In the past two years, great changes have taken place in the domestic tobacco industry. The reorganization and integration of cigarette companies, especially the increase in the concentration of cigarette brands, means that the production volume of single-brand and single-brand cigarettes will be greatly improved, which requires cigarette pack printing companies to quickly provide large quantities of cigarette packaging. Therefore, cigarette packet printing enterprises must have a certain production scale and production capacity. At present, the effective combination of multiple materials and multiple printing processes has become the development trend of cigarette pack printing. Gravure printing has many advantages, such as high production efficiency, good hue consistency, good adaptability of printing materials, excellent performance in field, spot color, gold (silver) ink printing, etc., which can meet the strict requirements of cigarette pack quality. Gravure printing machines have become a popular choice for cigarette pack printing companies. In addition, the quality inspection of the printed products of cigarette packs will be further reflected in the aspects of printing odor, suitability of packaging machines, color loss, environmental protection, etc. In these aspects, gravure printing is also more advantageous than other printing processes. Therefore, the purchase of gravure printing equipment has become a topic of great concern to cigarette pack printing companies. Next, the author talks about his views on the introduction of web gravure printing machine, hoping to play a certain role in cigarette packet printing enterprises. The gravure printing machine is mainly divided into three parts: unwinding part, printing part, slitting and die cutting part. This article first makes a brief analysis of the printing part. 1. Selection of color group number. The selection of the color group number of the gravure printing machine is very important, which is mainly related to the leading products of cigarette pack printing enterprises and the environment of domestic cigarette decoration. The patterns and processes of domestic cigarette pack design are relatively complicated. In the past few years, domestic cigarette pack printing equipment mainly used 6 colors and 7 colors. In the past two years, they mainly used 8 colors. The basic configuration mode includes one full color and four colors. General colors, two spot colors and a glazing unit. The larger the number of color groups, the better. The more color groups, the more difficult it is to control paper deformation, overprinting of various colors, etc., and capital investment will increase. However, if the number of color groups is too small, it is difficult to reflect the advantages of rapid and efficient gravure printing and one-shot molding, so users must choose according to their own needs and future development plans. Although the manufacturers of gravure presses all promise to increase the number of units in the future, not only will the investment be large when adding additional units, but due to the technical upgrade of the gravure press and the installation position and space of the gravure press, they will be affected limit. 2. Selection of printing format. The requirements of various manufacturers on the printing format are very different. The wider the format, the higher the paper requirements and the greater the impact on overprinting. Cigarette printing equipment is more suitable for 650mm and 820mm. In the past, printing companies basically chose the former, which was relatively economical and affordable in typesetting, plate-making, plate installation, die-cutting cylinders, and paper specifications. In typesetting, you can arrange 6 rows and 4 rows of soft packs, 6 rows and 2 rows of hard packs, 1 row and 2 rows of strip boxes, 6 rows of 2 rows or 8 rows and 2 rows of die-cutting rollers, and the maximum paper size is 650mm. Smaller, less paper deformation during printing, which is very beneficial for product overprinting. However, there is a key problem, that is, when printing a box product, the paper fiber direction is perpendicular to the printing direction. For the current high-speed cigarette packaging machine, the packaging adaptability is poor, and the appearance molding degree is poor, causing quality problems. many. For this reason, many printing factories have to adopt the method of printing only one at a time, which seriously affects the efficiency of the gravure printing machine. In the past two years, the industry has basically reached a consensus. If printing a box, it is best to choose a 820mm format gravure printing machine, so that when typesetting, the box can be arranged in 1 row and 2 rows, hard pack small box 6 rows and 3 columns, soft pack small Boxes 6 rows and 5 columns. For products with high precision requirements and multiple printing processes. It is recommended to keep as few rows as possible, generally 12 ~ 16 is the ideal typesetting quantity, which can reduce the waste caused by paper deformation and multi-pass processing. If online die-cutting is adopted, the layout can be free from this limitation. 