Different from ordinary color printing , Atlas ( publishing ) publishing and printing has the characteristics of more graphic color overprinting level, uniform density in the field, small overprinting error, and high precision of folding binding. In this article, the author will share with you the print quality problems that are easily seen in the printing process.
Graphic color is not correct
the reason
Due to the multi-layered color of the Atlas (book), the text annotations and line markings of the printed layout are mostly overprinted with 2 to 4 colors. If the color sequence is unreasonable or the density of the ground cannot be controlled within the quality index, it will appear. Ink, ink or color cast.
Solution
Reasonable determination of printing color sequence and solid density. On the basis of fully analyzing the color originals of the atlas (book), the printing color order of black, magenta, cyan, and yellow is determined according to the principle of printing color order. When determining the solid density of each color, the brightness of the color and the ink absorption of the printing paper must be considered. Usually through the printing proofing experiment, the black plate should be determined to have a solid density of 1.75 to 1.85, a magenta plate with a solid density of 1.45 to 1.55, a green plate with a solid density of 1.50 to 1.60, and a yellow plate with a solid density of 1.00 to 1.10, and the same color version. The smaller the difference in field density, the better.
After binding to a book, the colors of the drawings are inconsistent
the reason
After the atlas (book) is bound, the whole picture is mostly expanded. When the pre-press imposition is cut, the same picture is often divided into two parts, and is in different printing layouts. After binding into a book, it becomes a complete picture. When printing, because the difference in the density of the two parts is large, the color of the surface will be obviously inconsistent after being bound into a book.
Solution
Before printing, the printing paper should be printed as much as possible, and then the printing should be done after the color is evenly stabilized. During the printing process, the operator should use a color reflection densitometer to measure the solid density of the printed matter to ensure the same color before and after. Samples with spreads should be properly saved so that they can be analyzed and compared in the next step of printing, and the amount of ink supplied can be adjusted at any time.
Imprinting accuracy is not accurate, the graphic line appears "double line"
the reason
The atlas (book) notes and line drawings are made up of different colors, and the overprinting accuracy is slightly deviated. The line marks cannot be accurately stamped together, and the “double line†phenomenon appears.
Solution
In the atlas (book) printing proofing process, it was found that the ordinary set angle can not accurately control the high-precision overprinting, while the "Tian" type corner line can be used for the normal line width of 0.10mm, which better controls the overprinting precision. Meet the characteristics of the Atlas (book) overprint precision requirements. When the "Tian" type angle line width is set to 0.08mm, the operator can observe the overprinting of yellow, magenta, cyan and black plates more accurately and clearly, so as to achieve more precise control of overprinting.
The map is misplaced and the graphics are inconsistent.
the reason
When the printing is reversed, the rules of the front and back are unstable, the folding and the accuracy of the binding are insufficient, which may result in obvious misalignment of the drawing surface and inconsistent graphic lines.
Solution
Atlas (book) is double-sided printing. When folding and binding, there are many graphic lines and stitches. Therefore, it is necessary to strictly control the stability of the printing machine rules. The front and back printing adopts the double gauge, and the back printing uses the reverse pull gauge. To ensure the stability of the position of the graphic. Before printing, the operator should make a rule line for each layout. In the printing process, it should be timely checked whether the rule line is printed well. In addition, the folding and binding precision should be controlled, and the matching and high-precision folding and binding equipment should be selected.
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