1. What is four-color printing? Four color printing process generally refers to the printing process that uses yellow, magenta, green three primary color inks and black ink to copy color originals. 2. What is spot color printing? Spot color printing refers to the use of yellow, magenta and cyan. A printing process in which the original color is reproduced by ink of other colors other than black ink and four-color ink. Spot color printing process is often used to print large area background color in packaging printing. 3. What products must be printed in four colors? In order to meet the requirements of technology or economic benefits, it is necessary to scan and separate colors by electronic color sorter or color desktop system, and then copy them by four-color printing process. 4. What kind of products will be used for spot color printing? The cover of packaging products or books and periodicals is often composed of uniform color blocks of different colors or regular gradual color blocks and text. These color blocks and characters can be overprinted with four primary color ink after color separation, or spot color ink can be prepared, and then only one kind of spot color ink can be printed at the same color block. In order to improve the printing quality and save the times of overprint, spot color printing is sometimes used. 5. What's the difference between spot color block and four color block? The ink prepared by spot color printing is obtained according to the mixing principle of pigment subtraction method, and its color lightness is low and saturation is high: spot color block with uniform ink color is usually printed on the spot, and the ink amount should be appropriately increased. When the thickness of ink layer is large, the sensitivity of the change of ink layer thickness to color change will be reduced, so it is easier to get uniform and thick ink color The printing effect.The color block produced by four-color printing process is composed of a certain proportion of dot. When printing dot, the thickness of ink layer must be strictly controlled, which is easy to change the color intensity due to the change of ink layer thickness and printing process conditions. The change of dot enlargement, resulting in color change. Moreover, any color change of the color block will lead to the color change of the color block, and the chance of uneven ink color will be doubled. Therefore, it is not easy to achieve uniform ink color effect by using four color printing process. If the color of the color block can not be printed by multi-color machine at one time, color deviation may occur due to the color of semi-finished product is not easy to control. In addition, four-color printing obtains the comprehensive effect of dot subtraction absorption and color addition, with high brightness and low saturation. For the light color block, using four color printing process, because of the low coverage of ink on the paper, the ink color is flat and lack of thick feeling. Because of the angle of the dot, people will inevitably feel the existence of the pattern. 6. From the point of view of improving product quality, what kind of product is suitable for spot color printing? When printing large area of light color uniform color block, it is usually used to add medium light agent in the original ink to prepare spot color ink, and then carry out field printing, so that the ink layer is thicker, and it is easier to get uniform color and thick effect. If four color printing process is used, a low percentage of flat screen dot must be used. However, the low percentage of flat screen dot is easy to be caused by small sand particles or poor air suction, resulting in uneven ink color and excessive water supply. The paper powder is piled up on the plate and blanket, and the low smoothness of the paper results in the poor ink transfer of small dots. As a result, the ink color becomes lighter and the ink color is uneven. For the large area of dark color block, four color printing process may need to be composed of several colors of high salty number of dots, the ink layer is too thick, easy to appear back rub dirty; while using spot color printing process, only one color is needed to print, so the back is not easy to get dirty. Using four color printing process, some parts of the picture and text may be composed of several colors, while using spot color printing technology, the corresponding parts only print one color, avoiding the possibility of overprint error. 7. From the perspective of economic benefits, what kind of products are suitable for spot color printing? From the perspective of economic benefits, it mainly depends on whether the use of spot color printing technology can save the times of overprint. Because reducing the number of overprint can save both printing costs and prepress production costs. 8. Can a product use four-color printing and spot color printing at the same time? If the picture of a product has both color level picture and large area background color, four color printing can be used for color level picture part, and spot color printing can be used for large area background color. The advantage of this is that the screen can be restored correctly by controlling the field density of the four-color printing part, and the visual effect of uniform and thick ink color can be obtained by appropriately increasing the ink amount in the background color part. This method is often used in the printing production of high-grade packaging products and stamps, but the cost of plate making increases due to the increase of color number. 9. When using the four-color printing process, if there is a large area of black field, how to make the plate more conducive to the black field ink thickness? When using the four-color printing process, in order to ensure the correct restoration of the tone and color, the ink layer thickness of each color should be strictly controlled. Generally, in four-color printing, the density of black field is less than 1.8. If the density is used to print a large area of black field, it will lack of thick visual effect. The commonly used force method is to overprint about 40% cyan in large area black field. Black field overprint a small amount of cyan, from the hue point of view or black, the visual effect will be more thick. Originally, only one color of black was printed on white paper because of the paper wool in the printing process. Paper powder on the blanket accumulation, or due to other reasons affect the transfer of ink, will make the black field appear white sand hole, black and white contrast is very conspicuous. If the cyan flat screen is overprinted, even if there are a few sand holes on the black field, because the exposed is no longer the white paper base, but the cyan dot, compared with the black-and-white contrast, the black-green contrast is not so obvious, which can make the black background look more uniform and beautiful.
Dongguan Beite packaging materials Co., Ltd. - located in Dongguan City, the world's manufacturing city, is a subsidiary of Beite packaging (China) Co., Ltd., with a plant area of 6000 square meters. It is a flexible packaging enterprise integrating R & D, production and sales. It has a complete set of domestic advanced production equipment, a scientific and humanized management system and a group of experienced technical personnel For backing, to provide customers with quality products and first-class service.
The company produces composite bags, roll film, fruit bags, aluminum foil bags, suction mouth bags, self-supporting bags, zipper bags, anti-static bags, special-shaped bags, etc., which are suitable for the internal and external packaging of food, daily chemicals, electronics, toys, medicine, cosmetics, industrial products and other industries.
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