The pre-printing of gravure printing carton is to pre-print the corrugated carton into the corrugated cardboard before using the gravure printing technology on the wide-web paper (carton paper), and then print the paper on the roll. The upper corrugated cardboard production line is made into corrugated box board, and then die-cutting and creasing is made into a box shape with a die-cutting machine. At present, 30% of the total output of corrugated cardboard boxes in some developed countries such as Europe and the United States is using pre-printed new technology. With the rapid development of China's paper product packaging industry, in recent years, many customers have stabilized carton factories such as Mengniu, Budweiser, Qingdao Beer has set its sights on new pre-printing technology. With the stable design and consumption of corrugated cardboard boxes for beverages, beer, home appliances and food, the production of high-end color corrugated cardboard boxes by roll paper pre-printing will become the future packaging Industry trends. ◠Roll paper preprinting is better than flat sheet preprinting At present, the vast majority of color cartons in China use flat sheet offset printing pre-printing. The process is as follows: cut the roll paper into a single sheet of paper → offset printing a single sheet of paper → simultaneously using a single-sided machine to roll two-layer corrugations Cardboard → facial paper and single-sided corrugated board mounted on the veneer or veneer veneer → die-cutting and creasing forming → nail box / sticking box The process flow of pre-printing technology for web gravure printing is: gravure printing machine printing surface paper roll → cardboard line production and cutting into three-layer (or five-layer) cardboard → die-cutting indentation molding → nail box / sticking box So why do you need gravure preprinting? There are two main reasons, one is that gravure printing can easily provide high-quality color prints; the second is that the electronic engraving technology makes the production cycle and cost of metal plate rollers greatly reduced, close to or even lower than flexo. Moreover, Shaanxi Beiren has produced a high-speed wide-format paper gravure machine at a price only one-third of that of imported flexographic printing presses. The use of gravure pre-printing may be more suitable for the reality of China's packaging companies. ——A higher printing quality can be obtained and the adaptability is wider. Pre-printing uses a gravure printing machine or flexo printing on a smooth paper surface. Compared with post-printing using a printing slotting machine to print on an uneven cardboard surface, it can perform fine color printing with richer layers and brighter colors, and Printing quality will be more stable and reliable. ——Corrugated cardboard can get the highest strength, because pre-printing does not need to imprint the cardboard after it is formed, which can avoid corrugated deformation and weaken the strength of the cardboard. After corrugated cardboard printing and slotting machine is used for printing, because each color printing will cause corrugated cardboard to be more or less deformed, and the more colors, the greater the impact on the corrugated cardboard deformation. ——High production efficiency, easy for production management, and low scrap rate. Pre-printing has become an important trend in corrugated cardboard printing, especially the printing of high-end carton (including large and special-shaped carton). Compared with the traditional color offset printing method, the production method using gravure printing carton pre-printing has the following significant features: --high productivity. The printing speed of gravure printing web is up to 150-200m / min, which is basically matched with many corrugated cardboard production lines in China, which is shorter than the offset printing and veneer mounting tile of traditional flat sheet paper, with low labor cost and high efficiency. ——The color carton produced by gravure printing pre-printing can obtain high-quality ink-printed products. Due to the high accuracy of gravure printing, no more than 0.2mm, gravure printing can also complete printing and varnishing at one time. Up to 300 lines, the amount of inking ink is larger than other printing methods, up to 4.5-6g / m2, the ink color of the printed product is full, soft, bright and firm, and there is a sufficient drying system for each color after gravure printing. Therefore, under the premise of selecting paper with a high surface smoothness for printing, gravure printing can obtain a high quality of ink printing. Most cigarette packs are products obtained by paper gravure printing. At present, domestically produced paper gravure printing inks are relatively mature, and domestically produced water-based paper gravure printing inks that can meet the pre-printing requirements of corrugated cardboard lines can fully meet the 180 ℃ high temperature and friction of hot plates on the corrugated cardboard production line. ——Can carry out large-format multi-color printing. The maximum size of traditional color offset printing is generally up to 1.2 × 0.9m (completion sheet), and most of them are four-color printing. The maximum material width of the unit-type gravure printing machine for carton pre-printing is 2.5 meters (Shaanxi Beiren Printing Machine Company) At present, we have produced various specifications of pre-printing machines (1300mm, 1650mm, 1800mm, 2000mm, 2200mm, 2500mm and running well). The printing color number can reach 4-10 color groups. At the same time, special inks such as gold ink and silver ink can also be processed. print. ——It is more suitable for long batch printing in large quantities. The pre-printed plates are made of steel chrome-plated electrogravure gravure plate, and the number