Pre-press technology case solution (10)

Film common sense

The film is black. The film's corner usually has an English symbol. It is the film number of the film. It indicates which of C, M, Y, and K is the film. It is one of the cmyk (or spot color). , which means the film is what color output, if not, you can see the angle of the hanging net to identify what color. The next stair-like strips are used for dot-density calibration. In addition to seeing whether the dot density is normal or not, one is to see CMYK, the color bar is C in the lower left corner, the color bar is M in the upper left corner, Y is in the upper right corner, and K is in the lower right corner, so long as the color printing factory You know CMYK. That is to say, in order to facilitate the detection of the film developing concentration, the film sheet has a color number on the corner. The number of colors printed depends on the screen of each film. The film outlet on the film is to tell you that "here there is a certain degree of color." For example, the general text version is only black, and there is only one film in the print. If you print in red ink, the printed word is red. A film film represents only one color, printing color, at least four film films, representing C, M, Y, K 4 colors! Can also be four spot colors, spot color film is a separate file output into K version. Next to the color code can not show the specific value of CMYK, but used in comparison, to check whether the film meets the requirements. Some people are accustomed to drawing corner lines (cutting lines, register lines), and then using their own solid colors to mark the names of each version. For example, marked with C, M, Y, K, special silver, and then fill in the blue, red, yellow, black and spot colors on the spot color, so that the film came out on the label and is particularly intuitive. The size of the color standard is 10*5mm, and the English letters of the paper-colored CMYK are printed, and the color blocks correspond to the names of the colors. The printing workers can see the edges of the film. In general, the film's dot is fixed, just like the yellow version's screen angle is 90 degrees. There are exceptions, if the yellow expression of the image is concentrated in the range of 90 degrees, then the yellow can not use the 90 corner. Otherwise, the trace of the hanging net is too obvious!! As a general rule, out of a color, you should hit a color bar , In turn, to check that in the process of coloring non-forest, the drying process on each density step is very clear, usually four color bars, and the arrangement is very neat. Most colors are based on the combination of these four colors, then each film is black, but they are different colors C, M, Y, K, see the proportion know, and then by printing four-color ink.

Outdoor light box advertising features and production techniques

The pattern is an important "visual communication element" of print advertising, and color is superior to other elements in visual communication. With the rapid development of electronic platemaking and printing machinery, advertisements are springing up. Advertising for outdoor light boxes as semi-permanent print ads, thanks to the use of auxiliary light and transparencies, makes it possible both during the day and at night. Can play the following role: to attract the attention of passers-by; enhance the realism of the article; rendering product breath, to induce consumers' desire to purchase; strengthen the special impression of advertising.

In the design and production of outdoor light box advertising screens, in order to recover the sense of reality and artistry, color printing or photo printing is often used; light boxes are also produced on the special paper, plastic sheet (film), and light box cloth by means of screen printing. Screens, and selection of manufacturing methods and materials based on their cost of replication, weatherability, and other requirements. This article discusses the application of its production technology on the characteristics of the light box advertisement, the main constituent materials and the pattern production process.

First, the characteristics and types of outdoor light box advertising

Lightbox advertisements are also known as "light box posters" or "night-night posters." It is called "semi-permanent" street art abroad. Outdoor lightbox advertising is distinguished from other types of advertising. Its characteristics are as follows:

1. Large screen:
A large number of print advertising media are used for indoor or small-scale communication with a small format, while outdoor light box advertisements display advertising content through door headings, bulletin boards, and pole light box paintings. Compared with other graphic advertisements, the illustrations are large and the fonts are large and striking.

2. Farsightedness:
The function of the outdoor light box advertisement is to convey information to outdoor people and distant people through natural light (daytime) and auxiliary light (night). The advertising works have strong far-sighted effects, and people who are right in the fast pace, high efficiency, and hurry of modern society pay attention to them at a distance.

3. Wide content:
In public transportation, transport, security, welfare, savings, insurance, taxation, etc.; in commercial products, businesses, tourism, services, etc.; in culture, education, art, etc. Play a role.

