Characteristics and application of the most popula

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Characteristics and use of water-based UV screen printing ink (Part 2)

water based UV screen printing oil can ensure that 3D printing and additive manufacturing achieve the best mechanical properties. The use of ink

(1) product use process

(2) product use method

· the temperature in the storage room is 5 ~ 30 ℃, so that the ambient temperature is 20 ~ 30 ℃, too low and too high temperature will increase or decrease the viscosity of the ink. The indoor temperature is stable, which can ensure the consistency of printing operation conditions and the stability of printing quality. Pay attention to the seasonal changes in spring, summer, autumn and winter and the adjustable temperature changes in the experimental space in the morning, noon and evening every day, which can make the operating temperature different. It is necessary to put a temperature and humidity meter next to the printing machine

· this product has great thixotropy, and the viscosity will be reduced to a certain extent after full mixing. The mixing time before use is not less than 5 minutes. When it is necessary to reduce the viscosity, please use the supporting diluent, mix it while stirring, and the dosage shall not exceed 8%. Do not mix with other series of inks

· the data collection system composed of high-speed analog-to-digital converter CPLD of ad company uses 350 ~ 450 mesh high tension pet monofilament (even after calendering) and stretched with aluminum alloy frame, so that the tension reaches 18 ~ 24 Newton; Water and oil dual-purpose water-resistant film detachable photosensitive adhesive plate making. The thickness of ink wet film is mainly determined by the mesh number of silk and the thickness of gluing. The adhesive layer is required to be 4 ~ 5 m to ensure that the ink film is 6 ~ 8 M. The drying speed of the ink layer with a thickness of more than 10 m is slow, and the adhesion and bending resistance will be affected

· please use 80 UV special polyurethane scraper, because some resin materials in the ink have expansion effect on the scraper. When the blade is not suitable for printing, it is necessary to rotate, grind, reverse and even replace it

· this product is most suitable for printing on coated PI synthetic paper PVC, KT board, Andy board and pure paper of Nanya company in Taiwan. The printability of other substrates should be subject to trial and print evaluation

· a new print and a new substrate should be prepared for testing and comprehensively evaluate the process ability and various indicators of the print, such as adhesion, bending resistance, etc., and master and determine various parameters. At the same time, it is also very necessary to convey relevant knowledge and operation technology to relevant personnel

· choosing and purchasing a curing machine with good performance is not a simple problem. High and stable unit power and low calorific value are the most important performance. High pressure mercury lamp or metal halide lamp with unit power above 120w/cm and effective heat dissipation mechanism must be equipped. The light intensity will decrease after the lamp is used for a period of time,

the change of light intensity should be detected regularly for necessary adjustment or replacement. The heat generated by the lamp should have an effective cooling method, and the appropriate lamp distance and belt speed should be adjusted to avoid inaccurate overprinting or even scrapping caused by thermal deformation of the printing material

· there are certain differences in the curing conditions of different color inks. Generally, the order from easy to difficult is red, yellow, blue and black. The printer's own mixed color can only master the accurate curing conditions after testing. The ink layer after light irradiation does not immediately reach the best curing degree, and stable adhesion can be achieved in 24 hours

· when printing with different colors, the curing of the front color should not be too complete, and the first color must use an appropriate fast belt speed, because excessive surface curing reduces the surface energy and affects the interlayer adhesion of the second color. The specific control method obtains data during the preliminary test

· poor adhesion is often caused by insufficient curing. This problem is mainly concentrated in the use of black ink. Black ink has a large absorption capacity to light, so that the light energy received by the photoinitiator is reduced, and the curing is slow. When printing, the gap between the printing plate and the substrate is appropriately adjusted to form a thin ink layer as much as possible

· when it is necessary to reduce the color concentration, use colorless ink; When you need high gloss effect, you can cover and print the gloss oil, or you can choose to use high gloss series inks

· the unwashed version shall not be placed in a place with light; When cleaning the version, you can scrub it with industrial alcohol first, and then wash it with detergent solution to wash the ink. The public financial revenue of Heilongjiang Province is only about 130billion yuan a year. Clean it with 783 once, then remove the film and ghost, and finally rinse it with clean water to dry it completely

· the validity period of ink is 6 months from the date of production. Products beyond the validity period can still be used normally if they can be used effectively after inspection and trial. When not in use, the ink should be tightly covered and stored in a dark and cool environment. The recycled ink is only contained in empty barrels to avoid polluting the new ink

· if a printing factory that has used solvent based ink for many years is ready to switch to UV water-based ink, it is necessary for managers and producers to carry out comprehensive training on new knowledge and skills. As an ink supplier, I am very willing to provide help within my capabilities

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