Inkjet technology revealed (one)
We are a big printing company in Shenzhen China . We offer all book publications, hardcover book printing, papercover book printing, hardcover notebook, sprial book printing, saddle stiching book printing, booklet printing,packaging box, calendars, all kinds of PVC, product brochures, notes, Children's book, stickers, all kinds of special paper color printing products, game cardand so on.
For more information please visit
http://www.joyful-printing.com. ENG only
http://www.joyful-printing.net
http://www.joyful-printing.org
email: info@joyful-printing.net
Currently, major manufacturers are targeting the inkjet printer market. They have stepped up their offensives through the development of new technologies, thus increasing the competition in the inkjet market to the level of technological competition. It is no exaggeration to say that each new series of products indicates that there is one or more new inkjet technologies. come out. Today, let's take a look at what makes inkjet technology that has been effective for users.
Inkjet method: foaming and piezoelectric technology are difficult to distinguish
The foundation of an inkjet printer is the inkjet method. According to the working principle, it can be divided into solid inkjet and liquid inkjet, and the main working mode of liquid inkjet printer is divided into foaming type and piezoelectric type.
The foaming technology is a high-temperature and high-pressure printing technique by heating a nozzle to generate bubbles of ink and spraying it onto a printing medium. The working principle is: using a thin film resistor, heating less than 0.5% of the ink in the ink ejection area to form a bubble, which expands at an extremely fast speed (less than 10 microseconds), forcing the ink droplet to be sprayed from the nozzle. Out. The bubble continues to grow for a few microseconds and disappears back to the resistor. As the bubble disappears, the ink in the nozzle retracts. The surface tension then creates a suction force that pulls new ink into the ink ejection area.
Experiments have shown that oil-based dye-based inks can print high-quality proofs. Foamed inkjet technology is a system that uses a mixture of water-based and oil-based dyes. It can be used in both home and commercial printers to achieve good print quality. The ability to reduce the area of ink drop ejection and integrated circuit cycling technology is expected to make inkjet printers using this technology smaller in size and more frequent in the ejection of ink droplets. Low operating frequency, high nozzle count and single print resolution are essential elements for high speed printing. Therefore, the foaming inkjet technology can improve the printing speed and improve the working efficiency of the printer. Continuously integrated circuit technology also allows foamed inkjet technology to continue to reduce costs while optimizing the entire printing process.
At present, the total number of nozzles of the foaming print head can reach several hundred or even thousands, each nozzle has the same diameter as the hairline, and the ejection droplet capacity is at least 4 pl. The ink heads of the three colors of green, yellow and yellow inks are often integrated. By combining several small color ink droplets, different sizes of ink dots can be formed, resulting in richer harmonic colors and smoother mesh. The black ink head is separate.
Since the ink cartridge and the ink are subjected to pressure by the hot air bubbles, the ink cartridge must be integrated with the nozzle, and the print head is updated at the same time when the ink cartridge is replaced. This way the user no longer has to worry about the nozzle being blocked. However, this also makes the cost of consumables relatively expensive.
The ink head adopting the foaming technology works in a high temperature and high pressure environment for a long time, and the nozzle is seriously corroded, and at the same time, the ink droplet splashing and the nozzle clogging are easily caused. In terms of print quality, since the ink is heated during use, the ink is easily chemically changed at high temperatures, the properties are unstable, and the color authenticity is affected to some extent; on the other hand, the ink is ejected through the bubble. The directionality and volume of the ink particles are not well mastered, and the edges of the printed lines are easily staggered, which affects the print quality to some extent.
At present, there are many products using foaming technology, mainly for products of companies such as Canon and Hewlett-Packard.
Piezoelectric inkjet technology belongs to normal temperature and atmospheric pressure printing technology. It places many small piezoelectric ceramics near the nozzle of the print head. The piezoelectric ceramic has the characteristics of stretching or contraction deformation under the voltage change of both ends. When it is placed on a piezoelectric ceramic, the stretching vibration of the piezoelectric ceramic changes with the change of the image information voltage, and the ink in the ink head uniformly and accurately ejects the ink under a steady state of normal temperature and normal pressure.
Compared with foaming technology, piezoelectric inkjet technology has the rules of ink dot shape, no sputtering, controllable dot size, controllable jet velocity, accurate positioning, more inks with different chemical compositions, less corrosion opportunities, The advantages of the life of the nozzle are prolonged, and pigment ink can also be used to prevent discoloration and fading caused by ultraviolet radiation. The ink specially developed for piezoelectric technology has solubility characteristics and quick-drying characteristics, can quickly penetrate into the paper, can not burr, and is not blooming, especially on inkjet paper and glossy paper, the printing quality is very good.
