Pre-press design and plate-making process characteristics of gravure packaging
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There are big differences between prepress printing and gypsum printing and screen printing. In today's computer-aided design and production, it is very important for graphic designers to master the prepress process when designing gravure packaging. Otherwise, , will seriously affect the normal progress of design and production work and print quality.
The following sub-items analyze the characteristics of pre-press design and plate-making process of gravure packaging:
1. Standard document settings.
The packaging layout should be set up in accordance with the technical procedures of the standard documentation. The contents of the standard documents include the basic elements such as document specifications, bleeding position, cutting line, set line, color mark, etc. The layout specifications must meet the requirements of the required packaging product specifications, plate making methods, substrates or paper opening specifications, post processing, etc. It is set according to the process rules to facilitate the specification of processes such as electronic imposition, printing, post-processing and quality inspection, so as to improve efficiency, save resources, reduce costs and improve quality.
2. Color pressing process.
In gravure, the color is processed between different color blocks on the layout. What is the color-pressing coloring is to ensure that the printing overprint is accurate, or that the running plate is not caused by the overprinting deviation within a relatively small misregistration, but between two contact colores or two The colors that do not contain the same component are set to overlap each other. The data portion of the overlap has relevant process specifications. For example: the dark color is light, the light color is enlarged and penetrated into the dark color, and the dark color is unchanged. The enlarged data is even larger, generally 0.3 to 0.5 mm; the dark color is dark or Light color and light color should be mutually infiltrated, and the expanded data is usually about 0.2mm. There are also some complicated situations, such as the processing of the outer contour and adjacent color of the design element including the character, and the priority of the character's 9l contour. To determine the expansion, and so on. In general, the basic principle is to determine the process application depending on the color and design elements of the specific layout. Different printing substrates have different data for the color-pressing process.
3. Word processing technology.
The quality of the printed part of the text directly affects the accuracy and efficiency of information expression and delivery]. The word processing of gravure packaging design has strict technical knowledge. Such as: text size control, font settings. If the text is too small, it is easy to paste in one piece. The thickness of the horizontal and vertical strokes of different fonts is different; the fine text of the stroke is easy to break the stroke or completely lost in the electronic engraving, and finally the text is not clearly printed or completely printed; Try not to use multi-color mixed filling for small text and explanatory text. Try to use a single color. The reason is that multi-color overprinting in printing plates is easy to cause the running position, which seriously affects the quality of printed matter; dark color is not suitable for dark colors. Text, light color is not suitable for light text; when there is a computer-aided design draft, the text of the layout generally has to be converted (or called curve or rasterization) because of different corporate organizations (design, Plate making, printing) In the same business process, each stage may not display the required text content correctly due to the different fonts or lack of necessary fonts, and garbled characters may affect the work process. Text is one of the basic elements of layout, and the common sense of text use and processing is very important for every design and plate maker.
4. Color and mesh use process.
The color printed on the plastic film is the first visual element of the packaging. The customer's feeling of the product is first of all color, and the color reproduction effect is good, which will easily stimulate the reader's vision and awaken the reader's desire to purchase. The setting of the deep and shallow mesh of the color flat net should consider the loss of color when the gravure plate is made. When hanging the net, the shallow net is easy to lose during plate making, and it is not easy to control when printing; the transition processing of the gradient net, pay attention to the transition naturally, do not step, not too steep, the transition should be natural and soft; The length, color depth and gradient direction will have a certain quality impact on plate making and printing.
5. Barcode process.
The commodity barcode is a barcode for the identification of the product, specifically a modular combination code for indicating the international common commodity code. The source of the barcode is usually computer software embedded or barcoded film, which is synthesized into a design layout by computer aided design or hand-imposed. Barcodes like text ~ sample attention to color and line thickness processing, scaling and placement direction (related to the printing direction) are also specified, the product bar code amplification factor is 0.80 ~ 2.00, the bar code symbol with the magnification factor changes Or shrink. The reading of the bar code is realized by distinguishing the boundary and the width of the bar space. Therefore, it is required that the contrast of the color of the bar and the space is as large as possible, and the red color cannot be used as a stripe color, and the gold cannot be used as a stripe color and cannot be used as an empty color]. Improper handling of the barcode will result in the packaging of goods in the mall can not pass the detection equipment, can not read the information of the goods.