What's the difference between ordinary printing and UV printing?

Compared with traditional ink printing, UV printing does have great advantages, and the differences are as follows:

1. Price:

Although UV ink has the advantages of instant curing and good conjunctival performance, it is relatively expensive. At the same time, special UV blanket and UV ink roller must be used, which greatly increases the product cost.

2. Adhesion:

During the curing process of UV ink, the internal components are crosslinked and polymerized, and the instantaneous change of volume produces great internal stress, which affects the adhesion of ink to printing materials. Although this problem can be improved by surface treatment or modification of the substrate, the fundamental solution is to seek and develop UV ink with good adsorption, low shrinkage stress and low price.

3. The fountain solution suitable for 3. UV printing ink

UV ink is mainly used for non-absorbent printing materials, and the preparation of ink is different for different printing materials. Therefore, the fountain solution is required to have wide adaptability to ensure the required printing quality.

Extended data:

Four printing methods:

typographic/letterpress printing

There are more words, fewer photos and pictures, more opportunities to change words, and fewer prints-hundreds of thousands of prints are suitable for letterpress printing. The printing times of type shall not exceed 30,000 times, and the electronic version of fine drawings shall not exceed 70,000 or 80,000 times. In order to get the perfect dot, coated paper must be selected for printing pictures. So you can't print pictures on cheap paper, hoping to get beautiful results. When the relief flat cable is used, the connection of the line is easy to separate and disconnect, which is a common disadvantage. In addition, when printing, the printing pressure is too high or the surface of the cylinder is too soft, which will make the embossed protrusions appear on the back of the finished printed page, which will greatly reduce the quality of printed matter.

offset printing/lithography

The biggest difference between offset printing and relief printing is that the screen picture printed by relief printing must use paper with smooth surface, but offset printing does not need this, as long as the paper is not too rough. Screen printing is softer than relief printing and it is easy to print dots. Resin plate or nylon plate is another plate that is more wear-resistant than the above plates, and the printing number can reach one million, which can be said to be the longest-lived plate. However, the use of this printing plate is slightly different from ordinary offset printing, that is, there is no wetting system, so it is named "dry offset printing". Generally speaking, the more pictures in printed matter, the larger the picture area, which is more suitable for offset printing instead of letterpress printing. As mentioned above, the effect of printing pictures with offset printing is better than that of letterpress printing, so offset printing is used instead of letterpress printing for general color printing and four-color printing.

intaglio printing

Gravure printing is suitable for printing high-quality and expensive publications. Gravure printing can be very attractive as a photographic photo, whether it is a four-color or black-and-white picture. Because of the high cost of plate making and large print run, it is the least used one of the five kinds of printing in Hong Kong.

silk-screen printing

Because silk-screen printing ink is particularly thick, it is most suitable for printing parts with special effects, especially for parts with small amount and strong ink color. It can also be printed in three dimensions, such as square boxes, boxes, round bottles and cans. Besides paper, the printing base can also be used for printing cloth, paper clips, plywood, plastic sheets, metal sheets, glass and so on. , so it is often used to print banners, T-shirts, ceramic tile boxes, soda bottles, circuit boards, etc. All the above printing features are beyond the reach of other printing methods.

References:

Baidu encyclopedia -UV printing