Flexographic printing machine principle|Flexographic printing machine advantages and disadvantages|Flexographic printing technology


Published on:

2019-01-03

Abstract: Flexographic printing press belongs to the letterpress printing method, flexographic printing presses use fluid ink with high fluidity, ink from the ink hopper rubber roller and anilox ink transfer roller to the graphic part of the printing plate and make it inked, and then by the pressure cylinder to apply printing pressure, the ink on the printing plate is transferred to the substrate, and finally completed by the drying surface. The following, to understand the principle of flexographic printing machine, flexographic printing technology, flexographic printing machine maintenance knowledge. 【Flexographic printing machine】 Flexographic printing machine principle Flexographic printing machine advantages and disadvantages Flexographic printing technology Flexographic printing machine principle Ink in the ink hopper, under the action of the anilox rollers in the flexographic printing parts, anilox rollers mesh cavities and anilox

Flexographic printing machine principle|Flexographic printing machine advantages and disadvantages|Flexographic printing technology
Abstract: Flexographic printing press belongs to the letterpress printing method, flexographic printing presses use fluid ink with high fluidity, ink from the ink hopper rubber roller and anilox ink transfer roller to the graphic part of the printing plate and make it inked, and then by the pressure cylinder to apply printing pressure, the ink on the printing plate is transferred to the substrate, and finally completed by the drying surface. The following, to understand the principle of flexographic printing machine, flexographic printing technology, flexographic printing machine maintenance knowledge.

【Flexographic printing machine】Flexographic printing machine principle Flexographic printing machine advantages and disadvantages Flexographic printing technology

Flexographic printing machine principle

The ink in the ink hopper is carried on the surface of both the anilox roller cavity and the anilox roller by the action of the anilox roller in the flexographic printing part.

The ink on the surface of the anilox roller is scraped off by the action of the squeegee, so that the ink is present only in the anilox roller cavity.

The ink in the cavity is transferred to the flexible printing plate under pressure.

Finally, the ink on the printing plate is transferred to the substrate under the action of printing pressure.

Flexographic printing machine advantages and disadvantages

1、Benefits Analysis

A. Simple equipment structure, easy to operate and maintain work.

B、Strong processing capacity in line, short production cycle and high working efficiency.

C. New water-based ink and solvent-based ink are used, non-toxic and non-polluting, which fully meet the requirements of green environment and also meet the requirements of food packaging. It is generally suitable for small or medium batch products.

D. Wide application of materials, adaptable to various materials, such as cartons, paper, transparent film, etc. are applicable.

E. Good quality of flexographic printing products, printing accuracy can reach 150 lines / inch, and the print is rich in layers, vivid colors, good visual effects, especially suitable for packaging printing requirements.

2、Disadvantage Analysis

A, each unit spacing of printing is relatively short, which easily leads to the ink getting dusty and dirty spots on the pattern.

B、The price of flexographic printing machine is high, and the number of color groups is limited by the size of the center press cylinder, and each color group is arranged at different angles, which makes the printing of each color group more difficult.

C. Although the other side can be printed through the guide roller, but because the machine body is long, the material to be easily deformed and become uneven, there is no way to achieve two-sided printing, so only single-sided printing.

Flexographic printing technology

Printing technology, is slowly shifting from traditional analog printing to digital printing, and flexo printing is no exception. With the improvement of flexo printing technology, flexo plate making technology has also transformed from analog to digital.

Traditional flexo direct plate making technology:

Process flow: (generally using photopolymer plates)

1, back exposure: through a short period of exposure to establish the basis for the relief of the printing plate;

2, main exposure: the main exposure with the original negative, the negative on the graphic dwelling transferred to the plate, the plate's photopolymerization reaction by UV light photopolymerization and curing;

3, rinsing: remove the resin at the unexposed, the formation of printed relief graphics;

4, drying: hot air drying, the plate absorbed in the solvent discharge, restore the original thickness of the plate;

5, de-stick: to remove the stickiness of the plate surface;

6, post-exposure: so that the plate undergoes a thorough polymerization reaction, so that the layout is fully hardened, up to the required hardness .

Digital Direct-to-Plate Technology:

The process is briefly described as flow:

1. Imaging: Placing the plate in a CDI (Cyrel Digital Imager) and transferring the graphic information to the plate by laser;

2, main exposure: after laser imaging the plate is removed from the CDI and placed in a conventional exposure machine for main exposure; like conventional plate making technology, digital direct plate making technology is also completely subject to processing, drying, debonding and post-exposure.

The CDI is an external cylinder reservoir that works with the infrared light output from the laser to image the black surface layer. Controlled by a computer, the laser inside the CDI only ablates the black layer to expose the photopolymer, without acting on the photopolymer layer below, creating the conditions for exposure.

As can be seen, the process is the same as traditional platemaking, except for the plate material used and the digital imaging, which is different from traditional platemaking. But it is also these two points that make the digital direct plate making technology, with the traditional plate making can not replicate the technical advantages: the

1、In digital direct plate making technology, the black material on the plate replaces the film, eliminating the problem of dot enlargement caused on the film in the dot reduction process;

2, to avoid the poor contact between the film and the plate in the exposure process, and the vacuum leakage caused by the phenomenon;

3, the traditional plate-making process, exposure time is determined by the type of graphics, in the formal exposure before the need to test to determine the exposure time. digital plate making, exposure time is independent of the type of graphics and dot density;

4, in the exposure, the role of the film will be formed due to the diffuse scattering effect of UV light, so that all the graphics, dots have increased, etc.

Laser, since its application in the printing plate technology has greatly improved the quality of printing, but also simplifies the process. With the increasing maturity and promotion of flexo digital direct plate making technology, we have reason to believe that "CDI" will also be sought after one day.