Analysis on how to save paper in eight-color rotary offset printing equipment
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Rotary offset printing, especially commercial web offset printing, is expensive, and commercial paper with higher added value uses low-quantity reel coated paper. Due to the particularity of the web, it is difficult to use the flat paper management method for quantitative management of the web. However, if the management of the web can not be kept up, even if the business volume is sufficient, the profitability of the web offset printing equipment is difficult to improve, so it is inevitable to explore the savings of the web offset printing paper.
Eight-color web offset printing is one of the main hot spots in the field of printing equipment in recent years. This boom is due to the increasing competition in China's printing market and the maturity and refinement of the print consumer market. Rotary offset printing, especially commercial web offset printing, is expensive, and commercial paper with higher added value uses low-quantity reel coated paper. Due to the particularity of the web, it is difficult to use the flat paper management method for quantitative management of the web. However, if the management of the web can not be kept up, even if the business volume is sufficient, the profitability of the web offset printing equipment is difficult to improve, so it is inevitable to explore the savings of the web offset printing paper.
Master the characteristics of web offset printing
There are three characteristics of rotary offset printing: high printing speed, additional functions and high operating costs. Its printing speed is high in the average book speed of offset printing up to 20,000 pairs of double-sided four-color / two-color / monochrome posts, commercial, semi-commercial eight-color rotary offset printing speed of up to 35,000 ~ 50,000 or more open color order . Therefore, if the operator's technology is not very mature, or the response to equipment failure, processing is not timely, or can not be found in the commissioning stage, which may lead to a large number of printed products, the paper waste caused by commercial web offset printing will be very alarming.
Commercial and semi-commercial web offset presses have many additional functions, including drying, cooling, glazing, etc., to meet the requirements of commercial printing speed, large batch, multi-batch, multi-layer, personalization, high-grade, colorization, etc. Words are often very much needed, but correspondingly, the paper path is lengthened, so that the paper consumption for paper-feeding and debugging is further increased.
High operating costs. Commercial rotary offset printing has higher performance requirements for mechanical parts, raw and auxiliary materials, and even lubricating oil. In addition, if additional functions are enabled, the running cost is very high. Therefore, the management requirements for all aspects are relatively high. Otherwise, even if the processed prints are high value-added products, these attractive profits will be swallowed up by the consumption of commercial rotary offset "aristocratic" operations.
Improve paper management
After understanding the above-mentioned characteristics of the rotary offset printing production, it is necessary to carry out scientific control in management to achieve the purpose of saving paper.
In management, we must make two good passes. One is to close the warehouse, and the other is to go to the paper. Regardless of whether it is put into the warehouse or printed on the machine, it should be counted by volume of the printed paper according to the type and batch of printed products to ensure that it is not missed, not remembered, recorded accurately, not faked, and the paper library management personnel and workshop The machine should be reconciled regularly and supervised.
The weight of each roll of the manufacturer's web is marked with the weight, but the weight of each roll is not exactly the same. It must be counted by volume before entering the warehouse and before going to the machine to ensure the accuracy of the amount of paper and paper. Even if the web is stacked directly on the shop floor, the paper library manager should register when the paper comes into play, and check with the shop paper management personnel to sign each other's account. After the recipient has received the registration in accordance with the regulations, the unique identification volume number prepared by the paper library management personnel according to the labeling standard shall be marked on the outer packaging of the paper roll so that the next process can be filled in when the other items are filled out.
The machine is continuously produced. After each print is finished, it rarely happens to use up the paper on the machine. After the paper is unloaded and then loaded, it is both troublesome and impossible. A table of the monitoring and continuous improvement of paper usage during the production process is used as a paper input-output balance sheet. According to the situation, a summary analysis of the paper input-output balance sheet by month (season/year) is conducted to find the propensity problem, find the cause, and take corresponding corrective and preventive measures.
In view of the fact that the commercial and semi-commercial 8-color web offset printing papers are generally long, a special paper roll holder for paper-making can be used, and the paper is fed by the core tail paper. The specific method: placing the paper frame between the secondary tension and the second printing unit, passing through each printing unit and the post-printing function, until the folding plate is worn out at the triangular plate, and then passing through the secondary tension roller. The paper roll on the upper paper part is connected. This method can be used for paper-feeding operations such as paper feeding, paper-cutting, and paper-feeding. It is measured on the semi-commercial 8-color web offset printing of Harris-Heidelberg V30, and can be used for 30 meters.