Color change, that is to change the ink color of a certain unit, or convert the ordinary base color ink to spot color ink. Nowadays, it is very common to use spot color ink for printing. Sometimes a shift needs to change the spot color four or five times. It is really troublesome to wash the car frequently, especially when the quality of COTS is poor and the ink color of spot color ink is light. Sometimes car washing and color changing can't be repeated several times, which makes the production unable to proceed normally. Therefore, the work of color change can not be ignored, but also pay attention to some skills, so as to make spot color printing no longer troublesome. Through many years of practical experience, summed up the following points: (1) first of all, we should learn about the theory of light and color, master the principle of color subtraction and the basic law of ink color change. It is necessary to be able to connect with the actual production, repeatedly ponder and flexibly use. (2) After receiving a spot color printing piece, the group of spot color should be roughly analyzed. Which primary color ink should be prepared? What is the approximate proportion? For example, orange is generally more yellow ink than red ink, snow blue color is generally more red ink than blue ink, coffee color is generally half yellow and red ink, plus some black ink, light spot color also has a lot of diluents. (3) Select the color group similar to the spot color to be printed to wash the car and change color. Now four color machine is more common, the flexibility of choosing Blue Group is bigger. Once the wrong color group is selected, it must be hard to please. For example, orange ink must not choose the blue group, but the yellow or red group, because even if only a little blue ink remains in the orange color, the color will become gray; silver ink must not choose the red group, but the black group, so that it is easier to change color, even if the car wash is not very clean, it will not significantly affect The visual effect affects the product quality. (4) In the selection of good color group, ready to wash the car for color change, but also according to the color phase analysis of the spot color to be printed, precoat some other primary color ink contained in the spot color on the cot. In other words, if the spot color is golden red, then apply yellow ink to the original red group. If it is coffee color, apply yellow ink and a small amount of black ink on the red group. Then, let the machine run for a while, and then wash it off with car wash water. The advantage of this is to make the cot coated ink hue before cleaning has been roughly close to the spot color hue, basically clean it, at most two times on the same. Even if it is not clean, leaving residual ink, it will not change the color of printed matter. (5) In order to clean the cots in a short time, it is necessary to ensure the pressure between the cots, the pressure between the rubber strips of the rubber washer and the inking roller. In addition, both ends of the cots should be washed for a while. Because cots are mostly olive shaped after using for a period of time, both ends are easy to aging, resulting in cracks, spots, the original residual ink is not easy to clean, thus affecting the color of the print. Of course, when necessary, you can also use some cleaning agents, such as water, paste, etc., but the cost is slightly higher. In a word, we should rely on the accumulation of knowledge and experience, master the working methods and skills, and use effective additives reasonably. Only in this way can we save time, effort and money on the whole and get twice the result with half the effort.
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.
We uphold the integrity of cooperation, good quality, good service business philosophy, won the industry's approval, products sold to all over the world; welcome friends from all walks of life to inquire, visit our factory to investigate guidance and business negotiations.