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This example shows that the machine is a Heidelberg M-600 commercial rotary machine. Because of its fast speed (40,000 sheets / h), automatic tracking register, automatic cleaning blanket, zero-speed paper and multiple folding methods, it has been well received by printing peers. Because the rotary machine must use the roll of white paper to match the plate, it is different from the platform machine that can repeatedly use the roll paper for plate matching, so it causes a certain waste of paper and increases production costs. Therefore, in order to solve this problem, we conducted in-depth research and strict control of each link in the entire printing process, and achieved remarkable results. The steps and methods are as follows.
1. Preparation stage
Carry out the following checks before starting the machine to avoid unnecessary human shutdown due to these reasons after the machine is turned on, because every restart will cause at least 170 blank sheets of waste.
Perform paper detection first. There should be a special person to carefully check the weight of the roll paper and the outer packaging. If the paper roll is seriously damaged, it will pick up a lot of paper, which will cause paper waste. Therefore, in order to ensure that each roll of paper can be effectively used, the first pass of good production must be put in order to truly reduce costs.
Secondly, before loading the paper, be sure to clean the ground for sanitation, remove fine sand particles, and transport the paper roll under the paper holder to open the outer package (reduce the contact between the paper roll and the ground). Because a very small grain of sand can cause many small holes in several layers of paper, and the advanced light-eye detection device of the M-600 rotary machine regards the small paper hole as a paper break signal, which will automatically cut the paper. The belt and the machine stop urgently. This will not only cause serious damage to the machine, but also waste a lot of paper when restarted. In addition, when removing the outer packaging of the paper roll, pay attention to the outer packaging paper, so as not to damage the plastic packaging skin.
Third, the precautions before publishing are to check the thin lines around the layout and diamond blocks (for tracking and registering). The thin lines must be wiped clean, then scan the version, preset the front and back parameters, etc. program. Fourth, depending on the binding, riding or page drawing situation, the flower knife or broken knife on the triangle board should be adjusted; at the same time, the folding machine and stacking machine should be adjusted according to the format.
2. During operation
During the operation of the machine, minimize artificial downtime to ensure the normal operation of the machine.
1. After the machine is started, the work of each process must be coordinated and consistent. For example, the front and back registration and ink color adjustment are synchronized. The folding process is adjusted before the end of the registration. Do n’t waste paper because of the extension of the time of receiving the individual products.
2. In some cases, the paper roll will violently vibrate due to eccentricity at the end. In order to ensure the full utilization of the paper, the joints can be properly slowed down according to the actual situation.
3. Some folding pages can be used as a test machine before binding after manual folding.
3. Technology
1. Careful calculation will also save paper consumption. For example: in the actual production process, there are such cases: there are four sets of book sets, each 100,000 copies, each 3.25 printed sheets. If four 0.25 printed sheets are combined into one printed sheet, three sets of film editions can be saved. Set PS version, and save three sets of paper, to achieve paper-saving, version-saving, and time-saving ergonomics; even if the number of printing is different, such as 80,000 copies of 0.75 printed sheets and 60,000 copies of 0.25 printed sheets can also be combined into one printed sheet, To achieve the purpose of saving paper. If printing separately, 3 sets of printing plates and 3 sets of printing paper will be needed, which will increase the amount of paper and production costs.
2. In comparison, lightly coated or coated paper has less influence on the blanket of the rotary machine. If you want to use both light-coated and coated paper products and offset-printed products in a journal article, you must first print light-coated and coated products, and then print double-coated paper products. Because the double offset paper itself has a certain amount of paper powder, if you print the offset paper first, the blanket of the rotary machine will produce a lot of dirty spots. If there are any products that print light coated paper, it will take a lot of time to remove it and also waste A lot of paper. Therefore, reasonable arrangements must be made in terms of paper and printing process. In order to achieve a multiplier effect.
3. Due to the difference in the tension, width and gram weight of light-coated paper, coated paper and offset sheet, the tension and tension of the paper holder have different parameters during the paper roll switching process. A paper break occurred during the paper receiving process. Through the strict control of the above-mentioned links, each register paper is greatly reduced, which saves costs, improves work efficiency, and also extends the service life of the machine.
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