Recently, the printing industry has begun to use non-paper substrates for printing, which can ensure that the printed matter shows a special printing effect. Of course, this is a special printing set for use in a special environment. There are many types of these printing technologies, and today I will show you the relevant content.    

1. Ultraviolet (UV) printing 

This is a printing method that irradiates the ink with ultraviolet rays to make it dry. The ink used is an ultraviolet drying ink. This kind of ink hardens instantly when irradiated by ultraviolet rays, and the ink film is strong. Therefore, for the printing of paper packaging equipment using cheap thick paper backing lining, non-ink-absorbing synthetic paper, fast-drying printing, plastic Printing, business form printing and metal printing requiring a harder ink film layer are more suitable for printing processes. The disadvantage is that the special solvent in the UV ink will swell the printing plate and the roller. Therefore, special equipment must be used. The ink is expensive and has poor preservation, which is also its disadvantage.

2. Spice printing

This type of printing is mostly used in cosmetics advertising, because adding appropriate fragrance to the pattern will increase the added value of the printed matter. This perfume ink is made by directly dissolving perfume in the ink. Its appearance is similar to ordinary ink, but its cheap fragrance effect lasts for a long time. The fragrance of the ink is encapsulated in microcapsules and mixed into it. When the printed matter is used, the microcapsules are broken by hands or other forms, causing the fragrance to slowly overflow and emit fragrance.

3. Fluorescence and phosphorescent printing

After the ink absorbs ultraviolet light, it causes the wavelength to change after receiving visible light and reflects fluorescence. Printing with this ink is called fluorescent printing. After the ink is exposed to light, the light energy can be stored in the dark place. Printing with this ink is called luminous printing. The visual effects of these two printed products are better. Therefore, propaganda posters and covers are printed with techniques such as Dachuan.

However, fluorescent pigments and light-storing pigments are expensive, and their inks have poor printability. To increase color and visual effects, the ink layer must be thickened. Generally speaking, this type of ink has poor light resistance, and attention must be paid to the environmental issues of using this type of printed matter. In addition, to further improve the visual effect of printed matter, it is necessary to use its pearlescent ink (pearlescent ink) for pearlescent printing.

4. Uplift printing

This printing process is mainly used for printing such as braille and embossing. The printing patterns are all or partly raised, which has visual and sensory effects. When printing, use a foaming agent that will raise the printed pattern. After heating, the foaming agent expands to make the pattern raised (foam printing). You can also sprinkle resin powder on the pattern part of the printed product, and then It is heated and melted, and after it is adhered to the pattern, it is cooled and solidified to form a relief, and the relief is formed by embossing on the back of the printed matter.

Usually, foam printing and stamping printing are cheap, but the amount of pattern protrusion is small, and the durability is low. Although the resin powder printing process can overcome the above shortcomings, the process is complicated and expensive. The appropriate method should be selected according to the purpose of use,

5. OCR (optical character recognition device), OMR (optical mark recognition device) printing

Recently, it has begun to process bills such as transfer checks and subpoenas through the computer OCR and OMR. When using these devices, there are two ways to recognize plain text and print text. The written frame is usually printed with ordinary ink. However, misunderstandings may occur when reading, but people can recognize the printing method using ink (printing ink color) that the device cannot recognize. Since the colors that can be used are limited to the sensitive area of ​​the OCR device used, great attention should be paid to color selection. In addition, due to the change in the color of the printing ink every day of the printing, the dirty printing paper will cause misunderstandings, and special management must be strengthened.

6. High-precision, magnetic screen printing

In the existing flat printing dot resolution is mainly 175L, increasing the resolution to more than 300L is called high-definition printing. The magnetic screen printing is to design the dots into very fine regular dots, without the distinction of size. Through this increase or decrease in the number of dots to achieve color restoration.

Due to the enhanced digital reduction ability of the fine parts of the needle tip in high-precision printing, the regular overlapping of the dots of each color will not appear, thus eliminating the trouble of correction. High-definition magnetic screen printing achieves the same effect as expected, but due to the extremely small dots, the technical requirements for the plate-making printing process are extremely high.

7. High sensitivity printing (6-7 colors)

Usually, printing is performed by the three primary colors (magenta, cyan, and yellow) plus black for a subtractive four-color printing process. Green is a superposition of cyan and yellow. However, in actual printing, because the first printed ink (such as cyan) is not dry, the next color (such as yellow) is superimposed on it, so the ink cannot It is completely transferred to the bottom color (bad superposition), so it is difficult to restore a bright green.

In addition, in order to expand the range of color reproduction, on the basis of the four-color printing process, three colors of red, green and blue are added to become seven-color printing. In addition, on the basis of the four-color printing process, two colors of orange and green are added to become six-color printing. Attention should be paid when carrying out this printing process, and the dot status of each color must be carefully selected. And for careful analysis of 6-7 colors, it is particularly important to select the state of the dots to avoid the occurrence of phenomena such as moiré (such as the use of magnetic screens, etc.).

In addition, high-concentration inks are used to extend the dot tone range for high-concentration printing. In order to take into account that printed materials used outdoors must have super light resistance, super light-resistant inks and ultraviolet absorbing inks are used for super light-resistant printing. There is also the recent consideration of environmental protection issues and the use of non-wood paper, so that the ink made from soybean oil (soy ink, a variety of printing carried out, all these special printing require different levels of chemical processes and technical levels. For this reason, the first step is to use It is necessary to understand the characteristics and effects of various special printing, the added value of printed matter, the difference in cost, and the difference in quality of patterns to make the right choice.