UV inks and water-based screen printing inks will be a big market, and most of the inks currently used in China are solvent-based inks. Solvent-based inks are volatile dry-type inks. The drying time is slow. Natural drying takes 8 hours. During the drying process, 60% of the solvent must be volatilized. This serious pollution, under the current slogan "Return to Nature and Environmental Protection First", is not only restricted by the strict regulations of government departments, but also opposed by the neighbors The screen printing factory does not want to use it. Therefore, it is inevitable that UV ink and water-based ink will occupy the screen printing market in the future.
1. Market trend of screen printing ink (UV ink)
At present, in terms of output and varieties of screen printing inks, volatile dry inks are the mainstream, but the output of UV inks has increased year by year, and the growth rate is larger. It is only a matter of time that its output exceeds volatile dry screen printing inks. Due to the increase in the types of oligomers, prepolymers, and polymerization initiators in the raw materials of UV screen printing inks, the application scope of UV screen printing inks is more extensive, and it can be suitable for various printing materials. The occupancy rate will definitely increase.
1. Screen printing ink (UV ink) is suitable for all kinds of printing materials. Paper, coated paper, wood products, synthetic paper, polyvinyl chloride (PVC) 1 propylene (PMMA), acrylonitrile-butene-styrene terpolymer, acrylonitrile-styrene copolymer, styrene (PS) , ABS, polycarbonate (PC), polyester (PET), polyurethane, treated polyethylene, treated polypropylene, plastic coating surface, polyethylene plastic (PE), wood products coating Surface, coated metal plate, glass ceramic, thermosetting resin.
2. Screen printing ink (UV ink) has strong functional performance. Screen printing ink (UV ink) is suitable for high-quality products, diversified and special-shaped products requiring special processing.
â‘ Physical: LCD display screen, anti-corrosion soldering; electrical insulation, conduction, electric field luminescence, magnetism, etc .; thermal temperature foaming, temperature indication, pearlescent, fluorescent, night crystal, thermal transfer, etc.
â‘¡ Chemical, medicinal, corrosion, ethanol stripping, etc .; biochemical, antibacterial, antifouling, etc .; absorption, adsorption, reaction, waterproof, oxidative corrosion, etc.
â‘¢Surface decoration: crystal glue, anti-metal etching, matt wrinkle, non-glare, mirror metal, etc .; three-dimensional, thick film printing, braille, crystal pattern, wrinkle, cracked graphic, coral pattern, etc.
2. Market trends of water-based printing inks
Among the volatile and dry printing inks, water-based printing inks developed in the 1980s have been valued because of their environmental benefits. At the beginning of the development of water-based printing inks, it was once attracted attention, but because of the poor water demand of the template, and the problem of wrinkling caused by the moisture absorption of the paper when printing on paper, it has not gained popularity. After entering the 1990s, the above problems were gradually solved. With the advent of new water-based printing inks using urethane emulsions, their varieties are also increasing.
From an objective analysis, because the function, use, price, equipment, and supply of (water-based printing ink) are superior to screen printing ink (UV ink), in the future in the screen printing ink market, traditional printing ink will slowly disappear , Replaced by water-based inks and UV inks, and finally water-based inks completely occupy the market. Commercialized water-based printing inks have met the principles of simplicity, practicality and economy. The three major shortcomings of the past have now been overcome.
1. The drying problem of screen printing water-based ink.
The biggest disadvantage of water-based printing inks is that the drying is slower than solvent-based. Theoretically, the evaporation energy of water is 4-5 times greater than that of oil. How to improve the drying property is a comprehensive problem. After years of research, the composition of water-based printing inks has been completely improved. ①First, reduce the water content of the past water-based printing ink from 70% to 30%. ② It is to make the water-based printing ink ultrafine, so that the water-based ink that can only be used for 150-mesh screen printing can be used for 300-mesh screen printing. In this way, the printed film becomes thinner and drying is accelerated. ③ Under the premise of not hindering the printing effect, reduce the viscosity of the water-based printing ink, reduce the surface tension, and promote the capillary phenomenon to improve the effect of evaporation drying and penetration drying. ④The most important thing is to have an efficient infrared dryer. Because infrared is radiation energy, it has penetrating power and can directly interact with the molecules in the printing ink. It heats up at the same time both inside and outside to promote instant drying. Now the water-based printing ink is used for color printing. The instant drying between colors is 150 ℃ As long as 5s. This drying speed is almost as fast as screen printing ink (UV ink).
2. Adequacy of water-based printing ink
In the past, water-based printing inks used for water-absorbing objects (porous objects) such as: cloth (cotton, linen, wool, silk, polyester, nylon and their blended fabrics), paper (paper, cardboard), wood (wooden boards, woodware, plywood) , Leather (leather, artificial leather), etc. are good, but it is more difficult to adhere to the hard surface of the printing material. Now because the fixing agent of water-based printing ink is acrylic, polyester, polyester superposition resin, its all-round adhesion function is applicable to non-absorbent substrates, smooth and hard substrates, and objects that have been difficult in the past. Very good adhesion. Such as water repellent cloth, synthetic paper, thick canvas, rigid PVC, PVC, stickers, PVC cloth, artificial leather, acrylic, ABS, AS, PET, PS, glass, duralumin foil, stainless steel, etc.
3. The problem of full water-based printing ink
Although water-based printing inks in the past have been water-based, most of them have added 10% -15% of solvent, the purpose is to improve the flexibility, vividness of printing ink and prevent bleeding. The current water-based printing ink has been able to overcome the above problems and is a full-water printing ink.
The development of water-based printing inks has now become a hot topic for screen printers, because the state has regulations on environmental protection, screen printing practitioners have awakened themselves, and have rejected solvent-based printing inks for their own health and changed to water-based printing inks. The neighbors of the screen printing factory will call the environmental protection department as soon as they have a little odor. For orders received from export traders such as toys, clothing, furniture, curtains, etc., it is often indicated that non-toxic printing inks are used for processing; In shirts, you also learn to touch with your hands to see if they are printed with water-based printing inks. Customers should also ask if they are printing with water-based printing inks when subscribing. Another reason is that all screen printing can be processed by computer before printing. From design, text, pattern, combination to four-color film output, express items can be delivered within one hour, screen-making (four-color version) is picked up on the day, high-performance four-color screen printing machine, high-performance infrared instant dryer are available The supply creates conditions for the use of water-based printing inks.
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