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Inkjet printing (ink-jetprinting) is a non-contact, non-pressure, non-printing printing technology. It has the common characteristics of non-version digital printing and can realize variable information printing.
Screen printing (screenprinting) printing plate is mesh-shaped, printing ink on the printing plate under the squeeze of the squeegee from the plate through the hole part of the leakage to the substrate, and then complete the printing method of printing operations.
1. Introduction of two printing methods
1. Inkjet printing
(1) The principle of inkjet printing
There are many inkjet printing methods, and the basic principle is to input the graphic information stored in the electronic computer to the inkjet printer first, and then through a special device, under the control of the electronic computer, the nozzle sprays mist onto the surface of the substrate The ink droplets in the shape are directly imaged on the surface of the substrate according to the charge effect and become the final printed matter.
(2) Classification of inkjet printing
â‘ Classified by inkjet system
The basic principle of inkjet printing is to first generate small ink droplets and then guide them to the set position. According to the difference of inkjet system, it can be divided into continuous type and on-demand type.
Continuous inkjet printing (CIJ), whether printed or non-printed, continuously generates ink droplets in a flowing manner, then forms an image by electric field deflection transfer, and finally recovers or disperses the non-printed ink droplets .
On-demand inkjet printing (DOD), ink droplets are generated only in the printed part. Dedicated to printing excellent quality images, suitable for packaging color images, textiles and large format billboards, it is an ideal choice for full-color, high-precision printing, and printing quality is its most important consideration.
â‘¡Classify by printing color
According to its printing color, inkjet printing can be divided into black and white inkjet printing and color inkjet printing. Black and white inkjet printing uses a single ink, the machine structure and ink system are relatively simple, and color inkjet printing is relatively more complicated.
2. screen printing
(1) Principle of screen printing
Modern screen printing technology is to use a photosensitive material to make a screen printing plate through photo-engraving (making the screen holes on the screen portion of the screen printing plate through holes, but not the screen holes on the non-graphic portion) ). When printing, the ink is transferred to the substrate through the mesh of the graphic part through the squeeze of the scraper, forming the same graphic as the original.
(2) Composition and equipment characteristics of screen printing
Screen printing is composed of five major elements, namely screen printing plate, squeegee, ink, printing station and substrate. The equipment of screen printing is simple, the operation is convenient, the printing and plate making are simple, the cost is low, and the adaptability is strong. Screen printing has a wide range of applications. There are also many common printed products, such as color oil paintings, posters, business cards, binding covers, commodity signs, and printing and dyeing textiles.
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Second, the comparative analysis of the two printing methods
Inkjet printing is another new universal printing technology after screen printing. Like screen printing, it has a wide range of printing materials. It can be printed on different shapes and different materials. It has strong adaptability. At present, the technology is developing very rapidly The ever-expanding new printing methods show great development prospects. However, as an old-fashioned printing method, screen printing also shows its strengths in the development process, especially the unique advantages of screen printing in circuit board printing. The application of screen printing makes the screen printing look old and new, still occupying the vast market.
1. Competition between the two printing methods
(1) Competition in application areas and product markets
Based on the advantages of the two printing methods, it is not difficult to find that they are increasingly competitive in the printing market. First of all, some large-format printing fields compiled by screen printing are being impacted by inkjet printing. Today, the largest format of the inkjet machine used in the field of large-format inkjet printing can reach 3 to 5m. Products, outdoor advertising has become increasingly prominent. Secondly, because inkjet printing has relatively small restrictions on substrates, it can be printed on a variety of substrate materials. This is a killer skill of screen printing compared to other printing methods. Inkjet printing has this advantage and will undoubtedly The field of application of screen printing has an impact. Thirdly, inkjet printing is a fully digital printing, completely detached from the tedious procedures of the traditional printing process, which can minimize the time to market of products. This printing method will be the best for products with high time requirements. select.
(2) Competition for printers
Inkjet printing has its unique market, such as lottery printing, personalized printing, etc., which is unmatched by screen printing. While defending these fields, inkjet printing extends its application to the territory of screen printing, and the products are gradually being received. Favored by the majority of printers. As mentioned above, in the aspect of large-format printing, with the prosperity of the market economy and the expansion of commodity circulation, the inkjet printing of outdoor advertising will show a significant upward trend. The advantages of fully digital inkjet printing, personalized printing and off-site printing will inevitably attract more printers to adopt it. Therefore, it can be said that while competing for the product market, their competition is also inseparable from the competition for printers.
