, in order to beautify the product packaging, protect the surface ink layer of the printed product, facilitate the transportation of the product, and enhance the added value of the packaged product, it is often necessary to coat the surface of the product after the printing process is completed. A bright, wear-resistant varnish film layer to increase the gloss and aesthetics of the printed product. The color box products can make the printed products have the effects of moisture, heat, wear and light resistance through glazing. The glazing process for color box prints is well received by the majority of color box printing factories and their users for its advantages of simple, fast, economical and practical technology. The glazing process is generally produced by a dedicated glazing machine. The production process requires multiple people to cooperate to complete, and the production cost is high. When I used to print some color box products that need to be polished in the printing workshop, I simply used the high-speed automatic printing machine of the letterpress to realize the process measures of integrating color printing, indentation technology and product polishing, which improved the economy. Benefits and product quality. Next, the author discusses some process technology control experience on how to use the automatic letterpress printing machine to polish the ordinary color box products. Selection of Toppan Automatic Printing Machine Model TL2640 two-color four-open letterpress rotary printing machine. This machine has good characteristics such as high production efficiency, good product quality, easy operation and fast operation. In particular, the machine can print two-color mechanical structure at a time, which is conducive to printing and glazing at the same time. For example, the color of the last color layout in the chromatic printing can be completed at the same time as the glazing process, so the production efficiency is high. TY401 four-turn one-turn platform printing machine and DT400 four-turn automatic platform printing machine. This type of relief printing equipment with round flattening structure is also an ideal equipment to complete the glazing process. The pressure of these two models is even and sufficient, and the design of the ink roller system is reasonable, which is conducive to the even coating of the varnish, which can better achieve the transition of the glazing process and the machine operation is also very convenient. [next] Selection of plate materials polished by letterpress The relief printing process is used for glazing, which is very convenient. As long as a solid plate is used, the varnish can be transferred to the surface of the printed product. The traditional relief printing plate material zinc plate and resin plate can be polished, but its adaptability is far better than the field version made of blanket. The author used the old blanket to make the relief printing field version, and achieved good results in process technology, which significantly improved the product quality and opened up new development prospects for the relief printing process. Similarly, the process is also suitable for glazing products. Because the surface of the blanket has good lipophilic properties, this is incomparable between the zinc version and the resin version. In addition, the solid version of the blanket has good flatness, soft texture, full of elasticity and viscosity, which is convenient for the uniform transfer and coating of the oil layer, and the process of polishing (imprinting) does not cause pressure bumps on the back of the product. satisfaction. Use a blanket to make a field version for glazing. The process is: according to the specifications of the printed sheet, cut a piece of blanket with the corresponding area and paste it on the bottom support of the plate with double-sided tape. After adjusting the pressure of the plate, you can For glazing, the method is very simple. 1. The machine must be cleaned. After the decoration product is printed, the hue of the printed version must basically match the original, which is the basic requirement of the plate printing process. This requires that the printed product should basically maintain the original printing hue after passing through a light and transparent oil layer. For this reason, it is important to check the technology before glazing. Before the glazing of the printed product, after the glazed plate has passed the proofreading pattern, there may be unavoidable thin ink on the plate surface and the rubber roller. Therefore, the ink fountain, rubber roller and glazing plate should be washed repeatedly until it is completely clean and clean. In this way, it is possible to prevent the varnish tip from being discolored due to unclean cleaning, which affects the ink color quality of the entire printed product. 3. Correct selection and reasonable adjustment of rubber rollers. For glazing with a printing machine, rubber rollers are an important part of product quality. The rubber roller should be soft in texture, intact on the surface, elastic and sticky, and have good transmission performance. The roller body must maintain a good roundness, and the shaft head and bearings should be free of wear and deformation. The ink roller and the ink roller should be adjusted to maintain a uniform contact state, and the height of the inking roller should also be adjusted to maintain a uniform contact condition with the plate to ensure uniform transfer and coating of the varnish. [next] 4. Make good use and adjustment of the ink fountain. Put the varnish in the ink hopper, and use aluminum clip (mold) to block the varnish to the ink fountain corresponding to the glazing plate. The unused ink fountain should be screwed properly. For the adjustment of the oil delivery volume, adjust the position of the ink fountain steel screw after adjusting the rotation angle of the ink fountain iron roller to the maximum limit. This adjustment can make the gap between the ink fountain steel sheet and the iron roller as narrow as possible. By increasing the rotation distance of the iron roller to meet the required oil amount of the layout, it can effectively prevent the oil leakage phenomenon caused by the too large gap between the steel sheet and the iron roller. 6. Drying of glazed prints. The printing machine is used for glazing. Since there is no matching drying device, it is advisable to use a paper drying rack to separate the appropriate amount of printed products for drying to prevent the products from sticking to each other. In this way, paper drying is more economical and applicable, and it can also ensure production efficiency and quality. If the stiffness of the printed product is good, such as white paper, the paper can be placed upright to dry, so as to avoid the heavy contact of the paper sides, which is helpful to prevent sticking. 7. Polishing treatment of crystallized printed matter. If the plate printing process is not properly controlled, for example, the product is left for too long, the printing ink layer is too thick, and the amount of dry oil is too large, it will cause crystallization on the surface of the printed product, so that the varnish is not stamped or printed. Afterwards, there are quality defects such as "pitting" on the layout. For this, 5% lactic acid can be added to the glazing oil, and the glazing can be carried out after stirring evenly, so that the vitreous crystal film on the surface of the printed product is damaged. It can evenly transfer to the surface of the printed product and form a bright oil film. In summary, the use of a letterpress automatic printing machine for glazing has the obvious characteristics of simple process operation, high production efficiency and low raw material consumption. In addition, this process can not only greatly save energy, but also speed up the production cycle, improve production efficiency, and reduce product costs. Therefore, this production process is still suitable for glazing of small batches and ordinary color boxes.
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The essentials of glazing operation and process technology control of letterpress printing machine.
2. Turn off the pad technology. The level of the glazing plate should be flat, so that the pressure of the plate is uniform, and the printing pressure should not be too light or too heavy. This requires that the bottom plate of the glazed version must be solid and flat, and the corners of the bottom plate should be at right angles and squared. This is the basic link to prevent bowing and virtual and solid appearance on the layout, and to ensure the quality of the mat. The process of pad operation is related to the problem of whether the varnish can be evenly transferred and coated. Therefore, it is necessary to master the process technology of the pad.
5. The deployment of varnish. For small batches of printed matter, only use bright paste plus appropriate amount of viscosity reducer, this is a simple method. It can also be made by proper mixing of bright oil and bright paste. The greater the proportion of bright oil, the higher the brightness of the product. In addition, according to the characteristics of the product, glazing paint and thinner can be used for glazing.
Introduction of process technology of glazing with letterpress printing machine