What is the concept of flexo printing? Operating principle flexo printer

We have heard of flexo printing technology. So what is the concept of flexo? Today's article will help you learn and answer this question.

Flexo printing, also known as flexography, is a printing technology where printed elements (images, text, etc.) are more prominent than non-printing parts. The images put on the mold must be opposite to the anilox axis, which is responsible for supplying ink after the process of pressing and transferring ink directly onto the printing materials.

In order to understand Flexo printing technology, we need to understand the operating principle of anilox shafts. The surface of anilox shaft is a metal plate with a concave plate engraved with many small boxes to help ink into the mold quickly. When the ink enters, the crane will dip into the ink trough, the ink will follow the concave carved patterns to go inside and the excess ink will be removed by the ink brush.

The printing die (made by photopolymer, photo-printed photo-printing copy, CTP-directly from computer or laser engraving) will contact the printing axis directly and receive ink from the surface of the shaft then transfer ink to the surface. face print material. Images and scripts after printing will be opposite to the original print axis.

The choice of printing die (thickness, hardness, number of layers) depends on the media (paper, carton or film). In flexographic printing, there is also an issue of choosing the appropriate tram angle to avoid moire phenomenon 'due to the interaction with the tram angle and the frequency of the anilox axis.

Ink stuck: due to pressure and temperature changes

 The ink is smudged on the side: Streaks appear around the edge due to inappropriate ink usage

 Due to air bubbles, there is an irregular pumping system

 The toner is speckled by the irregular ink supply with spots or stripes on the print

 The ink is overflowing, the print element is distorted: due to excess ink on the edge

 Printing ink is poor due to weak adhesion of ink

 Print ink lost detail due to poor transfer, poor adhesion

Lem ink due to the color printing after pressing too hard on the previous printing color and the first color could not dry.

Because flexo printing has been around for a long time, it still has many limitations compared to digital or offset printing techniques. But in terms of performance, they still have many advantages that should be trusted by many people.

 

Typically Flexo will produce product quality when printing evenly. Flexo printing technology is widely used and has a lot of development potential thanks to the advantage of meeting large production schedules, fast printing capacity, and printing on roll materials for lines. automatic gluing machine.

Flexo printing technology is also associated with automatic closing machines, adding right after the printing process, making the increasing capacity saving costs and time.

Flexo printing method is an appropriate choice for printing labels, stickers, stamps, labels, labels, packaging, cartons and printing on many special materials such as fabric, paperboard or printed on polymer film ...

Above are some principles and techniques of flexo printing technology. Hopefully the article will help you understand the printing technology, make the right decision and appropriate purchase of packaging printing machinery and equipment.