Fault features detailed in offset printing
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The so-called offset failure refers to the phenomenon of abnormality during production or during machine operation. As an offset press operator and management personnel, it is necessary to master the law of the occurrence of offset failure and the method of troubleshooting, so that the production can proceed smoothly.
The biggest features of offset printing are:
1. Comprehensive and complex
The offset printing machine is a complicated machine. Its power system consists of a motor and a gas pump. Its movement is synthesized by means of paper feeding, positioning, inking, water delivery, embossing, and paper delivery. During this period, there are many cooperations. With the transfer, in addition to the use of printed materials, and finally printed on the surface of the substrate. In this process, the fault can be generated in any part and any process at any time, or between its mating relationships, which determines the comprehensiveness and complexity of the offset fault.
Its comprehensiveness and complexity are also manifested in the fact that the same fault can be caused by different reasons. For example, the misregistration may be caused by improper adjustment of the positioning mechanism, or may be caused by improper lining or improper control of the use of the dampening fluid. Conversely, the same cause may cause different faults. For example, excessive use of the dampening fluid may result in inaccurate overprinting, dirty back, and poor drying. Due to the comprehensiveness and complexity of printing failures, it was decided that offset printing operators should develop from one-way thinking to multi-directional thinking.
2. Practicality of offset printing
Offset printing faults are manifested in the process of printing production. The understanding of offset printing is based on theoretical understanding. It is impossible to obtain deep understanding and intuitive judgment of offset printing faults, and it is impossible to obtain the ability to eliminate faults. You must be familiar with the actual performance of various faults in practice, analyze the causes on this basis, and accumulate the ability to eliminate faults. To eliminate faults, you need to make some adjustments to the offset press or printed materials. This adjustment depends on theoretical guidance and practical experience, but the process of adjustment is the performance of operational skills, whether the adjustment is reasonable, whether it is in place, must be specific analysis of specific faults. The same type of substrate has different faults in different models. Therefore, the analysis of printing faults is not only a technical theory, but also a practical skill.
3. The regularity of offset printing
Offset printing faults have both comprehensiveness and complexity, but they also have their regularity. As long as they master the rules of faults and clarify their ideas, then complex faults can be eliminated in time. The law followed by offset printing is essentially the principle of offset printing process and the law of operation control technology. If it conforms to this law, printing will proceed normally. Otherwise, various faults will occur, and the elimination of such faults is also Regular. Generally, a fault occurs. The classification is first, whether it is a device fault or a process fault. If it is a mechanical fault, it must follow the mechanical fault to analyze and eliminate. Otherwise, it is analyzed and excluded according to the law of the process fault. Different machines There are also different rules. For example, the fault rules generated by sheetfed offset presses and web offset presses are different. Similarly, the problems caused by monochrome offset presses and multicolor offset presses are different. Offset machines and semi-satellite roller-aligned offset presses produce different faults, so on the basis of mastering the commonality of printing faults, it is necessary to understand their individuality so that they can be targeted.