3. Installation method of plate cylinder. The installation method of the printing plate cylinder has a great influence on the accuracy of overprinting, printing flatness and the jumping of the printing plate cylinder, and plays a key role in whether the printing equipment can run at high speed. In the past, it was mostly mechanical installation, but there were two problems: inconsistent installation tightness and easy loosening. Under the condition of high-speed operation, it is easy to cause the overprinting accuracy to decrease. At present, the installation method of the plate cylinder is basically changed to pneumatic locking, the locking force is consistent, and it is not easy to loosen, which is suitable for high-speed printing. 4. Overprint control. Overprint accuracy is the core index of gravure printing machines and plays a key role in product quality and loss control. In the past, the gravure printing machine could only perform longitudinal automatic register control. The register mark is generally 4mm * 4mm or 4mm * 6mm square or rectangular. The adjustment of the horizontal register is mainly done manually. At present, both horizontal and vertical registrations are automatically adjusted, which requires that there must be horizontal registration marks. There are two main types of control. One is to add a registration mark to control horizontal registration, so that each color The group must be controlled with two scanning positions. Another is to change the overprint mark to a triangle, use the hypotenuse of the triangle as the control point, and the length of the triangle's right-angle side is 4-8mm, which is currently used in more control modes. In the adjustment of overprint deviation, in the past, the alignment of the various color overprints was mainly achieved by adjusting the position of the plate cylinder relative to the paper. Currently, the position of the paper relative to the plate cylinder is mainly adjusted. This method does not need to change the operation of the plate cylinder The speed is conducive to the adjustment of overprint under the condition of high-speed operation, and the adjustment accuracy is easy to control, and the overprint precision is high. In order to ensure the high quality requirements of the printed matter, the overprinting accuracy of the gravure printing machine should be controlled within ± 0.10mm. 5. Drying method. In the past, gravure presses mainly used hot air drying, mainly for solvent-based inks, but now there are many types of inks and varnishes used in gravure printing, such as alcohol-soluble inks, water-based inks and varnishes, UV inks and varnishes. Can't solve the problem. At present, the infrared heating air drying method is mainly used, especially after a large amount of water-based ink is used, a large air volume hot air drying device becomes the basic configuration. Hot air dryers use electric heating or steam heating. The electric heating method has a large demand for electricity capacity, about 150kVA. If the power needs to be expanded and there is an existing steam pipeline, you can directly use steam heating the way. At the same time, the number of devices using UV curing methods is also increasing, but there are still some problems in ink and technology. I believe that in the near future, UV curing methods will also become standard configuration. 6. Ink circulation system. Gravure inks, especially formulated spot color inks, are prone to precipitation if the compatibility of two or more binder resins is poor. In addition, gold and silver inks with large particles are also prone to precipitation. Therefore, the circulation of ink is crucial. The ink circulation system must have the following functions: stir the ink to avoid precipitation or ratio change; normal delivery of ink, it is not easy to produce bubbles, precipitation and splash during the delivery process; filter ink, the mesh of the filter should be around 120 mesh; Solvent replenishment function to ensure proper ink viscosity. 7. Electrostatic ink removal device. The disadvantage of the gravure printing process is that the screen printing is greatly restricted, especially when printing full-page transition nets or local level effects, it is very difficult to achieve 175 lines / inch accuracy, and small dots are easy to lose, and the printing effect is very rough. The electrostatic ink removal device can significantly improve this situation. It forms a high-voltage electrostatic area between the conductive surface of the electrostatic pressure roller and the paper, the paper and the plate cylinder. Under the action of static electricity, the ink is removed from the mesh of the plate cylinder It is sucked out and transferred to the surface of the paper evenly, and the ink transfer rate reaches or approaches 100%. It is not necessary to configure an electrostatic ink transfer device for each color group. Generally, a production line with 4 color groups is sufficient. The installation position should be reserved on each color group. When the position of the printing color group changes, the electrostatic ink transfer device can switch between the color groups. Now, the function of the domestic electrostatic ink transfer device is very ideal, and it can also be exchanged with foreign devices, the price is only about 1/5 of the imported device. 