Whether the registration of the color newspaper meets the specified accuracy requirements There are many factors that affect the accuracy of registration of color newspapers: ①whether the film itself can be registered; ② whether the registration accuracy can be guaranteed during imposition; ③ whether the punching, printing, bending, and mounting are accurate; ④ the printing machine itself Whether the main paper take-up roller is horizontal and whether the surface of the paper take-up roller in the middle of the printing unit is cleaned in time; ⑤ Whether the pressure of the blankets on both sides of the double-width printing machine is balanced; Accuracy also has an effect; ⑦Whether the paper itself is rewound during the printing process; ⑧The fan-shaped expansion of the paper during the printing process affects the registration accuracy of the color newspaper and so on. Taking into account the above influencing factors, we require the registration accuracy error of the finished film to be less than 0.02mm, and the registration accuracy of the final printed newspaper is guaranteed to be around 1 line, at most no more than 2 lines, for newspapers over 2 lines Will be treated as scrap. Whether the water-ink balance of the color newspaper in the printing process reaches the best state Maintaining the best water-ink balance in the printing process of color newspapers is essential for printing color newspapers. When the water-ink balance is controlled well, the printed color newspapers can be bright and have good gloss, which is easy to use The most beautiful color newspapers are printed with water and ink; on the contrary, if this problem is ignored, the unlimited increase of ink in the printing process will bring such large-scale emulsification of ink, wet newspaper sticky hands, and gray headings, photos Darkening and other hazards. There are basically two consequences of the destruction of the ink-and-ink balance: one is that the layout is dirty; the other is that the amount of water is too large. Everyone knows the hazards of dirty newspapers. Here we mainly talk about the hazards of excessive water. The surface phenomenon where the amount of water is too large is that the printed newspaper is gray, and the graphics are matte. In fact, the harm of excessive water and ink is also reflected in the following aspects: ①Water will enter the ink fountain along the ink transfer roller and the ink transfer roller, causing a wide range of ink emulsification; The influence of equipment maintenance and maintenance on the quality of color newspaper printing To achieve the best water-ink balance in printing, in addition to requiring the printing operator to have a strong sense of responsibility when setting up the machine, it is also inseparable from the usual maintenance and repair of printing equipment. In production practice, equipment maintenance and maintenance have a great influence on the ink-water balance value in printing and even the printing quality of the entire color newspaper. Therefore, in the usual production management, the parameters of water and ink balance in the printing process can usually be used to detect the maintenance and maintenance of the machine by the operator. The maintenance of the equipment requires the operator to proceed from the following 6 aspects. 1. After printing the newspaper of the day, clean all the water glue, ink glue and paper guide roller of the machine. 2. Regularly check the pressure of the water glue and ink glue, especially when changing the season, you must check the pressure of all the rubber rollers comprehensively. If you find that it does not match the specified pressure value, you should adjust it to the specified value in time. 3. Issues related to printing equipment reflected in the usual newspapers should be promptly investigated and resolved in a timely manner. 4. Periodically measure the concentration of dampening water in the water tank. It is required that the conductivity value and pH value of dampening water meet the standard at the same time (the conductivity value is generally 1000 ～ 1400μs, the pH value is generally 4.8 ～ 5.3). 5. Regularly clean the water tank, water bucket, inlet pipe and return pipe, and remove the dirty blocks among them to prevent the dirty blocks from blocking the bucket and affecting the normal water supply. 6. Check the flatness and resilience of the blanket surface, and make regular inspections and timely replacement (the double-width machine should also consider eliminating the gap between the two blankets in time). In addition, the impact of the use of printed materials and the ideal printing equipment on the print quality of color newspapers is also very obvious, so I wo n’t go into further details here. Pu Molded Pillow,Molded Foam Pillows,Pu Molded Pillow Body,Custom Molded Pillow Hebei siuno household supplies co.,ltd , https://www.ciaosleep.com
â‘¡The printed sheets will get wet and affect the quality of the newspaper;
â‘¢ The printed newspaper headline will be grayed out and the photo will be darkened;
â‘£The viscosity of the ink drops sharply, causing scumming or turning the ink stick into the water hopper, and then flowing back into the water tank. After a long time, flocculated ink particles appear in the water tank;
⑤ A large amount of acidic water vapor will be generated, causing corrosion to the machine.