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Thermosetting ink printing 3D pattern production process and methods

thermosetting ink Dalian Rongke obtained the 3D pattern printed by the 200mw/800mwh full vanadium liquid flow battery energy storage peak shaving power station project in 2016. Now it is widely used in clothing, especially the logo on many sports brand clothing, which adopts the thick plate printing process to replace the traditional computer embroidery process, so that the brand clothing can reach a new level

printing fine 3D patterns has strict requirements on film production, ink use, printing method, printing method, thermosetting treatment and other links. The standard of a high-quality 3D print is: clear impression and strong three-dimensional sense. There are two concepts involved here: clear imprinting, from the perspective of printing, means that the edges of the printed matter should be neat, the corners of the right angle type should be sharp, the edges and faces should be 90, the surface should be flat, and the corners of the fillet type should be round and bright; The second is the strong sense of three-dimensional, which means that the fingerprint reaches a certain height of the ink layer. The higher the height, the stronger the sense of three-dimensional. The above quality standards are relatively easy for printing large patterns, but if it is a very small pattern, it will increase many technical difficulties. We take the printing of cylindrical dots with a diameter of 1mm and a height of 1.5mm as an example to explain various production links and technical problems

plate making film: prepare two films, one for the front image and the other for the mirror image

version: prepare two versions, one for 100 mesh silk as thick version, and the other for 180 mesh silk as overlay version. The tension of the two versions should reach 20n/cm

thick plate photosensitive adhesive coating: use a large round mouth sizing device to apply twice on the scraping ink surface of the plate, then apply it on the printing surface (the contact surface with the substrate) for 4 ~ 5 times, and continue to apply glue on the printing surface after drying. Finally, the thickness of the printing surface adhesive reaches 0.2mma Folds ~ 0.3mm appear around the cup that affect the accurate measurement of ear making rate

printing method on both sides: first stick two plate making films to both sides of the plate with double-sided adhesive tape, and align the cross positioning line. The exposure time is one third of the normal single-sided exposure. If the total exposure takes 3min, first expose and scrape the ink surface for 1min, and then expose for 2min according to the conventional method. Why use two film exposures on both sides? We can find out the difference between one-sided exposure and two-sided exposure of thick plates. Single side exposure: in the process of light irradiation, because the photosensitive adhesive has a certain thickness, the light irradiates upward through different angles, so that the actual covering part at the top of the photosensitive adhesive is smaller than the actual size of the film, and the exposed template is conical. The dots printed with this thick plate must also be conical. The upper and lower surfaces are exposed, and the film version is cylindrical. Ink use: there are two methods, one is to use transparent thermosetting ink as the base, and then use colored ink for overprint, the other is to use thick printing transparent ink, and when it reaches the required height, use thin printing colored ink to cover the surface. The ink should be thoroughly stirred before use

doctor blade: hardness 70 ~ 75, sharp blade and right angle blade

pitch: the pitch should be determined according to the printing results. If the printed version cannot pop up quickly, it indicates that the pitch is too small. If there are many pinholes on the imprinted surface, and the viscosity of the ink is not large, it indicates that the pitch is too large, and the ink of the hole is not completely adhered to the substrate after cutting, and then it is picked up and stored in the hole by the ribbon

printing and bulk drying: there are two forms of printing: one is mechanical printing. Large area 3D patterns are suitable for automatic garment printing machine operation, while small area fine 3D patterns are suitable for manual platen printing, because the height of 3D printing is completed by the thickness and printing times of the plate. The thicker the plate is, the less the printing times are. However, small area 3D plates cannot be made too thick, so more printing times will inevitably increase costs and work efficiency is not high

before printing, the surface of the substrate must be leveled, especially the cotton knitted fabric. The yarn count surface is not smooth, and there is a layer of wool fiber on the surface after weaving. Because the ink coloring area is small, it has no fastness if it adheres to the suspended wool fiber. Usually, the leveling method is to use a plate to stick adhesive paper on the printing part, and then use a scraper to scrape and press on it, so that the back of the plate squeezes the substrate. This method is not very effective. The author designed a roughening device which can be used in both automatic machine and manual operation (introduced in another article), and the effect is relatively good

the key link of 3D printing is the first time of priming. If the first time is printed well, the quality will be guaranteed, and the printing times will be reduced. Fill up the printing ink for the first time. At this time, the height of the imprint is the thickness of silk plus photosensitive glue. If the hollowed out part of the plate is filled for the first time, it can effectively reduce the printing times and ensure the quality of the back overprint, because the height of the back overprint is the thickness of the silk

in case of manual printing, when printing the first time, the force to start scraping the ink should be large, so that the ink can fully contact the printed matter to improve the adhesion fastness. When the hole is filled, the ink should be gently collected to make the ink layer as high as possible. After each printing, it is necessary to carry out bulk drying. There are two methods of bulk drying, one is the bulk oven, and the other is blowing with a torch. According to GGII, it is expected that the temperature and speed of bulk drying should be controlled to just stick the ink on the ink surface. The surface curing temperature of thermosetting ink is about 100 ℃. Too high temperature of bulk drying will make the ink layer thinner, thus increasing the number of printing. After heat curing treatment, the curing temperature of thermosetting ink is about 160 ℃, and its baking time can be appropriately extended, so that the ink is completely cured and firmly attached to the substrate. The method to check the fastness is to stick the substrate with adhesive tape, and then pull it apart. If there is no deinking, it means that the fastness is good