![<?echo $_SERVER['SERVER_NAME'];?>](/template/twentyseventeen/skin/images/header.jpg)
With the increasing demand for coated paper prints in the printing market, modern printing processes have placed higher demands on the types of coated papers and various performance indicators. Therefore, familiarity with a variety of coated papers and their performance on the quality of printed matter has become a must before the purchase of coated paper.
a wide variety of coated paper
1. Single-sided coated paper / cardboard
The paper is coated with a single side and then calendered. The surface is smooth and bright, the whiteness is very good, the ink absorption is fast, the ink color reflection is high, the calendered side can be used for fine color printing; the uncoated side can be printed in monochrome or color.
2. Double-sided coated paper / cardboard
The paper is made by double-sided coating calendering. The surface is smooth and bright, the whiteness is very good, the ink absorption is fast, the ink color reflection is high, and the two sides of the coating calender can be used for delicate color printing.
3. Single-sided matt coated paper / cardboard
High-grade printing coated paper made from a single side of a paper by special surface coating and pressure-mixing. The surface of the paper is white and powdery, quite smooth and smooth, not reflective, and the ink is calm and elegant after printing.
4. Double-sided matt coated paper / cardboard
High-grade printing coated paper made by double-sided coating on a double-sided surface. The surface of the paper is white and powdery, quite smooth and smooth, not reflective, and the ink is calm and elegant after printing.
5. Micron paper
A coated paper made of a special type of double-adhesive paper, coated on both sides, and super-calendered. Its market position is economical coated paper.
6. Mirror coated paper / cardboard (cellophane / cardboard)
The paper is coated on one side and then calendered by a cast steel roll. The effect is as high-quality special coated paper with a glossy and smooth surface. The paper base is strong, the paper surface is white, and the gloss is bright. It is especially suitable for the high-color picture with fine dots. Paper stiffness is better than that of premium coated paper and is slightly waterproof.
7. Wet strong coated paper
The paper is specially treated (adding a wet strength agent, etc.) during the papermaking process of the base paper. After the base paper is immersed in water for 1 hour, it can maintain a dry strength of more than 15%. After the paper is coated on one side or both sides, the paper is pressed. Light can be made into wet strong coated paper. This type of paper is especially suitable for printing on maps, charts, etc.
8. Micro coated coated paper
A product between coated paper and light coated paper that is currently widely used in Europe. Its whiteness is close to coated paper, and it is easy to read after being printed on a matt surface because it is not reflective. There is a strong contrast between the printed and non-printed paper surfaces, suitable for processing, non-foaming, easy folding, easy to punch holes or broken lines, and the price is more competitive than coated paper.
Effect of coated paper properties on print quality
Paper is one of the five major elements in the printing process (print plate, ink, fountain solution, printing material, printing machine). The quality of coated paper directly affects the speed of printing and the quality of printed matter. It can also be said that coated paper Performance determines whether the printing process can go smoothly and whether high quality prints can be obtained.
1. Surface strength of coated paper
The surface strength of coated paper refers to the bond strength between the coating particles on the surface of the coated paper and between the coating and the base paper. It is an important performance index of coated paper, usually expressed by the pulling speed. When the surface strength of the coated paper is low, it is easy to cause hair loss and powder falling during the printing process. As the printing progresses, more and more paper and paper powder will accumulate on the printing plate, which will eventually lead to paste printing and affect the printing quality and printing operation. Therefore, it is necessary to improve the surface strength of the coated paper to ensure a good printing effect.
2. Moisture and temperature resistance of coated paper
The moisture of the coated paper refers to the weight of the moisture contained in the coated paper as a percentage of the weight of the coated paper. With the development and progress of society, the printing industry has also developed by leaps and bounds. The emergence of commercial rotary presses has placed new demands on the temperature and moisture content of printing coated paper. If the moisture is not good and the temperature resistance is poor, the bubbling phenomenon of the coated paper in printing may become a more serious and more common problem in the rotary printing.
Due to the high-speed printing characteristics of the rotary printing press, it is generally 40,000 to 50,000 sheets per hour (the average printing speed of a single sheet of paper is less than 20,000 sheets per hour), and the direct folding is performed after the printing is dried. At such a high speed, in order to prevent the printing abnormality such as ink drying and back surface sticking, the printing ink needs to be dried quickly, and the most effective method for quickly drying the ink is high temperature heating, so in the structure of the rotary printing machine. There is an oven that heats the printed coated paper to allow the ink to dry quickly.
The quantitative moisture in the coated paper is released into the water vapor at the high temperature drying (drying temperature is generally around 140 ° C), because the coated paper has a coating layer on one or both sides, and the coating is adhered due to the coating. The role of the agent and its cross-linking agent, although avoiding the phenomenon of hair loss and powder falling during the printing process, is unfavorable for the outward release of water vapor during the drying process of the printing ink; if it is in the same position on both sides of the paper, it is exactly the full version. When printing, and the amount of ink is large, bubbling occurs due to the ink completely covering the paper surface, which further causes the water vapor to be released out.
In order to avoid blistering during printing, the following three points should be noted when selecting and using coated paper:
(1) Select coated paper with good temperature resistance.
(2) Select coated paper with a water content between 6% and 8%. If the water content of the coated paper is too high, the water vapor in the printed matter with the coating and the ink cannot be quickly released outward in a short time, thereby causing bubbling; if the water content is too low, the paper is liable to generate static electricity, and tends to It is brittle and hard, which is not conducive to printing; if the water content is not uniform, it will form tight edges, ruffles, curls, etc.
(3) The temperature of the coated paper printing workshop is controlled at 18 to 25 ° C, and the relative humidity is maintained at 50% to 60%.
Timber Dining Chairs,4 Seater Dining Set,2 Chair Table Set,Overstock Dining Room Sets
Foshan Chengda Furniture Co.,ltd , https://www.catalogfur.com