In the design and printing of picture albums, conflicts often arise due to the difference between proofing and printing. How to solve this problem, let's talk about:

1. Management and unified coordination of lithographic printing are mainly two major processes of plate making and printing. These two are an organic whole, and the quality of any link in the process of plate making and copying directly affects the printing quality. The quality of printing is to take the new situation on the quality of printing itself, and the second is to take the new situation on the quality of plate making. Therefore, plate making and printing are inseparable and complete unity. At present, we all divide plate-making and printing into two different units, so in production operations, the business department in charge of production should coordinate the relationship between the two, which is increasingly important. Doing this well will not only help to implement the production plan, but also help to improve product quality. In our printing production unit, plate-making and printing are too clearly separated, and the boundaries are too clear, which causes the plate-making people not to understand printing, and those who do not understand plate-making. The printing factory is to take printing as the center, and the plate-making must serve the printing, because the printed product is the final product. For example, when the printing machine is adjusted to the best state, what should be the solid density? What is the difference between the dot expansion value of the printing machine and the proof? What is the difference between the gray balance curve of the printing and the proof? What is the color sequence of the proof and the color? Changes? What are the overprint rates of the wet press for proofing and the wet press for printing? These problems are not just a printing issue, but more importantly a platemaking issue. Platemakers should have an understanding of the various conditions of printing in order to produce a printing plate suitable for printing according to printability.

2. Proofing and printing color sequence should be consistent. The printing color sequence of map printing is generally black brown, blue green. In this way, the dark color is in front, the light color is in front, the main elements are in front, and the secondary elements are in front; the small dot area is in front, and the large dot area is in back; the ink brightness is dark in front, and the light is in back. The color sequence of the proofing should also be unified with the above color sequence. Especially when printing other color paintings and field photos, it is necessary to emphasize the consistency of proofing and printing color sequence. If the color sequence of proofing and printing is not unified, there will be a problem that the printing cannot catch up with the proofing proofs. When printing color pictures and field photos, the printing color sequence is unified as: black-cyan-magenta-yellow. This helps to highlight the outline of the black version, stabilize the undertone color, and help highlight the main color.

Third, the reason for the gap between printing and plate making proofing is caused by the sampling, and some methods to reduce the difference between printing and proofing are proposed:

1. Proofing usually uses thicker, whiter copperplate, with less distortion, high fitting accuracy, and beautiful appearance. Printing is mass production, and the use of paper must consider various factors such as cost, paper deformation rate, and whiteness. This makes it impossible to use thicker and whiter coated paper. In order to reduce the difference between printing and proofing, printing must be considered when proofing, and the paper used is consistent with printing.

2. The color sequence problem. In the proofing, it is usually considered that the ink washing is convenient. Generally, the light color is proofed first, and then the dark color is proofed. While printing is just the opposite, the main color (black) is printed first, and the secondary color (green) is printed later. In order to narrow the difference between fearlessness and proofing, it is necessary to consider printing when proofing, first proofing dark, then light proofing.

3. Overprinting method: wet proofing and drying during proofing, that is, after the proofing ink is left for a period of time, the ink layer is properly dried, and then the next color is proofed. While printing is wet press wet, the printing time before and after is very short, the ink layer is too late to dry. For this problem, only a few colors can be sampled in time at the time of proofing.

4. Embossing method: circular flattening when proofing, and circular flattening when printing, under the same width of the bar, the compression amount of the circular flattening printing machine is double that of the circular flattening proofing machine. Therefore, when adjusting the printing pressure, the pressure bars of the two machines cannot be adjusted to the same, that is, the thickness of the lining should be adjusted.

5. The printing and proofing speeds are different, so the adhesion of paper to ink and the peeling force of ink on paper and cylinder are not equal. The speed of the proofing machine is low, the peeling force of the roller, ink, and blanket on the paper is small, the printed sample ink layer is thick, the dots are smooth, the expansion value is small, the level is rich, and the contrast is large. The speed of the printing machine is fast, generally at 8000 prints / hour, and the contact time of the corresponding dots between the printing surfaces is reduced. As the peeling force of the ink on the paper increases, the transfer of ink volume is reduced, making the ground unrealistic and the dots not strong, reflecting the thin ink layer on the printed matter and low contrast. To reduce the difference in this respect, from the printing point of view, it is necessary to properly control the machine speed; use a hard liner; reduce the amount of fountain solution for weight loss during the day. This reduces the peeling force, thickens the printed ink layer, and reduces the dot expansion value, thereby increasing the contrast.

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