Types and applications of the most popular decorat

Types and applications of commonly used decorative UV printing inks

in recent years, with the development of UV ink and UV curing technology, decorative UV printing ink extraction is more and more widely used in packaging printing. Using decorative UV printing ink can produce some special artistic effects after printing, so as to decorate and beautify the printed matter

commonly used decorative UV printing inks

there are mainly the following kinds of decorative UV printing inks

uv imitation metal etching ink is usually printed on gold and silver card paper with high gloss. The frosting effect on the surface of the printed matter makes the printed matter have a suspended three-dimensional feeling, rich, luxurious and unique. It is widely used in packaging and printing, especially cigarette and wine boxes. Generally, there are sanding inks of different thickness to choose from

2. UV wrinkle printing ink

uv wrinkle printing ink is usually printed on gold and silver card paper with high gloss. The printed matter is first irradiated by weak UV light, so that the ink pumping surface is completely nationalized, and the interior is in a semi curing state. The UV ink on the surface produces concave convex lines due to curing shrinkage. Then, through strong UV light irradiation, the UV ink is solidified as a whole (external and internal), which can achieve the surface effect of metal hammering or skirt wrinkle. Wrinkle printing is elegant and noble, with good decorative effect. It is commonly used in the printing of cigarette boxes, wine boxes, gift boxes, cosmetic boxes, calendars, books, etc

3.uv coral printing ink

uv coral printing ink is usually printed on gold and silver card paper with high gloss. At the same time of printing, the ink bubbles, which gather together, and the irregular continuous accumulation and bubble free smooth parts together form coral like lines, which can also be said to form three-dimensional coral like lines instantly

4. UV ice printing ink

uv ice printing ink is usually printed on gold and silver card paper with high gloss. The printed matter is first irradiated by weak UV light to solidify the ink surface and semi solidify the inside. Then, through strong UV light irradiation, all UV inks (external and internal) are solidified, so as to produce ice flower effect. Generally, the devices that produce ice electronic universal testing machines of different sizes and the preliminary accuracy alignment will transport the tensile testing machine and dynamometer to the root of concrete respectively, and the ink with flower effect can be selected

5. UV printing refractive ink

uv printing refractive ink is suitable for printing on all kinds of gold, silver paperboard and mirror paper merchants with specially made plates. After UV light irradiation, the ink film has obvious refractive effect. At the initial stage, supporters can also buy the cordless screwdriver version

6 at the price of 145 euros (US $159). UV printing crystal grain ink

uv printing crystal grain ink is added with blocking agent. Because the surface curing speed is different from the internal curing speed, the crystal grain is formed, which is mainly used in the decorative process of crystal grain on the surface of glass and metal

decorative UV printing ink printing process in order to ensure the printing quality of decorative UV printing ink, the following process factors should be paid attention to when printing

1. number of silk meshes

UV inks for different purposes have different printing meshes due to different printing requirements. Generally, the higher the fineness of printed matter, the higher the number of silk meshes required. When printing eye tone products, it is generally required that the ratio of the number of wire mesh selected to the number of threads added is 4:2

for the printing of decorative UV printing ink, the mesh number should be selected according to the specific requirements of the ink. For example, when using UV printing imitation metal boring ink for printing, the number of wire mesh should match the thickness of the sand type of the ink. If the sand type is relatively thick and the particle size is large, the wire with lower mesh number should be selected, and the pore diameter of the wire is large, which can make the ink leak onto the printed matter through the wire. Otherwise, some will remain on the plate, resulting in less sand on the printed matter. And with the progress of printing, the viscosity of the printing ink gradually increases, and the ink particles continue to accumulate. If the sand mold is fine and the particle size is small, you can choose a higher mesh number of silk. Generally, the number of days of silk is l5o -250 mesh/inch, and the higher the mesh number of silk, the finer the sand grain printed

when printing with UV wrinkle ink, the number of silk meshes can be selected according to the size of wrinkles to be achieved. The higher the number of silk meshes, the smaller the wrinkles, and vice versa. Generally, the number of wire mesh is any 120-200 mesh/inch. When UV printing coral ink is used for printing, the situation is similar to that of UV printing wrinkle ink. The number of wire mesh can be selected according to the size of coral ripple to be achieved. The higher the number of wire mesh, the smaller the coral ripple, and vice versa. For UV printing ice flower ink, the mesh number of German silk should match the size of ice flower

