Treatment method for fading and discoloration of printed products      In the packaging and printing industry, there are various types of paper products. Under the irradiation of sunlight, sunlight, incandescent lamps and other light sources, printed products such as books, picture albums, newspapers, advertising recruitment pictures and New Year pictures can show bright and colorful colors through the selective absorption and reflection of ink materials.Treatment method for fading and discoloration of printed products.     The fading and discoloration of printed matter are caused by many factors, such as light resistance of ink, acid-base of paper, temperature, printing color sequence and so on.Treatment method for fading and discoloration of printed products. 1. Discoloration during ink drying.     In the process of printing, the ink color of the newly printed ink is compared with that of the dried ink. The ink color of the newly printed ink is relatively deep. After a peri […]

Operation method of plane color screen printing       In the packaging and printing industry, a variety of flat color screen printing are often needed. Today, China paper network editor found the relevant content and introduced the operation skills in detail.Operation method of plane color screen printing.      1. Selection of plate making film.      In order to obtain screen prints with rich levels, first make films like offset plates, and select the website output of 100-133 lines / inch. Too high number of lines is not conducive to the reproduction of medium and low-key levels. When selecting the circular website, the copy curve of the screen printing website is reduced below 20%, and 70% of the website becomes larger.      The step curve of the image must be adjusted before publishing. The network angles of general films are magenta version 15 °, green version 75 °, yellow version 90 ° and black version 45 °. Practice has proved that moire rarely occurs.      In addition, in order […]

Problems needing attention in screen drying         In the packaging and printing industry, screen printing operators know that a clean and tidy environment is very important for plate making. A clean and tidy environment can prevent many quality problems. Problems needing attention in screen drying.      Because the dust and oil stains in the environment adhere to the surface of the photosensitive adhesive layer, they will form pinholes on the screen, affect the printing quality, and then lead to the decline of production and quality.Problems needing attention in screen drying.       Relatively speaking, the cleanliness of the oven is also very important, but this is often ignored. While expanding the scope of consumption, some small and medium-sized enterprises also change the drying equipment from hair dryer to oven.Problems needing attention in screen drying.       However, due to the lack of effective management, they will put warm cloth and some sund […]