Digital printing works in much the same way as inkjet printers, and inkjet printing technology dates back to 1884. In 1960, inkjet printing technology entered a practical stage. In the 1990s, computer technology became popular. In 1995, a drop-on-demand inkjet digital jet printer appeared. In 1999-2000, digital jet printing machines using piezoelectric nozzles were exhibited in many countries. At present, the development of digital printing technology is showing a trend of rising and blooming. 】
In recent years, China's textile printing and dyeing industry has developed at a high speed, and the printing output has also increased simultaneously. At the same time, the fashion cycle of clothing is getting shorter and shorter, the pattern changes are getting faster and faster, the production requirements are getting higher and higher, the order quantity is getting smaller and smaller, and the pattern piracy is rampant. Although printing companies have introduced digital systems such as printing CAD systems, laser imagesetters, flat screens, rotary screen inkjets, and wax-jet netting machines to improve the processing process in traditional printing methods, the concept of a printing and dyeing factory is a polluting factory. Has been impressive. At the same time, the export of printing and dyeing products in China is increasingly hindered by “non-trade barriers†including the environment. As far as current technology is concerned, digital printing is the best way to solve many problems in the printing field.
Traditional printing is inseparable from the use of flat nets and round nets. However, the cost and time consumed by plate making cannot meet the trend of modern printing in small batches and varieties, so it develops a digital version without pressure. printing. The basic principle is the same as that of an inkjet printer.
Inkjet printing technology dates back to 1884, when American CHRichard put water in the syringe and applied a pressure needle to fly out the droplets. If the droplets were controlled in the direction of the droplets, an image could be formed on the paper, called a fog ink print. At that time, because of problems with needles and inks, the effect was very poor. It was not until 1960 that it officially entered the practical stage. Inkjet technology was used for bar code processing or product serial number printing ten years ago, called the printer.
Digital Jet Printing is a systematic project involving cutting-edge technologies such as CAD technology, network communication technology, precision machining technology and fine chemical technology. It is the product of the integration of information technology with traditional technologies such as machinery, textiles and chemicals.
Since digital jet printing technology involves a large amount of calculation and control, it can be said that digital jet printing technology cannot be realized without today's high-speed computer. For now, the development of digital jet printing technology is basically in sync with the working ability of computers. However, the development of computer technology still has no signs of weakening. With the development of computer technology, it is expected that the future digital jet printing technology will also have high speed. development of. At the same time, the manufacturing technology of the nozzle also benefits from related technologies of integrated circuits, such as etching and precision assembly. This is evidenced by the constant emergence of modern high-frequency, multi-nozzle nozzles.
In the 1990s, computer technology was gradually popularized, and continuous digital jet printing machines appeared. By 1995, there were mature applications in rough textiles such as carpets and wall hangings. Austria ZIMMER company took the lead in exhibiting a digital jet printing prototype for carpets with a resolution of 9-18, using valve spray technology, without the use of nozzles in the usual sense; its production speed is fast, 16/min. However, because the spray droplets are large, the resolution is very low, and it cannot be applied in the fabric.
In 1995, a drop-on-demand inkjet digital jet printing machine appeared. At that time, it mainly used a thermal bubble nozzle with a resolution of 300 dpi. Later, it gradually developed to 600 dpi. The four colors were mainly used, which can be applied to fabrics.
In 1999-2000, digital jet printing machines using piezoelectric nozzles were exhibited in many countries, including the Netherlands, Japan, Switzerland, the United States, Italy and China Honghua. The resolution can reach 360~720dpi, 6/h, due to The minimum ejection amount of the piezoelectric nozzle is very small, the product pattern is finer, and the color is more uniform and natural, so it is popular and the application surface is gradually expanded.
At present, various new digital jet printing machines have appeared, mainly using piezoelectric nozzles; the highest printing speed has been developed from 1/h in 1990, 6/h in 2000 to 0 80-150/h; using dyes from 4 colors. Developed to 6-8 colors and 2X6-8 colors; the application process is increasingly mature; the control software functions are gradually improved. It can be seen that the development of digital jet printing technology basically changes from continuous shooting to on-demand jetting, from thermal bubbler to piezoelectric nozzle, and from 4 to 6-8.
Undoubtedly, the emergence and successful application of digital printing technology is undoubtedly a major technological revolution in the textile industry. It has a milestone significance. The economic and social benefits brought by digital printing will have a profound impact on the world, especially the textile printing and dyeing country. Impact. As with previous industrial upgrades and changes, the emergence of new digital jet printing technology is both a challenge and an opportunity, and Chinese textile companies must seize the opportunities in the upcoming changes.
