Thermosetting ink, also known as plastic ink, or self-adhesive ink. Its ingredients: mainly composed of polyvinyl chloride (PVC) and phthalic acid esters, and polyvinyl chloride and phthalate esters, color fixing agents, stabilizers, and thickeners Ink. Thermosetting inks entered the market earlier, but due to the unfamiliarity of operation and the limitation of production equipment, the promotion speed was relatively slow. Now it is very mature from its marketing to production and operation. Thermoset ink basic requirements Do not use polyester hard board, the table also use hard type, and now tempered glass is more common, the use of the screen should be flexible according to the printing pattern. Such as: fine network transition recommended for 150 mesh - 250 mesh between the more suitable, thermosetting ink itself does not require photopolymer. General printing patterns are recommended for water and oil. This makes it possible to use either water or solvent when rubbing the board. Three-dimensional thick film printing pattern To use a special thick film board, photosensitive adhesive coating made of thick film? . In the screen, one coat of ordinary thickness is applied, and the outer one is coated with a round knife at a time according to the thickness of the pattern or coated with a common sizing device for multiple times. The oven can be placed in a baking box for 40, 50, and 60 minutes to dry. exposure. Due to the difference in exposure and the exposure box power, the exposure time must be tested. After development, it must be placed in a baking oven to dry the water at a low temperature. Do not expose to sunlight when it is dry. Temperature is the key to characterizing thermoset inks. Therefore, the tunnel drying heating equipment is recommended to use good heat insulation and stable heating and temperature stability. Thermosetting ink special additives Thermosetting ink is a very independent printing material. She has her own special printing aids. Such as: thinner, thickener, softener, fixing agent and so on. If many additives are added during the operation, it is recommended to contact the manufacturer first. Listen to suggestions before proceeding. Do not add or subtract auxiliaries on the basis of experience and cause unnecessary waste and loss. Thermosetting ink process Thermosetting inks are divided into ordinary and special two types of processes according to the different printing effects. Ordinary printing process refers to a simple, solid, line of monochrome color printing. In addition to heating, such processes are no different from ordinary printing processes. Easy to operate, no need to wipe and plasticize, several times higher than the performance of water-based printing materials. Special printing process refers to three-dimensional printing, foam printing, suede printing, gravel printing, wire drawing and so on. Three-dimensional printing requires the use of thermosetting inks and three-dimensional gels. For example: three-dimensional thermosetting special dry brush thick film. After the printing pattern is plasticized, the hand feels soft, the tensile strength is strong, the washing fastness is good, and the 90° right angle outline is clear. . It is recommended that the film thickness of the thick film film is lower than the thickness of the printed pattern. In this way, the thickness required for the pattern can be divided into two to three times, and the printing effect will be better and more ideal. The operation of foaming, suede, pebble, wire drawing and other special plastisol inks is the same as ordinary plastisol inks. The effect after printing depends on the amount of additive added. Grasp the curing temperature of curing ink The reason for most of the failure cases is that they have not grasped the curing temperature and time. Ordinary printing pattern, curing generally requires 170 ° -180 ° timing 1 minute. Special printing patterns, curing generally require pre-baking 100 ° / 30 seconds, the surface drying and then enter the drying tunnel dryer 170 ° -180 ° 1-2 minutes. (The white fabric is easy to change color at high temperature, the temperature is reduced properly, and the time is prolonged.) Another: The thermosetting ink foam is suitable for the foaming machine and the surface is flatter. Common problems in thermosetting ink operation 1, ink brushing is not clean ... if the viscosity is not big with thinner, 1% can be 2, the pattern edge is uneven ... too many back blade, or ink is too thin 3, thick film pattern or surface bubbles ... curing temperature is not high enough or not long enough 4, the pattern surface is dull, there is no tension, it is powdered off, and it is not cured. 5, after the overheating ink discoloration ... ... fabric sublimation traction is absorbed by the ink, it is recommended for pre-impression sample test, if the cloth color is easy to sublimate, need to use anti-sublimation thermosetting ink. 6, water-based glue and thermosetting ink superimposed on each other printing, but the water slurry can be overprinted thermoset ink 7, water-based printing color, can not be mixed with thermosetting ink 8, thermosetting ink is not a universal ink, fabrics of different materials should use the appropriate thermosetting ink 9, Climate, environmental changes will affect the viscosity of thermosetting inks, and thinners or thickeners (up to 2%) may be added as needed. Note: This information is provided by Qingdao Shengcai. Source: Ink News
Thermosetting inks are non-solvent inks. After heating, powders and additives dissolve and plasticize and penetrate into fibers to form a firm film. Due to the restricted use of polyvinyl chloride, polyvinyl chloride can be replaced by a modified body to make a thermosetting ink that meets environmental protection requirements. Because of the different temperatures of PVC plasticization, thermosetting inks can be divided into two categories, high temperature and low temperature.
Technical Application of Thermosetting Inks and Common Problems in Operation