On the basis of piezoelectric technology, the manufacturer has developed Micro Piezo Technology, which has stronger control of ink droplets. The amount of ink ejected by this technology is only 1/3 of the usual. The minimum can be 2pl, and the shape of the ink droplets is more regular, the positioning is more accurate, the printing resolution is improved, and high-precision printing is easy to be realized, and the micro-piezoelectric inkjet does not need to be heated, and the ink does not undergo chemical changes due to heat, thereby reducing The requirements for ink.
Inkjet printheads fabricated using piezoelectric technology are relatively expensive, but because the pressure in the micropiezoelectric inkhead is small, the nozzles are actually replaced by piezoelectric ceramic wafers. In the micro-piezoelectric ink head, the nozzle and the ink cartridge are of a discrete structure, and one nozzle can support a plurality of ink cartridges, and the ink cartridge can be replaced only when the ink is replaced, without having to replace the print head. Of course, after the ink jet printer head of the piezoelectric technology is clogged, a large amount of ink has to be wasted to clean the ink head. Every time you change the ink head, you must first waste 30% of the ink to do the ink head cleaning. It takes 2 to 3 minutes to clean each time you turn it on, and you need to waste some ink. The gas meter requires the user to replace 17% to 25% of the ink when replacing the ink cartridge.
The main use of piezoelectric inkjet technology is Epson's inkjet printer.
Both foaming technology and piezoelectric technology have their own advantages and disadvantages. Most of the inkjet devices on the market are based on these two technologies, but to improve the printing effect and printing speed of inkjet printers, it is impossible to work on inkjet methods. Still - make a fuss about the ink drops
The development of technology to improve the quality of color inkjet printing has gone through several stages: the first stage is to pursue resolution; the second stage is to increase the number of ink drops in some products in order to increase the level of color in the image after the resolution reaches a certain level. The method to improve print quality; the third stage is to use tiny ink drop technology.
Tiny ink drop technique
The color drop of color inkjet printers has been decreasing. From 6 pl to 2 pl, the obvious change brought by the tiny ink drop technology is to enhance the detail performance of the printer output photo, improve the fineness of the image and reduce the graininess. However, the reduction of ink droplets naturally leads to a reduction in printing speed. For this reason, various manufacturers have taken certain measures to ensure that the printing quality is improved without lowering the printing speed.
In addition, while implementing tiny ink droplets, manufacturers have begun to pay attention to improving the shape of ink droplets in the product to make it more regular. For example, Canon uses star nozzles in some products, while some Epson products use round nozzles.
Intelligent ink drop conversion technology
Epson's Variable-Sizedroplet Technology analyzes the color composition of each area of the image, and adjusts the size of the signal driving the piezoelectric crystal to generate ink droplets of different sizes, which can be ejected in one print stroke. Medium and small ink droplets, let them perform their own functions, form a variety of output combinations, make the color of the printed image soft and natural, and the dark area will not become rough due to large ink droplet printing, because the printer will Part of the small ink droplets and light ink droplets are added to the dark areas where the large ink droplets are printed. Since the minimum ink droplet volume reaches 2 pl and the ink used is only 1/4 of the normal ink concentration, each ink droplet ejected onto the medium has only 1 pl of ink dots, and the output level is more distinct, not only in Improve the quality of the output while taking into account the speed of the output.
Drop adjustment technology
The new printhead is designed with two heaters, one that ejects a small droplet of ink or two heaters that eject a droplet of normal droplet size. Ejecting ink droplets of different sizes on one printing line, so that the printer can reduce the ink overlap when composing graphics and text when printing, so as to improve the sharpness of printing under a certain resolution, resulting in more detailed and contrast. High image. Although this technology does not enhance the overall resolution, it can reduce the graininess of the color and improve the output quality of the photo image.
Fine photo printing technology
PrecisionPhoto Precision Photo Technology was developed for Lexmark. The color ink cartridge with PrecisionPhoto fine photo printing technology uses "double nozzle" technology, that is, a nozzle that ejects 10 pl ink droplets and another nozzle that ejects 3 pl ink droplets, so that the print column (printing area) is extended longer than before, and the resolution is raised to 4800dpi × 1200dpi, smaller droplet sizes can show sharper images and sharper details and more information. In the image showing the color transition, no streaks and jumps are visible. To coordinate the relationship between print quality and speed, PrecisionPhoto technology allows the printer driver to automatically select the most appropriate dot size based on each area of the printed document to achieve the best print quality in the shortest possible print time.