Author: Li Yulong
In many production processes of packaging and printing products, hot stamping operations are often encountered, especially with the increase of anti-counterfeiting requirements, hot stamping anchor shot markers have become more common. Colorful packaging products are easy to attract people's visual attention, but also can improve the taste and grade of packaging products.
Modern mass-produced packaging needs to be completed on gravure printing machines and flexo printing machines. The materials used are reel materials, and the production speed is fast. This requires hot stamping films to be produced quickly (up to 60 meters / minute). Complete 100% transfer in time. At the same time, because the bronzing operation only occupies a small position on each small package, the anodized aluminum bronzing material must be at the same speed as the printed material during hot stamping. If technical measures are not taken, the bronzing material will be greatly wasted. Because the length of each roll of printed material is large and the size of each roll of bronzing film is very small, it cannot be matched for production. Even if the two materials have the same length, there is a contradiction that the anodized aluminum must work in steps.
The flat pressing hot stamping mechanism needs printing materials to periodically stop on the hot stamping table, and each stop position should accurately meet the position requirements of hot stamping quality, which is an issue that is not easy to solve.
In the normal direction of the printed material, if it moves at a speed of 100 meters per minute, if it is moved in the reverse direction at the same speed, it can be in a static state in space position, that is to say, a double roller swing frame can be used Periodic forward and reverse movements require the stroke length of the forward and reverse movements to be the same as the length of the printing web, and require a fixed period of time for the printed matter to stop for a period of time for hot stamping, but the mechanical reciprocating swing mechanism is generally realized by the crank connecting rod. The motion of the crank is obtained by the uniform speed rotation of the eccentric wheel. The speed curve of the crank motion is a sinusoidal curve, that is, the speed is minimum at the starting point 0 ° and the end point 180 °, and the maximum is at 90 ° and 270 °. It is a non-uniform speed movement , The motion graphics are as follows:
Then, when the printed matter is stationary on the hot stamping table, it only stops momentarily in the vicinity of the two phases of 45 ° and 135 ° during the working process, and the hot stamping operation cannot be completed. Servo motor 360 ° cycle running non-uniform speed mode software programming for 180 ° working process, and modified through trial and error so that it can completely achieve relative stillness from 45 ° to 135 ° during the working process, such as a hot stamping cycle time 400ns (150 times / min) hot stamping process 180 ° return process 180 ° hot stamping process takes 200ms, such as between phase 45 ° ~ 135 °, AC servo adopts non-uniform speed to achieve uniform linear speed to run for 100ms , More than enough to complete the hot stamping. The motion graphics are as follows:
In 2002, the author saw the in-line production of Komori Champang gravure printing equipment produced in France. Among them, there was a station for continuous stamping and continuous stamping. When the speed reached 100m / min ~ 120m / min, the stamping still worked normally, and the stamping It is clear that Komori Champion Machinery has successfully solved the speed synchronization and stepping of the bronzing film in the round and round operation, which can make the bronzing film useless and its method is simple and reliable. Uses a small inertia swing arm with a quarter of the length of the packaged printed matter unit. Because the hot stamping copper plate heated during hot stamping presses the bronzing film and the printed matter on the support roller, under the dual action of pressure and heat, it makes To achieve the transfer, the bronzing film must run at the same speed as the printed matter. When the hot stamping is completed, the raised hot spots leave. Before the next hot stamping, the anodized aluminum film is not under pressure. The film is returned to a length, so that the hot stamping film can be fully utilized during continuous hot stamping, and the hot stamping film is greatly saved. However, its structural features only solve the problem of waste of anodized aluminum, but not the positioning hot stamping of laser hot stamping materials.
Due to the development of science and technology, the domestic hot stamping film has also developed into a low-temperature cold stamping type. The hot stamping film provided by this Sangbang machine can already be supported in China. The domestic high-speed hot stamping material has allowed Xi'an Black Bull to develop the web The idea of ​​round pressing and bronzing mechanism in the operation.
Because there are two problems that cannot be solved by circular stamping before: one is how to solve the problem of waste of stamping film: one is the quality problem of stamping when working at high speed. If the above two problems can be solved, then the circular stamping mechanism itself The characteristics will be obvious, mainly due to the simple structure, small space occupation, short process adjustment time, low cost, and easy technology popularization.
Shenzhen Jinjia Printing is one of the leading domestic printing and packaging companies. In 2003, it imported a hot stamping unit that can be quickly replaced on the printing group for its Heidelberg Jielas flexo printing machine. Commissioning has successfully achieved hot stamping at a printing speed of 80M per minute. Since the company mainly produces cigarette packs, and the soft packs produced are produced with laser transfer paper, for future laser paper seam treatment, use There is a seam-based imposition method, but because of the difficulty of the AC servo motor to send hot stamping materials and positioning every few small intervals, the computer processing time is longer, so the hot stamping speed only reaches about 70 meters / minute. The printing speed adapts to the level. If the hot stamping is evenly arranged on the circumference, the gold speed can be increased to 90 meters or more than 100 meters per minute.
Because Xi'an Black Bull used AC servo motor to process the paper feeding process of the flat pressing hot stamping machine, it was recognized by Shenzhen Jinjia, and Xi'an Black Bull was commissioned to research and manufacture the round pressing hot stamping mechanism. In the new design, we removed the aluminum alloy plywood used for unwinding, making it easy to replace the new roll and remove the waste roll. The common one motor for winding is used for winding by torque slip. The unwinding takes into account hot stamping. The precise positioning of the laser anti-counterfeiting marks in the operation still uses the single-single-motor positioning drive feeding method, and the eccentric shared swing roller method is boldly used in the hot stamping intermittent feeding, which greatly simplifies the original mechanism, and the AC servo motor used is reduced to 6. Taiwan, which greatly simplifies the line and facilitates customers.
Because the design is simplified, the use is convenient, and the cost is reduced, and the roll paper round hot stamping mechanism can be used on both gravure printing and flexo printing models, which makes the domestic roll paper connection hot stamping production process have It is a practical mechanism, and because of its low cost, it can be widely used in the printing industry.
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