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Digital printing fabric of some problems in (on) - screen printing industry, especially web by srf thrh

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Digital printing fabric of some problems in (on) - screen printing industry, especially web by
Article Posted: 01/26/2011
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Digital printing fabric of some problems in (on) - screen printing industry, especially web

Business,Business News,Business Opportunities
I. Introduction Six years ago, Zhejiang Jiang Honghua Computer Technology Company has begun production of fabric dyes for six-color digital printing machine, Shanghai Hua Lun printing company has used it hundreds of sets of patterns produced. Mercerized cotton bleaching process used rolling base (soda ash 10% 2% + urea + sodium alginate + resist salt S amount) drying reactive ink jet printing steam (102 , 8 minutes) water washing soaping, printing effects and color fastness to basically meet the requirements.

  Time, with a water-soluble dyes for coloring agent, color fastness of the printed fabrics easier to reach the requirements. Cotton, polyester, silk, wool, nylon, acrylic can be used for the corresponding dye ink. However, color density, dye uptake and fixation rate does not match the other reasons, the blending of hues and shades to totally break like this in the activity, dispersion, acid dye ink-jet printing in common. The paint was a problem printing is: less concentrated dark, light-colored, less brilliant, less printing resolution, easy plug nozzle.

Five years, textile digital printing technology have greatly developed, but for the scale of production, a number of technology still needs further improvement. Get the information is summarized from the analysis, explore the following questions for your reference correction.

Second, with regard to digital printing methods Digital printing include 'read' and 'write' two elements: the first 'literacy' is the digital camera or scanner to read the optical radiation signal, decomposed into XYZ tristimulus values, modulated into a digital write RAM memory . The second time 'to read and write' is read the RAM in your computer's digital information, through the printer, copy, stood out. Second reading and writing errors have occurred factors: the former is as a digital light modulation due to different incident light and illumination, the photo image in the hue and brightness all have different terms; the latter reduced to a digital color hue with , as 'Three basic color' is not standard, the concentration does not match the hue differences arise.

In theory, red, yellow and blue color shade ternary mixed, can be 'white', red, yellow and blue color pigment mixed ternary can be 'black' color. Addition of light colors are mixed, red, yellow, blue, plus white can spell out a variety of shade and brightness, like seen on TV screen. Subtractive color mixture is mixed with red, yellow, blue plus black, various colors can be retrieved. CIE RGB wavelengths of light are: Red 700.0; Green 546.1; Blue 435.8, if the red, green, and blue color more than three primary colors reflected wavelength of light was in line with requirements, you can call up different proportions of various colors. However, such a pure shade of paint does not actually exist, but only contained nothing more or less variegated. Thus, subtraction subtractive complementary colors mixed with each other, it will surely into the third color component, to further reduce the brightness and color. This pigment mixture can not use red, yellow, blue triple-color, and take magenta (red violet), yellow, blue (blue-green), or red, green, and blue as the 'Three basic color' in order to improve purple green and red brightness. Because these two people's vision of the bright hue or not, more sensitive.

Three-color inkjet printer (magenta, yellow, green), four-color (three colors plus black), six-color (four-color plus TANSEI, and light magenta), seven colors (six colors plus black light) etc. [6]. 6-8 for fabric dyes printing inks, in addition to four color, there are used green, red, blue, orange, and the company's basic color inks with the same. No matter what color of dye, because of their color impurity, the second copy to read and write out the images can not be exactly the same hue and stood.

Printing methods are: pin, inkjet, laser and other printers. Textile digital printing, inkjet printing technology now used. There are three forms of inkjet nozzles, nozzle diameter, mostly in the 10-100 m range, they have used for textile printing. Figure 1:

Figure 1 Schematic diagram of ink jet printing with the important parameters of three nozzles Figure Note: * ImajeS4CIJ printing machine nozzle diameter of 50 m. ** Split flow to generate the oscillator drops of ink per second, 62,500; forward speed of 18-20m / s *** print resolution up to 1440dpi.

'Continuous' is equivalent to 2 atmospheres pressure water gun, continuous injection, power drops to a sense of change, or fired or fired fabric collection trough, the advantage of print speed and finesse drawback is poor; 'Bubble (BubbleJet-BJ)', or thermal spray: as gas guns, drop on demand infusion chamber, the nozzle component transient thermal heating to 350 , the ink composition of low boiling point evaporates quickly, resulting in an explosive pressure, the liquid drops ejected, the advantage of high definition, the direction of disadvantage is scattered jet nozzle easily be blocked; piezoelectric: As pump water cylinder, piezoelectric ceramics by pulsed electric current to cause deformation, rapid spray of ink out of some different models can also control the pressure to change the droplet size, print high precision. Advantages are: inkjet does not require heating, so the ink will not undergo chemical changes, nozzle clogging the disadvantage of high cost of sprinklers. Previously the most widely used office desktop inkjet printers, Canon (Canon) and Hewlett-Packard (HP) using the bubble-type companies, Epson (EPSON) company uses piezoelectric. Now Canon has also added a piezoelectric.

In print speed, continuous injection period of 62 500 drops / sec, the printing speed is 300 m / min. Record rate of 2000 symbols / sec, 48,000 copies per hour printed newspaper, its efficiency of 10 times higher than other printing methods. The other two current high-end inkjet-style printer, can emit ultra-fine ink droplets 2 pico-liter (diameter less than a fraction of 1 / 10). Frequency of 5000 per second can be described as: Seiko secret agents.

Office printing paper, general printing paper with a matt; photo printing, with thick glossy photo paper coating; high-gloss paper, ink capacity, the proliferation of small dots, the printing clear and sharp pictures, shadow density, crystal opacity, very realistic. Inkjet fabric printing is hard and the degree of clarity and nuanced paper, especially the quality of photos printed with pictorial comparison.

Recent years, the development of long, speak out of turn, a large ink jet fabric printing machines, production capacity has 0.1m/min elevated to 2m/min. Piezoelectric nozzle, accounted for 80% of market applications [5], coating ink jet printing is on the rise, there are many units producing pigment ink. However, the actual situation does paint a nuanced degree of ink-jet printing, clarity, color fastness, but also be further improved. Overall, the focus of the development of inkjet printing technology paint three: 1, election

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