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Packaging design and printing technology

the ever-changing computer design and prepress printing have made the traditional hand-painted design a history. Network transmission and digital printing have also opened up design ideas and enriched design means for designers, but many new problems have emerged. Many technical factors have never been encountered by previous designers. Packaging design is a systematic work, involving many factors, such as materials, structure, graphic design and manufacturing process, which is by no means as simple as drawing an image. Therefore, packaging design in developed countries is usually completed by a team. There are not only packaging professionals who understand materials and structures, but also graphic designers, sales personnel and engineers from production enterprises to participate in the opinions, so as to make the design perfect and realize in production

there are some misunderstandings in the practice of packaging design in Chinese enterprises, which are mainly manifested in emphasizing the plane and neglecting the structure; Emphasize the design effect, light the manufacturing process, etc. The direct cause of this problem is that the packaging design in China is mainly completed by designers. Almost all of these people were born in fine arts and had great limitations in their understanding of materials, structures and processing techniques. The continuous emergence of new materials and new processes can broaden the creative space of designers, but it is also a challenge. The rapid development of new design means, printing methods and prepress technology has also had a profound impact on the design activities of designers. New technologies such as computer design, networked transmission and digital printing have a direct impact on the design work of designers. Therefore, packaging designers must be aware of possible problems in the design process in the new environment. Before using the computer for page design, we should discuss with the prepress service provider and the printer to decide whether to use hard copy documents or electronic documents

if it is decided to use electronic documents, the font is the main factor determining whether the design operation can be displayed during output. Whether to select TrueType font, postscript font or Unicode font must be discussed with the prepress service provider and printer to avoid possible problems in the output process of the font used. If possible, convert fonts into graphics in EPS (compressed page description file) files. For prepress service providers, the general problem is the placement or page description errors caused by fonts when importing EPS files. But avoid nested EPS files. EPS files containing other EPS files may cause output errors or increase the output time to avoid operator injury. Simplify the problem by copying from one EPS file to another and populating elements instead of using the import or insert function. The use of reverse fonts reverse fonts are often used, but care should be taken that (9) buildings do not directly use this motor source block. Most inverted fonts are hard to read. Be especially careful when reversing fonts by processing color images. These images usually contain light and dark areas, which makes the inverted font difficult to read. Please refer to the output section and the technical manual for more information about trapping. In the shadow part of the font, use a color that is more prominent than a material that can achieve green building energy conservation, and the point and surface meridians shall be at least 70%. In addition, to ensure that inverted fonts are readable, avoid using small or fine fonts. The font size shall not be less than 6 points or the thinnest part of characters shall not be less than 0.007 inch. Sans serif and bold are the best choices for reversing fonts. Is OPI or apropi (open printing interface) or APR (automatic image replacement) the most accurate way to locate the output image of the page/P

if the prepress service provider supports OPI or APR, they will scan the image for you and give you a low resolution image to locate the page output file. When you send the job to the prepress service provider, their software will automatically match and replace the low resolution image with the high resolution image. This workflow can provide you with smaller files, which can be operated faster and easier. See the page output section for more information about using OPI and APR files. The influence of post-processing on output should be considered in the planning and design stage. For example, what kind of coating material is used, and whether special effect treatment is required, such as bronzing, embossing, silk printing, coating, etc. In addition, if more post-processing is required, the operation time shall be considered to allow time for completion. Printing on the digital printing press is gradually developing to the full digital printing workflow in the industry. Digital printing has become more and more widely accepted

digital workflow can not only reuse files or use them for new purposes, but also allow files to be transmitted and printed over long distances for different output media, such as printing, CD-ROM or interconnection. Digital printing no longer has the traditional and time-consuming production steps: film production, composition and preparation. Another powerful advantage is that it allows short version color printing on demand. With the help of appropriate front-end software and hardware, the digital printer allows the image and format to change, allowing the image to change every time it is printed. The digital printing system is different from the traditional printing system in several aspects, such as paper size, printing process, and the use of ink. To obtain the most appropriate results, these variables should be considered in the design stage. Be sure to contact the printer and consult the manufacturer for detailed critical areas of their specific digital printing system. The design technique of combining digital printing with traditional offset printing if an operation needs to be done this way: the preprinted materials through the offset printing machine should be used for digital printing equipment, such as laser printer, color photocopier or digital printer. Then check the paper specification of the digital printing equipment. If possible, use white paper with a smooth coating. It is not recommended to use colorants that are unevenly distributed on rough paper surface, textured paper and convex paper; Pay attention to the printing ink used

with the traditional printing ink pre printing method, when the fusion roller is copied at high speed, the extreme pressure and temperature are easy to make the eyes blurred. Ink suppliers can provide oil-based, heat-resistant inks for digital printing. To avoid metal ink and fluorescent ink peeling and increase the hot melt roll; Be careful that the colorant does not stick to the large ink area. Digitally printed images should be printed directly onto paper. Design skills of digital printing these devices are easy to process continuous tone images, so they can be used for a large number of pictures. Be sure to convert all images to CMYK format. As the most predictable color, let the printing service provider scan, and their scanner has been calibrated relative to the output device. Avoid areas with large color patches. If you have to use a large area of color image in the digital image, you can print it quickly? Changes in color) to produce some texture. Pay attention when using spot color or other special colors (such as metal color). Some digital printers can process spot colors, while others convert spot colors to the nearest CMYK value. Avoid using metallic colors because no CMYK values match. Some printing services will provide spot color area distribution tables generated by their digital printing systems. There is no traditional printing method for packaging printing in common use. Almost all printing methods can be used in the packaging industry. Offset printing is the most used, accounting for 45%; Followed by flexographic printing, accounting for 28%; Then gravure printing, accounting for 20%; Other printing methods, including digital printing, currently account for only 7%. The traditional printing method of folding carton is mainly offset printing. In Europe, the share of this method in the industry is 80%, while in the United States it is 73%. The proportion of flexographic printing is increasing. This trend mainly comes from the supplement to gravure printing defects, and some comes from the supplement to offset printing defects. At least compared with gravure printing, this method has greatly reduced the time and cost of plate making. New printing methods such as inkjet and digital printing are still in the development stage

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