2. Complementary advantages between the two printing methods
With two methods, it can save production time and improve efficiency. Although inkjet printing has the advantages of full digitization, short job preparation time, and quick response to the market, it is not perfect after all. A major disadvantage of inkjet printing is that it is not suitable for large-scale printing, but only for less than 1000 Zhang's printing, therefore, the technical advantages of screen printing in mass printing are revealed to the fullest. This method can be used when determining the personalized printing of product packaging, that is, using inkjet printing for small batch printing, investing in the market and conducting research, and selecting popular designs based on the results of the research and then mass production. Printing, which not only saves costs, but also reduces waste and time to market. The collocation described above is only an option, and of course there are other better ways to use it together.
3. The unique advantages and application fields of inkjet printing
The development of inkjet printing has impacted on the position of screen printing, and it has not forgotten to develop the market with unique advantages. In the following several printings, inkjet printing is the main method. Inkjet printing in these fields Printing is irreplaceable by other printing methods.
(1) Lottery printing
Lottery printing has only become popular in China in recent years, such as sports lottery tickets, welfare lottery tickets, and various commercial papers with variable data such as random numbers, bar codes, and two-dimensional codes, all using inkjet printing. This printing method can adapt to papers of various thicknesses. At the same time, the ink can penetrate into the paper fibers. The winning information on the lottery ticket can prevent alteration and fraud.
(2) Digital proofing
Although many specialized proofing devices have been introduced on the market, with the advent of large format inkjet printers, large format inkjet printers have now been widely adopted as proofing devices. The use of inkjet technology not only requires less investment and speed, but also the quality of the output image is similar to the quality of the final product, which can meet customer requirements.
(3) Personalized printing
With the prosperity of the economy and the improvement of people's living standards, many personalized albums, commemorative albums, desk calendars, wall calendars, etc. have appeared. These prints with low printing volume, short time and low cost are printed on inkjet printers Is more appropriate.
In addition, the combination of inkjet printing and network printing, such as adding strength to the tiger, shortened the cycle of printing while minimizing the geographical constraints of printing, further opening up the printing market.
3. Future trends of the two printing methods
1. Development prospects of inkjet printing
Digital inkjet has a bright future in packaging and printing. Many packaging printing manufacturers and end users are exploring the application of inkjet printing in the packaging field. Inkjet printing can be performed directly on various media such as plastic bottles, metal foils, personalized corrugated boxes and shaped corrugated cartons, labels, etc. High-quality printing. To provide manufacturers of goods with variable information content displayed to consumers, provide low-cost production samples, and a small number of test-market products. In the future, inkjet printing will become a mainstream technology and adopted by the packaging and printing industry, and will play an important role in the future product packaging market.
The fully digital workflow of inkjet printing is in line with the development trend of digital printing and networking. We look forward to the arrival of a new era of digital inkjet printing. In the near future, inkjet printing technology will penetrate into a wider market and inject new vitality into the modern printing industry.
2. The development trend of screen printing
Although screen printing is an old-fashioned printing method, even so, its development is still attracting the attention of printers. The combination with modern printing methods is even more promising. Its development direction can be attributed to the following two aspects:
(1) Combine with traditional printing
The appearance of the combination of screen printing and other traditional printing methods determines that screen printing occupies a position that cannot be ignored in the field of packaging printing, and gradually becomes one of the main printing processes in the field of packaging printing. At present, the rotary screen printing unit with extremely high printing accuracy cooperates with the flexographic printing machine to make it more widely used in anti-counterfeiting printing.
(2) Combined with digital printing
In the late 1990s, computer digital processing technology continued to mature. There is a direct imaging plate-making method, which is to directly use a computer scanning laser to image on a special metal plate gold film. In this way, the silk screen and the photosensitive glue can be omitted, and no complicated screen making process is required. The template produced by this plate-making method is not deformed, aligned, and has high printing accuracy, which is also the future development direction.
4. Summary
Inkjet printing and screen printing cannot coexist because of competition between them. On the contrary, their combined use will have unexpected effects. With its advantages of full digitalization, personalized printing and remote printing, inkjet printing has unlimited prospects in the future printing field. With its advantages of wide printing range, strong ink tolerance and thick printing ink layer, screen printing still occupies a stable position in today's fiercely competitive printing market. Combining the two printing methods, only by advancing the advantages of each of the two printing methods and complementing each other's strengths can we shine in the future development of printing.
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