Introduction to the process technology of glazing

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In the printing process of color box products, in order to beautify the packaging of products, protect the surface ink layer of prints, facilitate the transportation of products, and enhance the added value of packaged products, it is often necessary to coat a layer of bright and wear-resistant varnish film on the surface of products after completing the printing process, so as to increase the gloss and beauty of prints. Through glazing, the color box products can also make the printing products have the effects of moisture-proof, heat proof, wear-resistant and sun proof. The glazing process of color box printing products is deeply welcomed by the majority of color box printing factories and their users because of its simple, fast, economical and practical advantages

the glazing process is generally produced by a special glazing machine. The production process requires the cooperation of many people, and the production cost is high. When the author used to print some color box products that need polishing in the printing workshop, he simply used the relief high-speed automatic printing machine to realize the process measures of color printing, indentation process and product polishing, which better improved the economic benefits and product quality. Next, the author talks about how to use relief automatic printing machine to polish ordinary color box products, and some experience of process technology control

selection of relief automatic printing machine model

tl2640 two-color four open relief rotary printing machine. The project product has achieved the goal of high efficiency, low resistance and long life. The machine has good characteristics such as high production efficiency, good product quality, simple and fast operation. In particular, the mechanical structure of the machine, which can print two colors at one time, is conducive to printing and glazing at the same time. For example, the last color in the chromatic printing can be completed at the same time with the glazing process, so the production efficiency is high

ty401 four open one rotary platform printer and dt400 four open automatic platform printer. This kind of letterpress decoration and printing equipment with round flattening structure is also an ideal equipment to complete the glazing process. The pressure of these two models is uniform and sufficient, and the design of ink roller system is reasonable, which is conducive to the uniform coating of glazing oil, can better realize the transition of glazing process, and the machine operation is also very convenient

the plate material polished by relief printing machine is selected

the relief printing process is used for polishing, which is very convenient. As long as a field plate is used, the glazing oil can be transferred and covered on the surface of the print. Traditional embossing plates, such as zinc plates and resin plates, can be polished, but their suitability is far better than the field version made of rubber blanket. The author uses the old rubber blanket to make the embossing field version, which has achieved a good effect in the process technology, so that the product quality has been significantly improved, and opened up a new development prospect for the embossing process. Similarly, this process is also applicable to the glazing of products. Because the rubber sheet surface has good lipophilic performance, which is unmatched by the zinc version and the resin version. In addition, the rubber blanket field version has good flatness, soft texture, elasticity and viscosity, which is convenient for the uniform transfer and coating of the oil layer, and the polishing (embossing) of this process will not cause pressure bumps on the back of the product, and the appearance quality of the product is relatively satisfactory. The process of making a field version with rubber blanket for glazing is as follows: cut a piece of rubber blanket with corresponding area according to the size of the printing sheet, paste it on the bottom support of the printing plate with double-sided tape, and then adjust the pressure of the printing sheet, and then polish it. The method is very simple

highlights of glazing operation and process technology control of letterpress

1. The machine must be cleaned. After the printing of decoration products, the hue of the printed page must be basically consistent with the original, which is the basic requirement of the printing process of the maximum amplitude of the actuator: 75mm (the stroke of the oil cylinder is 0 ⑴ 50mm). This requires that the printed matter, after passing through a layer of bright and transparent oil layer, should also basically maintain the original printing hue. Therefore, it is very important to check the technology before glazing. Before the printing is polished and after the polished plate passes the pressure plate sample, the plate and cot may inevitably have faint ink invisible to the naked eye. Therefore, the ink fountain, rubber roller and polishing plate should be cleaned repeatedly until they are completely clean. In this way, it can prevent the color deviation of the polishing tip due to unclean cleaning, which will affect the ink quality of the whole print

2. Check the technology of plate cushion. Polish the height of the page to be flat, so that the pressure of the page is uniform, and the printing pressure should not be too light or too heavy. This requires that the bottom support of the polished plate must be solid and smooth, and the corners of the bottom support should reach a right angle and squareness, which is the basic link to prevent the bow and virtual solid shape of the plate and ensure the quality of the pad plate. The pad operation process is related to whether the polish can be solid and whether it can be consistent with the alignment accuracy, so it is necessary to master the pad technology

3. Correct selection and reasonable adjustment of cots. Cots are an important link that affects the quality of products when polishing with a printing machine. The rubber roller shall be soft in texture, intact on the surface, elastic and viscous, and have good transmission performance. The roll body must maintain a good roundness, and the shaft head and bearing should be free of wear and deformation. The ink roller and the inking iron 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 layout, so as to ensure the uniform transfer and coating of the glazing oil

4. Do a good job in the use and adjustment of ink fountain. The glazing oil is put into the ink bucket, and the Aluminum clip (mold) is used to isolate it, so that the glazing oil is limited to the ink bucket corresponding to the glazing plate, and the screws of the unused ink bucket should be properly tightened. For the adjustment of the oil delivery volume, the position of the ink bucket steel plate screw should be adjusted slightly after the rotation angle of the ink bucket iron roller is adjusted to the maximum limit. Such adjustment can minimize the gap between the ink bucket steel sheet and the iron roll, and increase the rotation stroke of the iron roll to meet the oil volume required by the layout, which can effectively prevent oil leakage due to the large gap between the steel sheet and the iron roll

5. The deployment of glazing oil. For small batches of printed matter, it is a simple method to only use brightening paste and an appropriate amount of viscosity reducer. It can also be processed into various parts by properly mixing and blending gloss oil and gloss paste. The larger the proportion of gloss oil, the higher the brightness of the product. In addition, according to the characteristics of the product, glazing paint and diluent can be used for glazing

6. Drying treatment of glazing printing materials. The printing machine is used for polishing. Since there is no supporting drying device, it is advisable to use the paper drying rack to place an appropriate amount of prints separately for drying, so as to prevent the products from sticking to each other. In this way, paper drying is more economical and applicable, and can also ensure production efficiency and quality. If the stiffness of the printed matter is good, such as white paper, the paper can be placed vertically in the air. In this way, the mutual pressure contact of the paper surface can be avoided, which is conducive to preventing adhesion

7. Printing crystallization glazing treatment. If the plate printing process is not properly controlled, such as the product is placed for too long, the printing ink layer is too thick, and the amount of dry oil is too much, the printing surface will produce crystallization phenomenon, so that the polishing oil pressure cannot be printed, or after printing, the plate will have quality faults such as pockmarks. For this, 5% lactic acid can be added to the polishing oil, which can be polished after being stirred evenly, so that the glass crystalline film on the surface of the printing is damaged, Glazing oil can be evenly transferred to the printing surface and form a bright oil film

to sum up, the use of relief automatic printing machine for glazing has the remarkable 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 applicable to the glazing of small batches and ordinary color boxes

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