Little Knowledge 丨 Textile Stacking Printing Technology Analysis
1. Color subtractive method:
The two colors overlap each other, and the overlapping portion subtracts the respective absorbed color light after mixing, so that the light energy reflected or transmitted by the mixed color is lowered, and an alternative color is formed, and the color becomes dark.
2. Three elements of color:
The main significance of hue, lightness, and purity is to use a small amount of hue to form more hue; brightness: the degree of color, the brightness of the dye after the color drop, printing paint cover printing due to the presence of titanium dioxide, and the background color After the overlap, the lightness increases, and the significance of the lightness in the overlay printing is to enhance the layering of the printing; the purity: the saturation of the color, the higher the purity, the brighter the color, the more the color overlay, the lower the purity, and the overlapping color printing The determination of color purity should be conducive to the vividness of the picture.
3. The arrangement and use of primary colors of printed overlays:
Theoretically speaking, magenta, cyan, and yellow are the three primary colors of dyes. They are the basis for all dyestuffs. Most of the dyestuffs and coatings commonly used in actual printing do not have the three primary colors in the strict sense, and usually have similar red, yellow and blue colors, but their stacked colors. The range of colors produced is less than that of magenta, yellow and cyan, and the brightness of paint shades is better than that of activity and dispersion.
Inter-color: Two dyes that are close to the primary color shade are mixed, called secondary colors such as orange, green, and purple; in stacked-print printing, when the dark color is printed first, it penetrates into the fabric and is equal to the color The color light tends to be dark, and if it is light-colored, the same amount of overprinting light tends to light-colored;
Duplex: The color containing the three primary dyes is called the complex color, which is the tertiary color. The three primary colors are mixed in equal amounts to obtain the grayish black with the minimum brightness. When the color is not equal, different complex colors can be obtained, and the color shades tend to have a large proportion of primary colors. The coffee, dark green, earth red and all kinds of gray in the color printing are laminated one at a time;
4. The color printing method of the overlay printing is three methods: solid color overprinting, dot overprinting, solid color, and dot overprinting;
There are paint, activity, dispersion, it shows the law of color subtractive method, while the hiding power of the paint is higher than the active dispersion, the shade of light is more emphasis on the post-printing, and the active dispersion is the first printing of the easy-infiltrated fabric, and the post-printing of the accumulated fabric surface. , Easy to wash off when soaping, so emphasis on the first printing paste; Cover printing paste containing titanium dioxide, there is cover, can only be overprinting network, the color is the color point juxtaposed color, the tendency of shade depends The ratio of dot color to background color. Reactive, disperse, and dot overprint of the coating are the dual results of color penetration and coloration. Solid color overprinting: The color block presses the color block, and the background color generates a third color through the overlapping color.
Overprinting: Overprinting of moire, flat dot overprinting, moiré and flat meshes with overprinting; Overprinting of moiré: Overprinting of overprints of the same color: The overtones of the shades of color are mainly used to express the level of overexpression. The style of performance is more than a moire. Rich and thick layers; overprinting of moiré with different colors is the main content of moire. This method is used in printing to realize the polychromatic effect of overprinting, and the color is more abundant;
Flat dot overprint: a uniform dot overprint, such as a 30% uniform dot printed in red, seen on the bleached fabric is light red, and then embossed dot 30% of the yellow uniform dot, see is light orange, By analogy, other flat screen dots are overprinted on each other, which can discard more third colors, but the fabric is not as clear and colorful as paper.
5. Overprinting of solid colors and dots:
Most of active, disperse, coating moire and solid overprints press light-colored patches on dark moiré, and cover printing paste can print lighter moiré on deeper backgrounds. India's level and color change.
6 color printing color separation screening:
Solid color overprint: the coloring area is larger than the coloring area of ​​the shrinkage of 1 to 2 lines; fine cloth shrinks 1 to 2 lines than the coarse cloth; the same pattern, activity, dispersion relative coating shrinks 1 to 2 lines, because the paint spread is less than the previous two Overprinting: Overprinting: Overprinting of moiré depends on the selection and control of separation and screening; moire printing is divided into two types: regular and irregular, dot shape, screen angle, screen grayscale, and screen cable Number is the basic element of regular screening. The shape of dots is preferably a dot, the number of screen meshes is high, the number of screens can be high, and the coating is relatively low.
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