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UV curing can be used for a variety of traditional printing formats, including letterpress, flexo, lithography, screen printing, etc., as long as the use of UV ink, with the UV light source to complete the main part. The lithographic UV printing is a lithographic structure that uses UV inks and UV light sources. Of course, some very important matching conditions need to be achieved at the same time.
1, the characteristics of UV ink
advantage:
â— Instant curing after exposure to ultraviolet rays, post-press processing can be carried out, and the delivery of finished products is short-term;
â— Do not spray powder, the operating environment is good, you can avoid the quality problems caused by dusting;
â— Can be printed on paper other than the substrate (plastic film, gold and silver cardboard, aluminum foil, etc.) This feature can print more product types than traditional lithography, has a broader market future;
â— There is no evaporation of petroleum solvents and there is no pollution to the environment. VOC=0;
â— very good friction resistance;
â— Less paper loss
â— Compared with thermal drying, the drying device has a small footprint;
â— Intermediate drying in online printing becomes possible;
â— It can be dried immediately at the same time as printing, which can greatly improve the production efficiency. Since there is no need to wait for the ink drying time, the production time can be greatly shortened, and the printing company can also save a lot of space for storing dry prints, which is helpful for cost savings. .
Disadvantages:
☆ The price of ink is relatively high;
☆ Storage costs are relatively high;
☆ Compared with general oiliness, skin irritation is relatively large;
2. Comparison of UV ink and other inks:
â— There is no evaporation of petroleum solvents, and it is harmless to the global environment. VOC=0;
â—No dusting, good operating environment;
â— Can be printed on paper (plastic film, gold and silver cardboard, aluminum foil, etc.)
â— very good resistance to friction;
â— It can be processed after printing.
2-2. Comparison of Oily Offset Transfer Printing (Heat Coagulation) and UV Offset Transfer Printing Inks
* Total energy is based on simple conversion of heat and electricity
â— The total energy used is 1/2-1/3 (presumed) of the heat-curing offset printing rotary press, with low energy consumption;
â— There is no evaporation of oil-based solvents, harmless to the global environment;
â— Less shrinkage and swelling of paper, good abrasion resistance, good processability;
â— Less paper loss
â— The drying device has a small footprint.
2-3. Comparison of synthetic paper ink and UV ink
â— no dusting, good operating environment;
â—Because it is instantaneously dry, the printed matter can be stacked;
â— Good stability on the press;
â— very good friction resistance;
â— Can be processed after printing.
2-4. Comparison of Gravure Ink (Solvent Type) and UV Ink
Gravure ink (solvent type) UV ink
Solvent Low Boiling Solvent
A lot of solvent evaporation
Drying method Thermal evaporation Drying UV irradiation Photopolymerization curing
Substrate paper, plastic film, metal film, paper, plastic film, metal film, etc.
Friction resistance is very good and very good
Processing performance can be processed after printing
Good reproducibility benchmarks for outlets
â— There is no evaporation of low-boiling solvents, which is harmless to the earth's environment.
The operating environment is good. VOC=0;
â— There is no risk of fire;
â— The reproducibility of outlets is good;
â— can undertake a small amount of orders.
3, UV ink in a variety of printing applications
Printing Type Substances End Use Reasons Usage
Thick cardboard printing paper food, general box coloring book does not need to spray powder
Aluminum Foil Composite Paper Cosmetics Beverage Container Low Odor, Friction
Metal plate printing metal plate beverage cans, art jars do not have to be dried
Invoices such as printed offset paper requests, lottery scratches, heat resistance
Instant printing of trademark printing glossy paper, general trademark, metering paper
Card printing PVC, PET credit card, phone card instant curing, friction resistance
Film printing PPPVCPET video cassette, advertising, folder instant curing, friction resistance
Cup Printing PS Polystyrene Commodity Containers (Instant Noodle Containers, etc.) Instant Curing, Friction Resistance
Disc Printing PC (Polycarbonate) Disc, DVD Instant Curing, Friction Resistance
4. Application of UV ink in packaging and printing market
â– Tobacco and wine packaging and cosmetics packaging
â– Credit card, phone card
â– sticker printing
â– Hose printing
â– Plastic film printing
Circuit board printing
â– Disc printing
5, the general traditional printing presses into UV printing presses
â—†Adjustment of the printing machine--Addition of ultraviolet rays to the ultraviolet irradiation lamp device--The effective wavelength for ultraviolet curing is 200-400 (nm)
Ultraviolet Lamps - Metal Halide Lamps and Mercury Lamps High-pressure mercury lamps are based on 365nm as the main wavelength, near the wavelengths of 254nm, 303nm, and 313nm, and emit highly efficient UV wavelengths. They are mainly used in the curing of UV light oils and inks.