2. Distance

printing time, the distance between the plate and the printed matter (i.e. distance) also has a great impact on the printing effect. If the distance is too small, the imprinting edge is not clear, and the printing effect of decorative ink is not obvious. If the distance is too large, it will have a certain impact on the printing accuracy, and even tear the wire. Therefore, the printing time interval should be appropriate

3. scraping angle

scraping angle is related to the ink output during printing. The scraping angle is large, the ink output is small, the ink color of the printed matter is light, and the effect of decorative ink after printing is not obvious. Too small scraping angle and too much ink output will cause serious ink spreading, and the printing fineness will be affected to a certain extent. Therefore, the scraping angle should be appropriate during printing

4. printing pressure

printing pressure also has an impact on the amount of ink obtained during printing. The printing pressure is small, the ink output is small, the ink color of the printed matter is light, and the effect of decorative ink after printing is not obvious. Too much printing pressure and too much ink output will cause serious ink spreading and even tearing of wires. Therefore, the printing pressure should be appropriate when printing

5. printing speed

the printing speed will also affect the ink output during printing. The printing speed is too fast, the ink output is small, and the ink color of the printed matter is light. In addition, the effect of decorative ink printing is not obvious, so the printing speed cannot be too fast

of course, the above process conditions should match each other. For example, if the printing speed is fast, a larger printing pressure and a smaller scraping angle should be selected for printing, and the viscosity of the ink should not be too high

6.uv curing light source

because the curing of UV ink depends on the polymerization and cross-linking reaction after the photoinitiator absorbs the radiant energy of UV light, the selection of UV light source has a crucial impact on the curing speed of UV ink. The following factors should be considered when selecting the curing light source

(1) the output spectrum of the light source should match the absorption spectrum of the photoinitiator as much as possible, so as to maximize the use of the radiation energy of the light source and produce more free radicals, so as to improve the curing speed of UV ink. The common UV ink curing light source is the medium pressure mercury lamp (included in the high-pressure mercury lamp in China), which mainly emits the following wavelengths: 405mm, 365 366nm, 312 3l3nm, 302 303nm, 297nm 265nm, 254nm and 248nm

(2) the efficiency of converting electric energy into UV light should be high

(3) the light intensity should be appropriate

if the intensity is too high, the free radicals will be produced quickly, and its too high concentration will accelerate the planting reaction, which will have an adverse impact on the cross-linking reaction. The strength is too strong, the speed of producing free radicals is too slow, and the oxygen polymerization inhibition effect will be strong, which will slow down the curing speed of UV ink

(4) long service life. UV lamps will gradually age, and the light intensity of expired UV lamps will decrease a lot, making the curing of UV ink too slow

(5) there should be a good lampshade to focus light. The quality of the lampshade has a great impact on the curing efficiency of UV ink. The same UV lamp, different lampshades, the curing efficiency of ink can even be dozens of times different

(6) the shape of UV lamp is appropriate, which can make the light source shine evenly on the printed matter, and it is easy to install, cheap, safe and reliable. Generally, tubular lamp is used

(7) since ozone will be produced in the air under the irradiation of UV lamp, ventilation equipment should be provided. The power density of the medium pressure mercury lamp used for curing colored ink is generally 120W/cm, and the power density of the medium pressure mercury lamp used for curing colorless ink is generally 80W/cm. The lamp length can range from a few centimeters to 200cm, Diameter L5 "25cm. Due to its high temperature in application, it needs to be cooled, and its service life is generally about 1000 hours. Mercury lamps need ballasts. The light intensity of the lamp is certain, and the current and voltage can be adjusted. Either the current is significantly lower than that 3 years ago, and the voltage is low, or the voltage is high and the current is low.

mercury lamps need a preheating time after they are turned on to facilitate the evaporation of mercury. During the preheating of mercury lamps, the expected UV light cannot be obtained. Mercury After the light is turned off, it cannot be started here immediately. It needs to be cooled for a period of time, which will bring some inconvenience to the use. Now, a kind of electrodeless mercury lamp has been introduced in the market, which can be switched on and off instantaneously, with long service life and high power. The spectrum of the electrodeless mercury lamp used for UV curing is continuous, which is different from the medium pressure mercury lamp. It can be used for curing thick films

source: ink information