Preparations before the most popular seal

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Prepress preparation

vividly and concretely explain to you the preparation before printing, the places that need to be paid attention to in all aspects before printing, and the considerations that should be paid attention to before printing should be considered from the aspects of paper, ink selection, process selection and so on. 1. Before going out for printing, you should choose the printing method first. Because each printing method uses different paper, ink and printing machine, different processes, different printing effects, different materials to be provided, and different printing prices. For example, ordinary offset printing (hereinafter referred to as offset printing) can be selected for general advertising pages and product introductions of the company, offset printing or silk printing technology (hereinafter referred to as silk printing) can be selected for corrugated packaging, intaglio printing (hereinafter referred to as intaglio printing) or flexographic printing (hereinafter referred to as flexographic printing) can be selected for plastic film flexible packaging, silk printing or large-scale inkjet printing can be selected for giant color advertising printing, and relief printing (hereinafter referred to as embossing) can be selected for curved objects Gravure printing or silk screen printing, etc

2. Before computer design and production, we need to prepare the text and image manuscripts needed in the production (including the company logo and the registered trademark of the product required for production. The image should be clear, preferably the reverse film and photos. The printed manuscript produced by the printer cannot be used as the image manuscript, because its resolution is low and the effect after scanning is poor), color requirements (mainly the unchangeable color, it is best to mark the value of CMYK), if the page has been designed, You need to provide specific layout, including page size, image size, text size and color, color block size and color. The color mentioned here is best marked with CMYK value

3. When designing your own page, you should pay attention to the choice of finished product size. Before deciding the size of the finished product, you need to decide how many pieces of machine to print and what paper to use (large size paper or positive size paper). How many pages can be arranged on a piece of paper. If the size is different and the arrangement on a piece of paper is not enough, it will cause the spread of paper

4. Before production and output, it is also necessary to confirm the number of colors printed and whether there is spot color. Generally, the printing is four colors, namely CMYK four colors. Printing completes the reproduction of various colors in the natural world through the superposition of these four colors. However, in some cases, some spot colors, such as gold and silver, can be added to copy the colors that are difficult to be displayed by four-color superposition. At the same time, when using spot colors can reduce the number of printing colors, spot colors can also be used. For example, there are only red and black colors in the page, and red is generally reflected by m+y. in this way, printing requires three colors, and printing with spot color red is two-color printing, which can save a department

5. If you have finished the production, you only need to output and print. In each of the published two articles, the resolution required by each printing process is different, but the required file mode is CMYK, and RGB mode output is not allowed. Ordinary offset printing generally requires an output of more than 133lpi, so the image requires more than 260dpi, and low resolution will affect the printing effect; Silk screen printing generally requires a low number of output lines, about 30lpi and 60lpi, so the requirement for image resolution is also low, generally around 100dpi; The requirements of flexographic printing should be selected according to the printing materials. Generally, the image resolution of corrugated paper is 120dpi 150dpi, paper is 150dpi 180dpi, coating paper and self-adhesive paper are 180dpi 200dpi, graphene is superior in physical and chemical properties, plastic and metal films are 200dpi 260dpi, and general dot printing products are more than 260dpi

6. You also need to pay attention to bleeding, embossing, trapping and other issues when making your own pages

in addition, it is also important to consider the number of copies before printing. A. loading speed and its error loading speed and its error are important indicators for different printing methods. The number of prints is different (the number of starts refers to the cost of printing, except the cost of paper, and the lowest cost of other costs is calculated by the number of prints). For example, the initial printing number of offset printing is 3000 and 5000, lower than which the unit price of printing is relatively high; The starting number of silk screen printing is 300, and the printing resistance rate of silk is 3000 (the printing resistance rate refers to the maximum number of silk that can be printed). If it exceeds 3000, the silk needs to be replaced

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