How to achieve the local glazing of BOPP synthetic label paper?

To achieve the local glazing of BOPP synthetic label paper, it can be mainly achieved in the following ways:

First, local glazing process overview

Local light refers to the selective glazing of specific parts of the print to achieve a sharp contrast with the surrounding parts, enhancing the visual effect and three-dimensional sense of the print. Local glazing on the BOPP synthetic label paper can improve the texture, attractiveness and anti-counterfeiting performance of the label.

Second, the specific implementation method

1. Offset UV local glazing

Principle: The use of UV gloss on the offset press on the print part of the glazing. Due to the advantages of high overprinting accuracy, offset printing is quite popular in local UV glazing.

Operation: The production of local UV glazing plate can be done in two ways: first, the rubber cloth that does not need to be polished is excavated with a blade, and the rubber cloth that needs to be polished is retained; The second is to paste the local UV glazing resin plate made of resin plate on the rubber blanket, and achieve local glazing by coating UV glazing oil and transferring it to the print surface.

Advantages: thin glazing layer, fast glazing speed, low unit cost.

2. Screen printing UV local glazing

Principle: The method of screen printing is used to print UV gloss on a pattern on the original color print. The ink layer of screen printing is thick, strong three-dimensional sense, and the local glazing effect is superior to other processes.

Operation: Select the appropriate screen plate (generally choose 200 ~ 300 mesh screen), adjust the tension of the mesh (20 ~ 25N/cm), and print the UV varnish through the screen plate to the part that needs to be polished.

Advantages: High ink transfer, scratch resistance, folding resistance, local glazing effect is significant.

3. Flexographic UV local glazing

Principle: Flexographic printing glazing can form a thicker coating, with the mesh roller and cavity scraper, can accurately control the amount of light oil, to achieve stable glazing quality.

Operation: Install the flexographic plate on the printing press, adjust the coating amount of polishing oil and printing pressure, and perform local glazing treatment on the BOPP synthetic label paper.

Advantages: Simple process, uniform coating, suitable for off-line and online production.

4. Intaglio UV local glazing

Principle: The cylinder of gravure printing has high printing resistance and thick printing ink layer, which is very suitable for local UV glazing-in.

Operation: Use the intaglio press to perform local glazing-processing on the BOPP synthetic label paper, and transfer the UV varnish to the part that needs glazing-through the intaglio drum.

Advantages: thick ink layer, high gloss, but higher plate making costs, mainly used for long plate glazing business.

5. Inkjet UV local glazing

Principle: UV glazing oil is directly sprayed on the printed text that needs glazing by digital inkjet, and then the film is dried by ultraviolet radiation.

Operation: Use inkjet UV glazing equipment to locally spray BOPP synthetic label paper, and achieve local glazing by precisely controlling the nozzle and ultraviolet irradiation.

Advantages: there is no need for plate making and loading time, and the variability of printed graphics is strong, but the glazing-speed is slow and the inkjet UV glazing-oil is expensive.

Third, precautions

Choose the right UV curing light source: UV curing light source has an important impact on the curing speed and effect of UV glazing oil, should be based on the characteristics of the printed paper, the characteristics of the glazing oil, the area and thickness of the glazing pattern to choose the right curing light source and light intensity.

Control the amount of glazing oil coating: the amount of glazing oil coating has an impact on the leveling, thickness, smoothness, gloss, curing performance, etc., and should be properly controlled to ensure the glazing effect.

Ensure the drying of the printed matter: Before local glazing, ensure that the ink on the surface of the printed matter has been completely dried or cured to avoid incomplete curing of the glossy oil or other quality problems.

In the above way, local glazing can be achieved on the BOPP synthetic label paper to improve the visual effect and added value of the label.