Metal halide lamps emit UV wavelengths mainly in the range of 200-245 nm. Compared with high-pressure mercury lamps, the emission of long-wavelength UV light is more, and is mainly applied to the curing of UV inks.
â—† Ink roller needs to be replaced by UV or dual-use
â—† The blanket needs to be replaced by UV or dual-use
â—† exchange of tooth decay
â—† Use of UV-specific or dual-use version (heat treatment with PS plate of positive image, bake at 250oC for 10 minutes)
â—† Selection of fountain solution: Do not use fountain solution containing excessive gum arabic)
The choice of lotion
6, UV ink printing notes
6-1, UV ink,
In general, yellow and red are relatively easy to transmit ultraviolet rays, and blue and black, particularly black ultraviolet rays, are difficult to transmit. Therefore, if the printing density is increased too much in order to improve the printing effect, poor curing may occur, the ink may be easily wiped off, the adhesion may be poor, and even the back surface may be dirty. In the UV printing, special attention should be paid to the printing density of the black ink.
6-2. Among various base materials, there are also a small amount of base materials that have poor adhesion to UV ink, scratch resistance, and flexural flexibility. In particular, synthetic paper and plastic substrates are quite diverse and there are also surface treated and untreated substrates. Ink is also quite different for various substrates, such as adhesion performance, so it is very important to choose a suitable substrate for UV ink, or to select an ink suitable for the substrate. UV inks are used for paper and plastic, and there are several types of UV inks for plastics. Be sure to test adhesion and other properties before use.
6-3. Even if the substrate is paper, due to the difference in the type of paper, the type of ink, and the difference in curing conditions, accidents with low adhesion may occur, and attention should be paid to performing pre-tests.
6-4. Our company's UV inks are, in principle, ready for use without adjustment, but depending on the quality of the paper, the room temperature and the printing conditions, 2-5% of UV-specific varnish or debonding agent can be added.
6-5. If auxiliary or detergent is used, use an auxiliary or detergent specific to UV ink.
6-6. Please do not mix with oily ink. If it must be mixed with other inks, you must confirm the fluidity, adhesion, printability and gelity of the ink after mixing.
6-7. After UV inks are mixed with UV inks, fluidity deteriorates, the gel speed increases, and the brightness becomes weak. Therefore, please do not save the mixed ink for a long time.
6-8. If the ink is stored at a high temperature, gelling, hardening, etc. may occur. Please store the UV ink in a dark place below 25oC.
6-9, especially gold and silver ink, than the average
UV inks are prone to coagulation and brilliance, so do not store them for long periods. 6-0, UV inks and general oily ink, the water is relatively narrow, especially after the ink emulsification, the emulsified ink will accumulate in the ink roller, and remain on the layout and blanket, causing dirt and other printing problems. At the beginning of printing, compared with oil ink, the supply of ink in the ink fountain is not very good compared to the oil ink, so there is a tendency to open the ink fountain too much. The supply of the ink in the way is gradually increased, and the ink on the printing press is excessive, resulting in ink emulsification. . So pay special attention to the supply of ink and water.
UV ink characteristics and market application status
Ultraviolet ink, that is, UV ink is ultraviolet radiation of a certain wavelength, and it is polymerized and solidified by an instant photochemical reaction. UV curable inks were originally used in the United States in 1969 in thick paper printing. In 1971 Japan began to apply metal printing and sticker printing. It is an environmentally friendly ink that has been rapidly developed in recent years. It quickly captures the packaging and printing market with instant curing, free of volatile solvents, and simple and convenient applications.