Introduction of UV inkjet technology and product features

UV inkjet printing is a new technology developed at the end of the 20th century. It combines the advantages of inkjet printing technology and ultraviolet curing technology. It has both the convenience of inkjet printing technology in use and operation, and light curing technology. Advantages in efficiency and physical properties. With the continuous development of computers, network technology and printing equipment, UV inkjet printing technology is also constantly updated and perfected. The printing industry is facing a technological revolution from traditional printing methods to modern digital printing methods. Get unprecedented development.

Inkjet digital printing is a pressureless printing method that does not need to output film and make a printing plate. It uses computer graphic information to control the piezoelectric crystal, so that the ink in the nozzle is ejected from the very fine nozzle under a certain pressure , Sprayed on the printing material to form graphic information.

The composition of UV inkjet ink is similar to traditional UV ink, mainly composed of pigment, prepolymer, diluting monomer, photoinitiator and other additives. Traditional inkjet ink is generally divided into water-based ink, oil-based ink and solvent ink. Compared with traditional inkjet, UV inkjet has the following advantages:

1. The solvent content of traditional solvent-based inks is as high as about 90%, and a large amount of VOC emissions have an adverse impact on the environment. UV inkjet ink is a green, non-toxic, non-VOC (volatile organic compound) ink, low energy requirements, the printing process is more environmentally friendly, reducing the exposure of operators to harmful pollutants.

2. It can be cured instantaneously and has high production efficiency.

3. UV curing ink will not dry and solidify at the inkjet head, will not block the nozzle, and effectively reduce the cleaning work of the nozzle.

4. UV inkjet printing can be carried out on a variety of substrates, such as flexible, rigid, absorbable or non-absorbent materials, the substrate selection is wider.

5. UV inkjet can realize the printing of high-resolution and high-definition images, with bright colors, waterproof and fade-proof characteristics, and better friction resistance, scratch resistance and chemical resistance.

In order to obtain high-quality prints, UV inkjet inks need to have good printing performance, mainly need to have the following performance requirements.

Viscosity

Generally speaking, the viscosity of UV inkjet ink is low, it can be ejected smoothly, but for printing effect, the viscosity can not be unlimitedly low, usually the viscosity range is 3 ~ 50mPa · s.

Curing speed

Faster curing speed can improve the gloss and vividness of the image and get a high-quality presentation. If the curing speed is slow, it will be necessary to increase the exposure energy or extend the curing time, thereby affecting the printing efficiency.

Surface Tension

The surface tension of UV inkjet ink needs to be lower than that of the substrate, however, too low surface tension will also cause unstable droplet size during the ejection process, affecting the image quality.

Decentralized

The dispersion of the pigment is an important physical property index, which not only affects the apparent properties, such as chroma and hiding power, but also has a certain influence on the viscosity of the ink and the stability of the system.

Thermal stability

The temperature of the nozzle of the inkjet printing equipment will increase to 40 ~ 50 degrees Celsius during operation, so the heat stability of the ink system has higher requirements.

Toughness and adhesion

When printing images on flexible substrates such as plastic films, adhesion and toughness are necessary physical properties.

Conductivity

In order to meet the needs of electronic control of equipment, UV inkjet needs to have a certain conductivity.

Color density

It reflects the color reproducibility of UV inkjet ink and is an important indicator to determine the printing quality.

As one of the fastest-growing technologies in the UV technology field, UV inkjet printing has made remarkable achievements in recent years. Its output value has increased from US $ 3.9 billion in 2008 to US $ 6.7 billion in 2012, and is expected to grow in 2018 To $ 15.9 billion. At present, the most widely used field is large-format printing, especially outdoor advertising and road banners are very suitable for the use of UV platform inkjet printing technology. In addition, UV inkjet technology has also been rapidly promoted in the fields of label packaging printing and decoration industrial printing.

At present, many domestic inkjet ink manufacturers have begun research and product development in the field of UV inkjet ink, and have mastered a lot of data and experience in formula ratio and performance adjustment. However, because many domestic UV resins and monomers cannot fully meet the requirements of UV inkjet production, the raw material selection range is narrow when designing UV inkjet ink formulations. Therefore, the inks used by many printing companies still rely on imports.

Runao Chemical has specially developed two low-viscosity special acrylate monomers and hyperbranched acrylate resins according to the requirements of the UV inkjet printing market. Acrylic monomer FSP92916 has excellent curing rate, adhesion and thermal stability, while FSP98342 has excellent pigment wetting and flexibility.

Hyperbranched acrylate FSP87398 has the characteristics of low viscosity and low shrinkage due to its compact spherical structure, which reduces the entanglement of chains. The high concentration of acrylate double bonds makes it have very good reactivity and cross-linking density, providing the necessary scratch resistance and chemical resistance. At the same time, the molecular weight of FSP87398 is large, so that it has good pigment dispersion and meets the requirements of high-quality printing.

With the increasing awareness of environmental protection in the world and the continuous advancement of digital printing technology, UV inkjet printing technology will surely gain greater development, will open up more new markets, and move towards newer fields. The growth potential is incalculable.

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