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, polyvinyl chloride (PVC) is also replaced by a modified body, and PVC-free low-temperature thermosetting is performed to meet environmental protection requirements. Ink. Because the polyvinyl chloride plasticized and unmodified curing temperatures are different, the produced thermosetting inks are classified into two categories, high temperature and low temperature. The high temperature curing temperature is 180°-190°, and the low temperature curing temperature is 140°-155°. The low-temperature thermosetting ink produced by Lucky Company meets the requirements of environmental protection and does not contain PVC or formaldehyde, and meets the environmental standards of European countries for export.
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.
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. General printing pattern, high temperature thermosetting ink curing generally requires 170 ° -180 ° timing 1 minute (low temperature thermosetting ink curing also 140 ° -155 ° timing 30 seconds - 1 minute. Special printing patterns, curing generally need to pre-bake 80 ° / 30 seconds, the surface drying and then into the drying tunnel dryer 170 ° -180 ° 1-2 minutes (low temperature thermosetting ink curing also 140 ° -155 ° timing 1-2 minutes). (White surface cloth easy to high temperature Discoloration, appropriate temperature reduction, time extension) Another: thermosetting ink foam foam machine for hot pressure, the surface is more smooth.
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 ... ... cloth color sublimation after the traction is absorbed by the ink, it is recommended for pre-impression sample test, if the fabric is easy to sublimate, need to use anti-sublimation thermosetting ink, or contact the ink manufacturer.
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 and environmental changes will affect the viscosity of thermosetting inks. Diluents or thickeners (no more than 2-5%) may be added as needed.