In recent years, China's printing and packaging industry has introduced many foreign second-hand equipment, as many as hundreds of manufacturers use second-hand offset presses. At present, domestic personnel purchasing methods are mainly purchased from domestic operating units or imported directly from abroad. According to incomplete statistics, in addition to the middle-level sales units, there are currently more than 30 manufacturers that directly renovate and operate second-hand offset presses across the country. Most of the users who use the second mobile phone are satisfied, but there are also unsatisfactory situations. So how to avoid the mistake of buying a second mobile phone? The author summarizes the following points for colleagues' reference.
First, pay attention to the brand of the second mobile phone. To purchase second-hand printing presses, we must first have a full understanding of the printing quality, equipment performance and stability of offset presses produced by companies around the world. This is the basic premise. If the new equipment is not used for a long time and there are printing failures such as ink bars or overprinting, such machines cannot be included in the scope of purchase.
2. Find out the country or region where the second mobile phone was originally used. This is one of the factors that determine the quality and price of the second mobile phone. Machines of the same brand, model, and production at the same time will directly affect the quality of the second mobile phone due to differences in the technical quality, maintenance level, and equipment workload of the users who use the machine. different.
3. It is clear whether the second mobile phone you want to buy is printed card paper or thin paper, which is consistent with your role. Generally speaking, it was originally printed on thin paper. You can use it to print thin paper, or it can be used to print jammed paper after adjustment (vehicle speed should be reduced). If you originally printed card paper for a long time, you can only use it to print card paper, not thin paper. Otherwise it is easy to produce overprinting inaccuracy and other printing failures. Roland 700 series is another matter.
Fourth, understand the production year and the total number of prints of the equipment, and do not use "color" to discuss the price. The production year of the device and the total number of prints are one of the factors explaining the quality of the second mobile phone under normal use. The same type of equipment, the morning and evening of the production year can basically explain the advancedness and perfection of the equipment; and the total number of prints can explain the size of its remaining use value.
Fifth, understand the credibility and ability of operating second-hand equipment units. There are four types of units directly engaged in the operation of second-hand mobile phones: the whole people, joint ventures, collectives, and private companies. It can be divided into two major categories in terms of technical level: the first category is the superb technology and perfect after-sales service. The second mobile phone after its refurbishment has improved the mechanical accuracy and printing quality to a different degree than the original user transfer. In view of the problems that have arisen after many years of use, and has set internal corporate standards, he provides comprehensive after-sale technical services to ensure the future supply of spare parts; another type of technical power is lacking. The so-called refurbishment is nothing more than reinstallation after dismantling and washing. Only the appearance quality and technical services of the second mobile phone have been improved. Therefore, users can make a decision after comprehensive analysis based on their technical capabilities, the quality status and price of the second mobile phone.
6. Carefully inspect the second mobile phone to listen, see, touch and measure. Listening, that is, through human hearing, listen to whether the operation sound of the two mobile phones is harmonious in the three states of idling, instantaneous clutch pressure and combined pressure work. If there is an abnormal sound in a certain part, whether it is periodic or non-periodic impact sounds, it means that the problems of the original two mobile phones have not been solved during the renovation, and the cause must be found out to solve, otherwise it will affect the normal use in the future. See, that is, check the appearance of the equipment and mechanical parts through human vision for bad operation and oil leakage. See if the actions of each part such as water discharge roller, ink discharge roller, water and ink receiving are normal and effective Complete and so on. Touching is to detect whether there is a dent or artificial damage on the trailing part of the impression cylinder relative to the paper through human touch, to detect the vibration of the machine, and feel when the machine is turned by hand. Measurement is to measure the overall mechanical accuracy of the main roller after assembly on the machine with the help of a test tool, such as radial runout and axial runout at the left, center, and right. Measure the accuracy of repeated overprinting and visually inspect the full-plate printing for anhydrous bars and ink bars. Generally speaking, the printing industry buys two mobile phones for screen printing. Therefore, our testing requirements for the second mobile phone can be based on the national standards of China's offset printing industry.
7. Pay attention to the integrity of mobile phone information and special tools. When purchasing a second mobile phone, you must ask the supplier to provide random technical documents, such as an instruction manual (operation manual) and an atlas. The former is a reference for operators to use the machine correctly, while the latter is an indispensable basis for purchasing various accessories. While reporting the machine's factory number and year of production, the number of parts and components can be reported accurately with the help of the atlas. Without an atlas, it is difficult for you to buy the spare parts you need. Special tools are essential for operation adjustment or daily maintenance.
To buy ideal second-hand printing equipment, users can comprehensively consider the above aspects, and then make judgments based on their own experience and information to avoid mistakes.
Another situation is that the user directly introduces the second mobile phone from a foreign merchant or representative. In this case, ask whether the two phones have been renovated or need to be renovated. If it is refurbished or can only be used after refurbishment, it is safer to buy from China. If the equipment is good, it can be used without refurbishment. Because it is not convenient to directly introduce its future services, it is better to invite talents with a combination of technology and trade to participate in the negotiation together. In this regard, I propose the following suggestions for colleagues' reference:
1. To understand the current technical performance status of the second mobile phone, please provide information and data from the supplier, and select based on the principle of high quality and low price.
2. In addition to the contract, the supply and demand parties sign a supplementary agreement equivalent to the contract. The content should include: A, the manufacturer of the machine, the factory number, the year of production, the original country or region of use, and the total number of prints. B. Auxiliary equipment (static eliminator, powder spraying device, etc.) and moisturizing method carried by the second mobile phone. C. Problems with the machine. D. Acceptance and acceptance of the mobile phone's printing quality indicators and measures for failure to meet the acceptance criteria. E. The percentage of the machine model that will be paid after the standby device is accepted. F three guarantee period and which party is responsible for installation and commissioning.
According to many past examples, some units considered sloppyness when introducing second-hand equipment, which caused sequelae. When resorting to the court, in addition to the price contract, there is no other written basis, and they can only entangle between the seller and the buyer. It's still the user's interest.
Everything has a duality. Users have different uses for buying a second mobile phone. Different printing accuracy requirements for the second mobile phone cause the price difference to be quite disparate. It is our basic principle to buy the second mobile phone suitable for our products at the most economical and reasonable price.
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