Important precautions for buying second-hand printing presses!

How to avoid the mistake of buying a second mobile phone? Summarize the following points for your colleagues' reference.

1. Pay attention to the brand of the second mobile phone. To buy a second-hand printing press, you must first have a full understanding of the printing quality, equipment performance and stability of the offset printing presses produced by various companies in the world. This is the basic prerequisite. If the new equipment has not been used for a long time and there are such or other printing failures as ink bars or inaccurate overprinting, this type of machine 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. For machines of the same brand, model, and time produced, due to the differences in the technical quality, maintenance level and equipment workload of the users who use the machine, the quality of the second mobile phone will be directly affected, so the price will also vary. different.

3. Know whether the second mobile phone you want to buy is printed on cardboard or thin paper, and whether it has the same function as yours. Generally speaking, it was originally used to print thin paper. You can use it to print thin paper, or after adjustment, it can be used to print cardboard (the speed of the car should be reduced). If you used to print cardboard for a long time, you can only use it to print cardboard, not thin paper. Otherwise, inaccurate overprinting and other printing failures are prone to occur. The Roland 700 series is another matter.

4. Understand the production year and total number of prints of the equipment, and do not consider the price based on "fineness". The production year of the equipment and the total number of prints are one of the factors that explain the quality of the second mobile phone under normal use. For equipment of the same model, the date of production can basically indicate the advanced nature and completeness of the equipment; and the total number of prints can indicate the size of its remaining use value.

5. Understand the credibility and ability of the unit operating second-hand equipment. There are four types of units directly engaged in the operation of second-hand mobile phones: all-people, joint venture, collective, and private. In terms of technical level, it can be divided into two categories: the first category has superb technology and perfect after-sales service. After its refurbishment, the second mobile phone has improved mechanical accuracy and printing quality to different degrees than the original user when it was sold. In order to solve the problems that have occurred after many years of use, and set internal corporate standards, he provides complete after-sales technical services to ensure the supply of spare parts in the future; another type of technical force is lacking. The so-called renovation is nothing more than re-installation after disassembly and washing. Only the appearance quality of the second mobile phone is improved, and the technical service is not perfect. Therefore, users can make a decision based on their own technical capabilities, the quality status and price of the second mobile phone after a comprehensive analysis.

6. Carefully inspect the second mobile phone to listen, see, touch, and test. Listening is to listen to whether the operating sound of the two mobile phones is harmonious under the three states of idling operation, clutch pressure moment and combined pressure operation through human hearing.

If there is an abnormal sound in a certain part, whether it is periodic or non-periodic impact sound, it indicates that the problem of the original second mobile phone has not been resolved during the renovation, and the cause must be found and resolved, otherwise it will affect normal use in the future.

To see, that is, to check the appearance and parts of the equipment through human vision for bad operation and oil leakage. Check whether the actions of various components such as water outlet roller, ink outlet roller, water and ink receiving are normal and effective, check whether the machine itself should have functions such as powder spraying and axial fan functioning normally, and check whether the machine should have accessories Complete and so on.

Touching is to detect whether there are dents or man-made damage on the trailing part of the impression cylinder relative to the paper through the human hand, feel the vibration of the machine, and feel when the machine is rotated by hand.

Measurement is to measure the mechanical comprehensive accuracy of the main drum 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 check whether there are water bars and ink bars in full-page printing. Generally speaking, the second mobile phone purchased is used for screen printing. Therefore, our testing requirements for second mobile phones can be based on the national standards of my country's offset printing industry.

7. Pay attention to the completeness of the data and special tools of the second mobile phone.

The purchase of a second mobile phone must require the supplier to provide random technical documents, such as instruction manuals (operation manuals) and atlases. The former is a reference for operators to use the machine correctly, and the latter is an indispensable basis for purchasing various accessories. At the same time that the factory number and production year of the machine are reported, the number of the zero and part (assembly) parts can be accurately reported with the help of the atlas. Without an atlas, it will be difficult for you to buy the spare parts you need. Special tools are indispensable for operation adjustment or daily maintenance.

To buy the ideal second-hand printing equipment, users can comprehensively consider the above aspects, and then combine their own experience and information to make judgments, which can completely avoid mistakes.

Another situation is that the user directly introduces a second mobile phone from a foreign business or representative business. In this case, ask whether the second mobile phone has been refurbished or whether it needs to be refurbished. 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. Since it is not very convenient to directly introduce its services in the future, it is better to invite talents who combine technology and trade to participate in the negotiation. In this regard, I propose the following suggestions for my colleagues' reference:

1. To understand the status quo of the technical performance of the second mobile phone, please provide information and data from the supplier, and select them 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. The auxiliary equipment (static eliminator, powder spraying device, etc.) and wetting method that the second mobile phone carries. C. Problems with the machine. D. Acceptance of the printing quality index of the second mobile phone and the handling method for failure to reach the acceptance index. E. The percentage of the machine payment that is paid after the standby device is qualified. F Three Guarantees period and which party is installed and debugged.