Currently, there are many types of printing technology to choose from with their own advantages and disadvantages. Flexo printing technology (roll flexo printing) is increasingly proving its position in the printing industry. Being applied in many large printing factories, allowing printing on many materials of paper, plastic, silver, etc., Flexographic printing technology ensures good print quality and saves costs. In this article, EPP will share with you the flexographic printing process on jumbo bags.
What are the stages of flexographic printing on jumbo bags?
If you need to print in large quantities at a low price without excellent print quality, you should choose Flexo printing technology. The reason is that the printing speed of Flexo printers is faster than offset printing and UV printing.
Flexo printing technology (roll flexo printing) is increasingly proving its position in the printing industry
The fast printing speed is partly due to the fact that Flexo printing is direct printing, the ink is printed from the mold onto the paper, not through the offset printing plate. Offset printing: During the offset printing process, inked images will be transferred from the printing mold through the offset plate (rubber blanket) onto the fabric. With such an indirect way, the ink is not smudged and the quality is uniform. This modern printing technology is carried out through the following steps.
Before printing
- Design Print file: At this stage, print files will be designed on software to produce the final output film in pdf format. When coming to EPP, our staff will help you design the print files as your requirements.
- Making Output film: In this step, we will use CTF (Computer to Film) technology in which digital data from the computer is converted into analog data (analog) on conventional film through film recorders. For print versions with photos, the film will be out in four panels representing four layers of color C (Cyan), M (Magenta), Y (Yellow), K (Black). This film will be in black and white.
- Drying the printing mold: After the film is released, these films will be put into the zinc machine to dry the zinc. At this time, the printed elements will be corroded under the photochemical action. The unprinted part will be retained because light cannot penetrate the film.
- Mounting shaft: Mount the print die on the printer's rotating shaft.
During Flexo printing
Flexo printers work in a circular form, the printed material passes through the color stations, in turn, thanks to the movement of the transfer rollers (rollers). Each color station is a separate color and is fitted with a separate die. When passing through a color station, the printed image will appear on the surface with the corresponding color.
Flexo printing can print multiple colors at once with unlimited quantity
Thus, Flexo printing can print multiple colors at once with unlimited quantity. In fact, Flexo printing machines have from 2 to 8 colors, many color stations. At each color station, the printing process takes place as follows:
- The printing color is transferred from the ink tray by the rotation of the spindle.
- After that, the ink is transferred to the anilox cylinder. At this surface, there are tiny cells to store ink. Ink will be filled in these cells and the excess is removed by the ink knife.
- Next, the color on the anilox cylinder is pressed to the embossed positions of the printing mold.
- Finally, the printing mold is pressed onto the surface of the printing material to form a complete printing process thanks to the pressure of the printing press tubes.
After flexographic printing
Flexographic printing machines can pre-assemble cutting, laminating, or other printing parts on the machine. Users can install additional parts to finish the printing process. After printing, the large roll is put into the cutter to separate into small pieces of labels. On the other hand, flexographic prints can also be transferred onto die machines or other converting devices that convert rolls of printed material into corrugated cartons, corrugated boxes, sealable bags, and other forms of packaging. In addition, to keep the print long-lasting users can request the printing factory to laminate (add a thin layer of PE film) on the surface of the printing material.
Flexographic printing machines can pre-assemble cutting, laminating, or other printing parts on the machine
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