The printing speed is the performance parameter that the user must consider and pay attention to when choosing an offset press, which is related to the production efficiency of the printing press. The cost of use, as well as the printing company's commitment to provide customers with delivery dates.
In this kind of purchasing psychology of the users, each printing press manufacturer hopes to have a printing press with higher printing speed. However, increasing the printing speed is indeed not an easy task. It is affected by many technical factors. When the printing speed is increased, the smooth requirements of the printing press must be increased accordingly. Otherwise, the machine parts will be offset due to the high speed operation. The inertia of the mass affects the vibration of the machine and affects the accuracy of overprinting of the prints. In severe cases, ink sticks will fail.
Generally, the ratio of the axial length of the cylinder of the offset printing press to the diameter of the cylinder is about 3:1. For example, the ratio of the length and diameter of the cylinder of 08 and 05 is 920:300. The balance of the press at low speeds is called static balance, but when the printing speed is increased, the static balance is far from meeting the requirements of the movement. There must also be a certain dynamic balance, otherwise the machine will be distributed in the same direction. Unevenly generated axial imbalance torque, so that it brings power, making the machine frame up and down cross-staggered vibration, affecting the production of political parties. Under the strong vibration of this force, light marks and inaccurate magnetic prints affect the quality of printed products. In severe cases, the journals and bearings are worn out, the service life of the machine is shortened, and even the machine parts are damaged and directly threaten the reliability of machine operation. Sex, stability and accuracy. In addition, it also produces impact noise. At the same time, due to the special nature of the parts of the offset press, that is, the movement of many parts on the machine is not a simple rotation, but a reciprocating swing, such as the transfer roller, the ink transfer roller, the ink roller, etc. These all bring more difficulties to the lifting of the machine.
Since the acceleration is proportional to the square of the speed and the speed is increased a bit, the acceleration will increase a lot, and the change will be larger, that is, the acceleration of the pen-swinging mechanism will be particularly great when the movement is reversed. Therefore, the realization of acceleration is generally undertaken by a sudden-type part. However, a sudden contact is a high contact, and when the acceleration is great, the contact stress of the sudden wheel is also large, so the anti-wear problem is particularly important. What kind of movements such as the follower, what kind of wheel curve is used for the sudden wheel, materials, and heat treatment processing technology will appear.
In addition, the increase in printing speed can also lead to instability in the paper movement, friction between the heat of the pair of movements, ink friction heat emulsification degeneration, high-speed moving parts with splashing lubricating oil, and lube oil heating temperature deterioration and other issues.
Then there may be a gap between high-speed printing equipment and design and manufacturing technologies that users expect. In order to meet the buyer's psychology, the seller often only writes the highest printing speed when marking the machine speed. For example, the highest printing speed indicated by the general 08 machine is At 7500 prints/hour or 10,000 prints/hour, the 05 machine generally indicates a high print speed of 7,500 prints/hour or 9,000 print/hour. In fact, there is a certain condition for running the highest printing speed, which refers to the high printing speed in the cases where the paper is neatly cut, neat and tidy, medium in weight, medium in format, the ink is excellent, the environmental sensibility is moderate, and the operator is skilled in operation. The general situation cannot be guaranteed. In this regard, the national standard has also made some brief explanations that the machine acceptance rate should be determined at 80% of the maximum speed. This may be a common-sense problem, but its different positions and different roles often make the difference between the supply and demand sides of the highest printing speed.
The user believes that the manufacturer should perform the test of printing performance according to the highest printing speed of the subject and use this as a proof of acceptance. The manufacturer only indicates the highest printing speed of the machine. There are printing conditions that describe the printing speed. When the printing conditions are not satisfied, the user will think more or less that the place of manufacture has a fraudulent component. In this regard, the author believes that the product specification can be resolved to solve the problem. The seller can print the speed at different speeds under different printing conditions, and calculate the relationship between the printing speed and the different formats, different textures, and different types of paper. Curve, practical and realistic to clear the relationship should be intuitively available to users. In this way, when the user purchases a machine, he can grasp the parameters with practical significance, which eliminates the suspicion of exaggerated propaganda from manufacturers and facilitates the consensus between the supply and demand sides when the machine is handed over for acceptance.
Understanding and Labeling the Speed ​​of Printing
March 12 05:06:35, 2024
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