of printing resistance is 3 to 4 million prints, which reduces the time of plate change, and is especially suitable for large-volume long-form printing. ——The corrugated box produced has higher strength. Since the production of corrugated cardboard boxes for pre-printing is completed on the production line, there is a certain heating molding time during the production. The final corrugated cardboard boxes produced have high strength, and can avoid uneven glue coating and carton ribs generated during the production of the veneer machine. , Cardboard warpage and other phenomena. ◠Carton pre-printing production equipment and process ——The main equipment for carton pre-printing is a large-unit gravure printing machine, and its auxiliary equipment is the computer-controlled cross-cutting and slitting of the corrugated paper production line. The pre-printed facial paper is installed on the hanging surface station of the corrugated cardboard line, after sizing, veneering, flattening, drying, cutting and other processes, and finally made into colored cardboard, after die-cutting, sticking the box, etc. The manufacturing process completes the carton production. ——The requirements of corrugated board line for pre-printing of carton. The important configuration of the gravure printing carton pre-printing production line is the computer cross-cutting on the corrugated cardboard production line, that is, the cross-cutting recognition control function must be installed on the cross-cutting knife of the corrugated cardboard production line. Its main control principle is to identify corrugated cardboard by the photoelectric eye The cross-cut mark on the printed pattern transmits the time when the cross-cut mark reaches the photoelectric eye to the control computer, and then the control computer controls the time of the cross-cut, thereby accurately cutting the corrugated cardboard at the boundary of the pattern. At present, domestic and foreign cross-cutting machine manufacturers can install this function for carton factories, and the cross-cutting precision can be controlled within 0.5mm. At present, the corrugated cardboard production line currently produced in China can be installed with computer cross-cutting devices according to customer requirements. ——Ink and Varnish: The ink used in pre-printed gravure printing machine is mainly alcohol-soluble ink or water-based paper special gravure ink. When the pre-printed paper is flattened and dried in the corrugated paper production line, the ink used is required to have high temperature resistance and friction resistance, otherwise the color surface will be drawn or dragged. At present, the "Tianshi" brand ink produced by Tianjin Toyo Ink Factory can meet the gravure printing of water-based paper. Its cost is low and pollution-free, and it meets the national environmental protection requirements. Compared with water-based inks and offset printing inks, the pre-printing ink for gravure carton produced by Shanxi Jingke Industry and Trade is based on cellulose as the main solvent. Compared with water-based inks and offset printing inks, this ink has bright color, high gloss and abrasion resistance, and is resistant to 180 ℃ -250 ℃ high temperature, good printing adaptability, clear printing pattern, delicate color performance, etc. At the same time, it has excellent adhesion to most printed surface. Some domestic manufacturers of varnish use the high temperature resistant varnish of American Cprecision In & Technology. Some domestic brands are also widely used, and the effect is also very good. ——Printing plate: The pre-printed printing plate is made of steel chrome-plated electrogravure gravure. The number of screen lines of the gravure plate can reach more than 300 lines. It is completely suitable for field plate printing and dot-gradation printing with color tone transition. In general, the gravure of plastic printing is deeper when engraving. The price of gravure platemaking has been reduced from 0.7 yuan / cm2 to about 0.35 yuan / cm2, which is close to flexo, and the number of gravure printing is 3-4 of flexo. Times, up to 3 to 4 million prints, the glazing roller can use a fixed number of screen rollers, using shaftless transmission. At present, there are many domestic plate-making manufacturers, such as Shanghai Ocean City, Southern Plate-making, Sanmenxia Lanxue and other manufacturers have reached the international advanced level. ——Paper: The gravure preprinted printing material must use coated white paper with good surface smoothness, strong printing adaptability and stable moisture content (6% -7%). Imported coated cow cards and domestic gray bottom whiteboard can meet the paper matching requirements of high-grade color corrugated box facial paper. The Finnish M-REAL forestry company is well-known in the world for the production of coated paper with high hygiene standards. 185g of coated paper has been widely used in domestic pre-printing machines. The quantitative range of paper is 150g-350g / m2. Mead Paper has been used in the United States 500 grams of raw wood pulp coated cattle cardboard gravure printing carton and canned beer portable carton, the strength exceeds corrugated carton. ◠Problems and solutions The printing products of the paper concave machine include decorative paper, bubble gum paper, beer beverage boxes, cigarette boxes, medicine boxes, milk boxes and fruit boxes, household appliances and other preprinted paper rolls. They are characterized by exquisite design, bright colors and large demand. Aiming at some common problems in the current application process of paper gravure machine, there are the following solutions for reference. Wrinkling: The tension of the high-gram weight preprinted paper roll is about 50kg, which is more difficult to control than the film (10kg) and thin