First, the concept of digital printing technology
Digital printing technology is a high-tech product integrating mechanical and computer electronic information technology with the continuous development of computer technology. It first appeared in the mid-1990s, and the emergence and continuous improvement of this technology. It has brought a new concept to the textile printing and dyeing industry. Its advanced production principles and means have brought an unprecedented development opportunity for textile printing and dyeing.
In short, digital printing is to input the pattern into the computer through digital form, edited by computerized color separation system (CAD), and then controlled by computer to control the micro-piezo nozzle to directly spray special dye solution. On the textile, the desired pattern is formed. The promotion and application of digital printing technology will have a major impact on the development of China's textile industry in the 21st century.
(1) Promote production methods and business models of enterprises
For a long time, due to the limitations of traditional crafts, the production of printed products must reach a certain scale and quantity, and enterprises will have benefits. With the development of the economy, the market demand is becoming more diversified and personalized. The emergence of digital printing technology has solved this problem that has long plagued enterprises. In the past, a product took several days or even dozens of days from design to delivery. Now the customer has selected the pattern and fabric, and the finished product can be obtained in one to two hours, which can better meet the individual needs of the consumer's wearing or decoration. It is predicted that digital technology in the 21st century will be combined with network technology at the fastest speed to achieve a fully personalized, one-to-one tailor-made business model.
(2) It will satisfy people's individual needs to the greatest extent and improve people's quality of life.
For the majority of textile designers, it is a tool that makes excellent use of individual creativity, enabling them to fully demonstrate their creative abilities and turn the best works into reality. The digital printing is rich in color, with four colors and spot colors, which can print 16.7 million colors. For the majority of consumers, from home decoration to clothing, travel goods can be personalized according to personal preferences. In this sense, the emergence of a new technology will also drive a new market and stimulate a new round of consumer demand.
(3) Digital printing will directly promote the development of “green textiles†and “green manufacturingâ€.
Because the digital printing is directly loaded into the special box and sprayed on the fabric as needed, it is neither wasteful nor waste water pollution, and the dyeing liquid discharged by the printing machine in the mixing room is eliminated, and the printing process is free from pollution. Film was also omitted. Wire mesh, silver tube and other materials are consumed. It not only reduces the burden on enterprises, but also fulfills the requirements of environmental protection.
Second, the characteristics of digital printing technology
The production process of digital printing is simply written into a computer by various digital means such as scanning, digital photo, image or computer processing, and then processed by computer color separation printing system, and then passed by dedicated RIP software. The printing system directly prints various special dyes (active, dispersed, acidic main paint) onto various fabrics or other media, and after processing, obtains various highs on various textile fabrics. Accurate printing products have the following advantages compared with traditional printing and dyeing processes:
1. The production process of digital printing greatly shortens the original process route, and the ordering speed is fast, and the proofing cost is greatly reduced.
Since the production process of the digital printing is free from the process of color separation, production, and web making in the production process, the production time is greatly shortened. The way to accept the pattern can be through CD, E-mail and other advanced means. The general proofing time is no more than one working day, and the traditional proofing period is usually about one week.
In addition, the cost of proofing is greatly reduced due to the simplification of the process. The shortening of the proofing cycle and the reduction of the cost of proofing are under the market competition law of today's time, and efficiency is the life of the market competition law, which undoubtedly brings more market opportunities to enterprises.
2. The principle of digital printing technology makes its products break the limitation of traditional production of color and flower length, which can make textile fabrics achieve high-grade printing.
Since the digital printing technology can adopt digital patterns, the color measurement, color matching and printing of the digital printing products can theoretically reach 16.7 million colors, which breaks through the color limitation of the traditional textile printing and dyeing patterns, especially in the color. Digital printing is technically unparalleled in the printing of high-precision patterns such as gradation and moiré. In addition, the traditional printed pattern is often limited by the length of the “flower backâ€, and the concept of “flower back†can be eliminated in the process of digital printing, which greatly expands the space of textile pattern design and improves the grade of the product.
3. The digital printing production truly realizes the production process of small batches and fast reaction, and the production batch is not subject to any restrictions.
Since the digital printing production process is fully computerized digital production, the production flexibility is greatly improved, and some products can even be delivered on the same day, and it is desirable. In addition, due to the application of computer technology, printing a series of patterns of different patterns in the same pattern, as well as the designer's continuous modification of the color of the pattern in the production process has become a major technical advantage of the digital printing production which is different from the traditional printing production.
4. The high-precision printing process eliminates the need for color paste during the printing process.
The use of dyes in the printing process is “as needed†by the computer, so that there is no waste of dyeing materials and no waste water during the printing process. No noise is generated during the printing process controlled by the computer, so that the printing process is in progress. No pollution is generated, and the green production process is realized, so that the production of textile printing can be freed from the production process of high energy consumption, high pollution and high noise in the past, and the production process of low energy consumption and pollution is realized, which brings about the production of textile printing and dyeing. A technological revolution.
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