8. Shaftless transmission mode. The gravure printing machine generally adopts universal shaft transmission, but the linear speed of the printing plate cylinder changes greatly during transmission, and even affects the accuracy of overprinting. In the past two years, shaftless transmission technology has developed rapidly. High-end gravure printing machines basically use shaftless transmission, which greatly improves the accuracy of multi-color gravure printing machine transmission and overprinting, and can fundamentally realize the transmission control of a single unit. , Is the main method of multi-color unit transmission in the future. Now the more shaftless transmission mode is adopted, that is, each unit is directly driven by a DC motor, and then centralized control is achieved on the basis of subunit control, for example, the speed of a single unit can be changed, and the unused monochrome is controlled The unit stops running to reduce wear and energy consumption, and it is also essential to improve the accuracy of overprinting under high-speed operation. 9. Tension control mode. In the past, the entire gravure press production line used only one tension control system, which was placed behind the last printing unit, and the tension of the entire production line was adjusted by controlling the relative speed difference between the feed speed and the exit speed. The range of tension change is large, generally above 50 Newtons, plus it realizes overprinting by adjusting the position of the plate cylinder, the tension change between the color groups is greater, so the stability of overprinting between the colors is also very poor. Basically, the tension control of the color separation group is now changed, and the tension control of the entire production line is distributed to each color group, which greatly reduces the range of tension change. Generally, the tension change of each color group is about 5 Newtons. Accurate overprinting laid a good foundation. In the whole production line, the tension value of each color group should be as consistent as possible. Generally, depending on the paper, a fixed value between 200 and 300 Newtons should be selected to make the paper tension uniform during the printing process and reduce it to a certain extent The paper is deformed. 10. Online quality monitoring. Online quality monitoring can be divided into three levels: online partial overprint monitoring, online product pattern monitoring and alarm, online product pattern and ink color monitoring. The on-line partial overprint monitoring is to pass the local overprinting crosshairs or key fine patterns on the printing web through a digital camera, and then carry out the enlargement process, generally enlarge 15-20 times, and carry out synchronous tracking. The operator can monitor the overprinting effect of the entire printing format, and adjust in time if problems are found. Online partial overprint monitoring is the most basic and necessary online quality monitoring mode. Generally, one or two parts are installed, and the price of a system is about 50,000 to 80,000 yuan. The online product pattern monitoring and alarming is to input the sample pattern into the computer, and also to scan the online printed matter, and compare the change of the printed pattern position with the sample pattern position. Mark or reject the product. This method is now widely used, and the price of a system is about 800,000 yuan. The online product pattern and ink color monitoring is based on the second online quality monitoring method, which adds automatic adjustment of the equipment and control of the ink color. This method is rarely used and is mainly used in the printing industry because of monitoring The cost of equipment is relatively high.
Over Bed Tables are highly convenient for those who need to spend most of their time lying in bed. Bedside tables are commonly used in hospital rooms to make a situation more convenient by wheeling the table over the mattress for eating, reading or simply to rest anything on a flat surface.
The U and H shaped base allows the table to be remain in place over the bed, even when the user is moving or sleeping. Swivel casters allow the over bed table to be easily transported from room to room. Over Bed Table,Bedside Dining Table,Bedside Medical Table,Air Drive Over Bed Table Jiangmen Jia Mei Medical Products Co.,Ltd. , https://www.jmjiameimedical.com
The printing part is the core part of the gravure printing machine, which completes printing, overprinting and drying of various colors.
We supply a range of over bed tables including fixed flat tables, along with split top versions that make reading, drawing and using electronics easier and more comfortable. The height adjustable frame enables the table to be used over a wide variety of beds and chairs. A wipe clean surface and sturdy construction make this ideal for home and facility use.