Four points should be paid attention to in order t

To realize the seamless connection between pre press, printing and post press, we must pay attention to four elements

release date: Source: packaging business district Views: 1928 copyright and disclaimer

core tip: a beautiful design work is undoubtedly the crystallization of the wisdom and Inspiration of designers, but there is a considerable distance from "design work" to "printed product". There is no doubt that a beautiful design work in this paper is the crystallization of the wisdom and Inspiration of designers. However, there is a considerable distance from "design work" to "printed product". Starting from the actual production, this paper summarizes the basic elements of the printing process that should be considered in the prepress design, so as to realize the seamless connection between prepress and printing, as well as after printing, and provide customers with high-quality and low-cost services with high quality and efficiency

prepress, printing and Postpress are the three major processes of modern printing technology, and each process directly affects the normal operation of its subsequent processes. Any printing product cannot be separated from the cooperation of various processes. Scientific and reasonable early process design has a multiplier effect on the process of later processes, and plays an important role in ensuring product quality and improving production efficiency

1. Printing type

when designing products, we should first consider which printing type the designed products will adopt. The process characteristics of different printing types are completely different

taking the four major printing methods as an example, offset printing has rich and delicate performance levels, the outline of embossed products is clear, the strokes are powerful, the ink color is bright, gravure printing has clear lines, fine and beautiful, the ink layer of silk screen printing is thick and convex, and the concise color blocks and lines of flexo printing products cause a strong visual impact. Different printing types have their own specific design requirements, which must be considered in the design

for the design of offset printing products, designers have more contact and relatively rich experience. They mainly pay attention to these points: whether the resolution of the image is sufficient; Whether the trapping value is suitable; For small text, try to avoid four-color superposition, so as not to increase unnecessary printing difficulty; Whether the regular line, cutting line, etc. are complete; Try to avoid designing large format full-scale field color patches; The direction relationship between graphics and text and paper fiber, fully considering the requirements of post-processing, etc

gravure products should be designed to avoid multicolor overprint. Because most of the substrate materials used in gravure printing have great thermal flexibility, coupled with thermal deformation in the process of high-speed printing, it is more difficult to print overprint. Therefore, when designing patterns, we should try to avoid multicolor overprint without affecting the design effect of various plastic granulators. In addition, some materials are not only flexible, but also have poor ink adhesion

in the design of flexo printing, if the original product is offset or gravure printing, when considering the use of flexo printing, we cannot simply copy the previous design scheme to blindly pursue the printing effect of offset and gravure printing

when designing flexographic prints, the following aspects should be avoided: avoid designing too small words and too thin lines; Avoid overprint of lines and words with two or more colors; Avoid designing small anti white words and lines; Avoid broken highlights or 1% dots in the picture; Avoid designing words or lines in bitmap software such as Photoshop; Avoid designing wide and long fields and gradients along the horizontal direction of the printing drum; Unless otherwise required, avoid putting a large area of field on the same page with dots and small text, etc

the heat coefficient of silk is high. In principle, the originals used in product design are not very different from those used in other printing methods, but in specific plate making and printing practice, their requirements are different, which is mainly determined by the printing characteristics of silk. In particular, due to the thick ink layer and bright color of silk printing, the special effect of silk printing should be fully considered when selecting originals and plate making

in addition, the requirements for line and dot accuracy of the original used in silk printing are also different from those used in ordinary printing methods. If the lines and dots of the original are very fine, it is very difficult to use silk printing for plate making. Therefore, silk printing technology is not suitable for reproducing originals with fine lines and dots

in the process of silk printing and plate making, pay attention to the selection of appropriate lines in order to fully reproduce the original. Silk printing is more suitable for monochrome chromatic originals with bright words and lines, and it is also suitable for color originals with large contrast and clear layers

through the special effect of silk printing, the replica has rich expressiveness, and fully expresses the texture and three-dimensional effect of the original content through rich and thick ink layers and the light and dark contrast of tones

2. Material selection

when designing products, the packaging materials used must be consistent with the product market positioning, and the purpose of achieving the best packaging effect with the lowest cost must be achieved. When selecting materials, on the one hand, we should consider the variety of materials, on the other hand, we should consider the specification of materials. Different kinds of printing materials have great differences in their printability, even completely different, and their actual performance effects on products are also very different

the specification of materials is also an important aspect that affects the cost of products. For example, because different businesses need different varieties and specifications of paper for packaging trademark printing, it is often necessary to reserve dozens of different varieties and thicknesses of paper