4. Concurrent:
There are many forms of display, with both text and color features, from product trademarks, product names, physical photos, colors, business intentions to culture, economy, customs, beliefs, and norms. Through ideas and unique ideas, we will firmly grasp the "ring" of inducing consumers' desire for purchase, and achieve the purpose of advertising through the heterogeneity of visual communication.

5. Fixed and complex:
No matter what kind of form the outdoor light box advertisement adopts, it has its fixed requirements in a certain range and position. As a permanent display device as Feng, its basic structure is more complex than other forms of advertising. Including frames, cladding materials, pattern printing layers, windbreaks, rain and snow structures, and lighting facilities at night as lighting make copying costs higher than other advertisements in one piece.

There are many types of outdoor lightbox advertisements. At present, there is no clear way to classify the types of lightboxes. But from the scope of application and into the movie, clothing advertising (poster light box painting); alcohol advertising (light box painting, selling point display card): Banking, insurance advertising (door, pillar light box painting); electrical advertising (selling point Display boards, floor-standing light boxes); subway stations, bus booths, etc.

Second, outdoor light box advertising composition

1. Frame and mask:
The main components of the large light box are steel and plastic structures. The double frame of the base is welded with steel or stainless steel. The pattern cover is made of glass Plate, organic glass plate, and light box cloth. The main components of the small-sized door, rod, and hanging light boxes are injection molding frames, and the pattern covers are mostly made of glass, plexiglass, or transparent plastic plates.

2. Pattern printing carrier:
Lightbox print carrier according to its structure and production process, can use synthetic paper, inkjet film, self-adhesive adhesive film, light box canvas and other materials.

3. Auxiliary light facilities:
The auxiliary light of the light box (commonly known as lighting) is based on the structure of the pattern screen, the printing material, the thickness of the printing ink layer, and the pattern width. In the past, common fluorescent lamps were used. With the application of new lamps and lanterns, the auxiliary light of the light box has also evolved from a single lighting to various types of lighting. The resulting picture quality, uniformity and softness have been greatly improved.

Third, the light box advertising pattern production process light box pattern printing color in visual communication is better than graphics and documents, whether the elements can truly reproduce the intention of the advertising designer, play the best effect of visual communication, it is necessary to pass a variety of printing Way to buy now. 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 manuscript should be reproduced as efficiently 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 distances away from prints, but can also be reproduced in subtle levels with hue and saturation in the normal range. This should fully consider the relationship between the screen and the viewing distance (see Table 3).
table 3
Printed web inspection distance screening number/cm
A5 below 0.5m 36 to 48
A4 0.5 or less 24-36
A3 0.5 to 1m 18 to 24
A2 1～3m 15～20
A1 2～5m 12～18
A0 3～10m 12～15
More large-scale 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. In color reproduction, 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 take fine ink flow from a nozzle onto a substrate to obtain text and images. It integrates electronics, machinery, fluids, ultrasound, microcomputer and other multi-disciplinary technologies and has become one of the high-tech fields 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 a near-perfect level.

(1) Inkjet printing composition system:
Inkjet printing system consists of system controller, inkjet controller, nozzle, substrate drive mechanism, substrate and other components.

The output ink dot of the inkjet printing system is a key factor in determining the print 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 two categories, continuous inkjet printers and intermittent inkjet printers (see Figure 1).

(3) Color inkjet printing:
The main body 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 color red, green, and blue information 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 (see Table 5).
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 and does not penetrate into the interior of the substrate. The print has a good definition.

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.

4. Color screen printing technology application:
Screen printing is an ancient and unique printing technology. The author once described the application of screen printing technology in the title of “Application of Any Light Box Advertising in Color Silk Screen Technology” in the issue of “China Printing” magazine, Issue 10 of 2001. Screen printing has the advantages that other printing methods do not have, and the application of various types of outdoor advertising occupies a considerable proportion of energy.