Application and technology of the most popular wat

Application and technology of all water-based four-color ink

in recent years, textile printing using the principle of four color separation has gradually attracted attention. At present, the color patterns of tourist textile crafts and T-shirts popular in the market are all four color prints

for the md-994 all water-based four-color ink produced by Shanghai Meide Fine Chemical Co., Ltd., the existing flat printing machine manufacturers do not need to increase equipment investment at all. As long as the company's products and technical guidance (landing station) are used, his important task is to produce printing products in batches according to the established plan, and the operation procedure and production speed are the same as that of pigment printing at ordinary times

md-994 all water-based four-color dot special ink has bright colors, convenient operation and low price (only five to one seventh of the imported four-color ink). For such an excellent product, to make good use of it, that is, to produce four-color printing works that are more than 98% similar to the original, we must have an excellent four-color printing process, which is very helpful to improve the four-color printing effect of electronic color separation plates. So, how to carry out four-color dot printing

version material selection

silk: choose monofilament polyester yellow silk around the mesh. When the white silk is exposed, the light will refract and the highlight level of the pattern will be lost. The elongation of silk must be low. In order to avoid moire, it is best to choose the mesh of wire as times as the number of points and lines of the electric slice

photosensitive adhesive: choose a photosensitive adhesive with high solid content, good resolving power and bridging adhesion with silk (2) certificate number of evaluation institution: good double curing diazo photosensitive resin with national environmental assessment certificate Jia Zi No. 1801. This ensures that the highlights are not lost during exposure, and generates a high-definition, high-resolution version

plate making

electronic segmentation: submit the original to be printed to the unit holding the computer printing color separation plate making system for image scanning, layout design and production until the electronic segmentation negative is output. The line/inch is the best choice for the frequency modulation point of the electric separation negative, and the photosensitive film is on the front of the negative. The number of dots and lines in the selection of electronic film should depend on the size of the printed product and the distance between the printed matter by visual inspection. In general, advertising production pays attention to the far-reaching effect (more than 1 meter beyond the visual distance). The appropriate number of dots and lines/inch is selected, and the eye is preferred for silk. For example, for textile printing and handicraft printing, the number of dots and lines should be higher, generally 55, 60, 65, 70, 80, 100 lines

stretch: use the method of oblique stretch. Usually, the angles of various color points are used: 90 degrees for the Yellow Version, 75 degrees for the blue version, 15 degrees for the red version, and 45 degrees for the black version. If the number of wire mesh exceeds times of the number of points and lines of the electric slice, the method of straight stretching can also be used, which can prevent the headache moire phenomenon often encountered in the four-color printing. The most important rule of stretching is: the wire tension in the four printing frames should be the same. If the tension is different, the wire will stretch differently in the printing process, resulting in inaccurate overprint

coating photosensitive adhesive: first wash the four frames with washing powder or detergent, and then use a sizing device with a sharp blade after drying. The width should be close to the inside of the printing plate, and the force should be uniform. First coat the ink scraping surface once, then turn the plate upside down, and then coat the ink scraping surface once. Use the same method to coat the printing surface twice, with a film thickness of 20 microns. The sizing should not be too thick, otherwise the dots are easy to spread. After coating, place the plate horizontally and dry, dry it no more than 30 ℃, and then blow it with a fan. The working darkroom environment should be clean and dust-free

plate printing: when printing, in order to stick the underside of the negative close to the glass, it is best to choose a vacuum plate printing box, and the plate printing box uses float glass to reduce refraction, otherwise it will affect the definition and resolution of the plate. When pasting negatives, it is best to choose a revision box. First, align the regular lines of the four negatives 100%. The backer should be set in advance on the side of the revision box, which should be consistent with the backer of the official platen printing. Fix it with transparent double-sided tape paper respectively, and then put it on the photosensitive table for exposure. In this way, the alignment is much easier when it comes to official printing

development: first wet both sides of the plate with tap water, soften it for minutes, and then wash the printing surface with a small high-pressure water gun. The pressure should not be too high during washing until the plate reproduces the negative film. Then rinse both sides of the plate with tap water until there is no softened photoresist residue left. Dry version, repair pinholes, re exposure, to increase the modulus of elasticity, the maximum experimental force 8 plus version durability

printing

printing machine: the flat printing machine is the most important hardware to improve the printing effect. For four-color printing, the flat printing machine with higher alignment accuracy than that of polymer composites in the field of wind energy should be selected. The printing table must be flat

scraper: in order to obtain high-quality prints, a scraper with a hardness of 70 degrees should be selected. The printing squeegee surface should be smoothed with a grinding machine, and the edge should form a linear contour, with an effective scraping angle of about 70 degrees. The pressure of the printing scraper should be adjusted to be consistent

size: md-994 four color dot ink is selected. This new product has good thixotropy and pH value. In addition, it is equipped with auxiliary adjustment: stock diluent, standard color deepening agent, blocker, basic stock, and base stock

printing: the edition sequence is yellow, blue, red and black. At the beginning of edition alignment, the Black Edition shall be printed first, and then the edition shall be aligned one by one. The four-color edition can be printed only after the alignment is correct

manual printing and machine printing: for large-scale manual printing, four operators with relatively tacit hand feeling strength should be selected for trial printing. The printing table must be flat. Special attention should be paid to the distance (that is, the distance between the plate and the platen) should be controlled within mm. It is particularly emphasized that the printing speed of the scraper also affects the printing effect, so the speed must be determined according to the fineness of the four-color printing pattern and the characteristics of the background color, moisture absorption and surface structure of the printing material. Compared with the original color manuscript, it will be officially printed after all aspects of debugging are correct