paper (25kg). When the moisture is uneven and the thickness is uneven, a larger tension change will cause the paper to swing laterally. Wrinkles are formed on the surface of the printed product. The pre-heating device installed in the paper concave machine helps to reduce the tension change caused by the loss of water (the moisture is too low, install a humidifier); if the deviation adjustment flat roller is added, it will help the paper roll to be as flat as possible when feeding , The swing is reduced. Ink drawing: In addition to the temperature-resistant ink and varnish mentioned above, the latest air-cushion heating plate heat conduction control system can reduce the heating temperature and the strength of the cardboard when it passes the hot end. The process is that an air ejection channel is provided in the gap between the heating plate and the cardboard, which can eject the air in an instant, forming an air film to support the cardboard, and avoid the defects such as scratches and ink drawing caused by excessive heating and compression of the cardboard. Lu Bai: Mainly due to the dust on the surface of the paper roll and the blocking of the ink. Install the dust removal and explosion-proof electrostatic ink absorption device in the field printing group to blow the dust separately, improve the inking effect, and reduce the loss of dots. Spiral winding: The gravure printing machine for pre-printing should use a closed-loop control system to ensure the control of the tension taper. Uneven edges: Uneven edges can be added to the cross-section, a backup pressure roller (receiving rubber roller) can be added to expel the air from the paper roll to eliminate surface static electricity. swing. The installation of PLC computer correcting device can also help alleviate the uneven edge, another way to solve the uneven edge is to rewind offline. Paper roll overlap: Improper paper roll overlap during printing will cause downtime and downtime, and affect the consistency of the printed product. The paper can be connected by zero docking without interrupting the printing process. At present, the gravure printing machine for carton pre-printing produced by our company mainly has the following characteristics: (1) High printing speed and high overprint accuracy. The printing speed of this series of models is 150-200 m / min, and the overprint accuracy is ± 0.2 mm in the longitudinal direction (automatic registration system tracking, normal printing) and horizontal ± 0.2 mm (manual control) (2) Large printing area and good printing quality. (3) Printing and oiling can be completed at one time. This series of models can realize 4-10 color ink printing, and can be completed at one time with varnishing. The coating unit is driven by a separate motor, and a coating roller different from the diameter of the printing plate roller can be used, saving costs. (4) Use alcohol-soluble environmentally friendly ink or environmentally friendly ink to print. This series of models is equipped with an independent intelligent drying system. The fully enclosed oven and heat source can be used for secondary air return, which can fully dry and solidify the ink to ensure the printing surface. Entering into the corrugated paper production line and the friction between the pad and the board will not fade or "draw flowers". The automatic ink circulation system and the ink stirring rod can enable mass production of printed products with uniform ink color and no color difference. (5) High-speed automatic non-stop connection for refueling This series of models can achieve high-speed automatic non-stop connection for reloading, which greatly improves the yield and saves working time. (6) Automatic control The whole machine of this series adopts closed-loop tension control system, DT950MⅡ photoelectric registration device (or domestic registration device) of Japan Taiyo Co., Ltd., static picture observation system, computer automatic connection refueling system, and pneumatic Shaftless plate mounting, pneumatic scraper, stamping, shaftless clamping, paper preheating, water cooling and other structures make the machine operation more convenient and reliable. ◠Conclusion.
A red wine glass and a white wine glass are two different types of wine glasses used to enhance the drinking experience of each respective type of wine. Red Wine Glass,White Wine Glass,Stemless Wine Glass,Stem Wine Glass,red wine glasses set Xi'an ATO International Co., Ltd , https://www.ato2008.com
In comparison, people usually call the commonly used printing process "post-printing". Compared with post-printing, pre-printing has some obvious advantages:
Computer longitudinal cutting and computer transverse cutting are the same principle.
The printing format of this series of models can be divided into the following specifications 1300mm, 1650mm, 1800mm, 2000mm, 2200mm, 2500mm, which can be matched with corrugated cardboard line.
The use of pre-printing to produce carton is still in the ascendant in China. With the joint efforts of machinery manufacturers, ink, paper, plate suppliers and the majority of carton manufacturers, China's packaging carton grade has been raised to a new level.
A red wine glass typically has a larger bowl and a wider opening compared to a white wine glass. The larger bowl allows for better aeration of the wine, allowing it to come into contact with more oxygen and release its aromas. The wider opening also allows for better access to the wine, making it easier to take in the full range of flavors.
On the other hand, a white wine glass has a smaller bowl and a narrower opening. The smaller bowl helps to preserve the cooler temperature of white wines, as they are typically served chilled. The narrower opening helps to concentrate the delicate aromas of white wines, allowing them to be fully appreciated.