3. Color and resolution

when choosing color, it is necessary to consider the actual reproduction effect of printing, for example, try not to use the color in the purple acrylic court color system. The reason is that the purple color obtained after the superposition of cyan ink and magenta ink in the printing ink is generally "dirty", which is difficult to achieve the color shown to the customer in the computer display when designing the pattern or the color effect expected by the customer, and it is easy to cause quality accidents related to the color

if it is really necessary to print the ideal purple color, it is either recommended to use pink ink for superposition during design, or use spot color printing. If the designed product is in the experimental stage of new launch in the sales process, customers can be advised to use spot color to print the main color of the packaging, which can not only improve the brightness of the packaging pattern and color, but also reduce the risk of sluggish sales once the main color of the packaging is inconsistent with the popular color of the packaging market (if the main color of the product is printed with spot color, the main color of the packaging can be changed at any time according to the market needs in the sales process). In the graphic design of printing, the setting of resolution must be determined according to the requirements of design and printing process, especially the printing materials (mostly paper) and other factors. Not all pictures must be adjusted to the highest resolution. For example, the printing line of newspapers is lower than that of exquisite picture books, and their requirements for the resolution of image files are also different. If the resolution of the pictures on the paper printed newspaper is adjusted to the same resolution as the picture album printed on coated paper, it is not only meaningless, but also leads to printing paste

in the graphic design of printing computer, the resolution of different objects is set as follows:

the color or black-and-white newspaper printing line printed on general paper and offset paper is 60-100 lines, and the design resolution is 120-200dpi; Generally, color pictures printed on offset paper, pictorial newspaper, coated paper, paperboard and whiteboard, such as book covers, pictorial, product advertisements, etc., with 150 printing lines and a design resolution of 300dpi; High grade books, exquisite picture albums, and high-grade advertising prints are printed on high-grade coated paper. The printing line can reach more than 175 lines, and the design resolution is 350dpi; Boutique books, special securities, special notes, etc., with a design resolution of 400DPI

4. Typesetting scheme

designers must provide customers with a reasonable typesetting scheme according to their needs. For example, the market prospect of the products designed in flexographic printing is promising, and the product packaging has a large print volume at one time. Customers can be advised to vertically arrange multiple unit patterns, and improve the printing efficiency by increasing the circumference of the plate cylinder

when typesetting, pay attention to the direction of the paper, such as the trademark of bottled wine. Because it is mechanized labeling, it is fast. When the back of the paper is automatically glued and wet, it will instantly deform and bend. The bending direction of the paper should match the automatic labeling machine, otherwise it cannot be produced on the automatic assembly line

therefore, in order to meet the needs of different customers, the horizontal and vertical wires of paper must be considered first when assembling and typesetting, so as to prevent the produced trademarks from being scrapped because they do not meet the requirements of customers

packaging trademark printing is significantly different from book printing. From the definition, we can see that the different characteristics are one page, one picture and multiple collages. At least connect two graphs, and at most connect dozens of graphs. In the end, it is more appropriate to combine several drawings for printing, which is the problem to be considered in design and process. It is mainly considered from the following aspects

difficulty of post press processing

if there are many post-processing processes for a manuscript, it should be carefully considered not to make the printing layout very large. Otherwise, due to the poor control of temperature and humidity in the printing workshop, it is easy to cause the paper to stretch, so that the aluminum ironing and embossing of the next process are difficult to overprint accurately, resulting in the aluminum ironing and embossing that should be done once, and the pressing and embossing must be done several times. In addition, there are many collages and paper deformation, which will seriously affect the registration and is difficult to remedy

special shaped trademarks

trademark stickers are generally not large. For thin paper special-shaped trademarks that need die cutting, do not make too many collages, otherwise the quality of die cutting will be affected due to the accuracy of die-cutting plate production

printing quantity

if the printing quantity is small, don't make too many collages. Because the layout is too large and the printing quantity is very small, the cost of die-cutting plate is high, which will inevitably increase the cost of single label

paper opening number

the size of the packaging paper is consistent with the paper size, so the printing paper is very standard, and there is no waste. The packaging trademark is not the case. Due to the influence of the size of a single label, it is impossible to accurately spell it into octave, quarto and folio printing. Therefore, whether to adopt the splicing methods such as plug splicing, horizontal and vertical splicing, set splicing, one knife punching, knife drawing, etc. is based on the principle of saving printing paper as much as possible. Choosing a good process splicing method can directly create profits for the enterprise