Printed knowledge summary 10F
Third, light box advertising pattern production process
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The color of the light box pattern printing is better than the graphics and the presentation in the visual communication. Whether each element can truly reproduce the intention of the advertising designer and play the best effect in visual communication, it must be purchased through various printing methods. The color pattern reproduction principle of the light box is based on gradation reproduction. In order to meet the requirements of the printing process, the screen images, photographic screens, or electronic color screens are used to decompose images of successively tuned originals into dots similar to a mosaic shape. The human eye cannot distinguish between different density levels at the observation distance. The image pixel network points achieve a continuous tone visual effect on the viewing distance.
Regardless of which printing process is used, the level and clarity of the original should be reproduced as efficiently and effectively as possible on the printed matter. Select the original to consider: five factors: color, tone value, structure, color saturation, and morphology.
The key to color tone reproduction is color separation screening, which is based on the surface properties of the substrate (smoothness, roughness, texture, and absorbency); the size and viewing distance of the printed material; The scope of contrast and the role of subtle layers; printing ink (particle size, viscosity, drying characteristics of pigment); color intensity and light resistance; printing speed
1. Determine the number of color separation screens:
People are not distorted when viewed from a distance away from print, etc., but they can achieve subtle levels of reproduction, and hue and saturation are in the normal range. This should fully consider the relationship between the screen and the viewing distance (see Table 3).
table 3
Print format Viewing distance Add screen/cm
A5 0.5m or less 36 to 48
A4 0.5 or less 24 to 36
A3 0.5 to 1m 18 to 24
A2 1～3m 15～20
A1 2～5m 12～18
A0 3～10m 12～15
Larger size 3～20m 6～12
2. The choice of screening angle:
Choosing a good screening angle is an important part of reducing the appearance of moire. When color copying, different color separations must use different screening angles in order to suppress moiré as much as possible. For this reason, the difference between screen angles is 30° for eye-catching colors (cyan, magenta, black). The yellow version is an unobtrusive color and can be written in 15° other colors.
3. Color inkjet printing technology applications:
Inkjet printing is a non-pressure printing method that uses computer control to obtain fine prints of ink from a nozzle onto a substrate to obtain text and images. It integrates electronics, mechanics, fluids, ultrasound, and computer technology into one, and has become one of the high-tech technologies in the field of color printing. Due to the use of ink jet printing technology in outdoor large-scale advertisements in recent years, the color tone levels, sharpness, and color saturation of advertisement patterns have reached near-perfect level.
(1) Inkjet printing composition system:
Inkjet printing systems consist of system controllers, inkjet controllers, printheads, substrate drive mechanisms, substrates, and more.
The output ink dot of the inkjet printing system is a key factor in determining the printing quality. The size of ink dots is expressed in dots per inch. Color screen printing is generally 300dpi, 600dpi, 720dpi, 1024dpi, etc. Some large-format advertising poster printing can meet the requirements with 9-72dpi.
(2) Types of ink jet printers:
Inkjet printers can be classified into continuous inkjet printers and intermittent inkjet printers (see Figure 1).
(3) Color inkjet printing:
The host of the color ink jet printing system receives color information through a variety of different information sources, such as color graphic terminals, color scanners, digital cameras, color word processors, and various analog or digital document collection systems. The information source sends the three primary colors of spring light to the printer interface, and stores the information to be copied into the main memory. Then the color converter converts the red, green, and blue color information to blue and magenta. The color separation and screening signals of the four-color inks of yellow, black and black are controlled by a gray controller and the ink signals of the above four colors are respectively sent to the electrodes of the corresponding color nozzles to control the ink jets of the nozzles.
(4) Inkjet printing materials:
a. Coloring material:
High-grade special inks for yellow (Y), magenta (M), cyan (C), and black (K) inks for color inkjets. The printing performance must be stable, non-toxic, non-blocking, and has good jetting properties. , such as a liquid ink performance indicators.
At present, a wax-based solid ink is widely used. Its coloring material is a pigment, which has excellent light resistance and is not easy to fade. The printing process is fixed on the surface of the substrate, does not penetrate into the interior of the substrate, and the print has good clarity.
b. Printing materials:
The types of printing materials that can be used are special paper, inkjet film and light box cloth. In terms of paper, in order to prevent ink dots from spreading on the paper, the surface of the paper is required to be smooth. High-gloss photographic paper is generally used, and its surface is coated with a very thin transparent coating.
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