News Center

Company News

About the anilox roller,the knowledge you may not know!

The anilox roll is called the "heart of the printing press" and its effect directly affects the fineness and uniformity of the print. This article will comb the basic knowledge of anilox roller, and the basic indicators of the anilox roller for the procurement index and daily maintenance skills of the anilox roller, and elaborate on the procurement index and daily maintenance skills of the anilox roller. JCTPRINT helps you understand the anilox roller and master the core of the printing press faster.

1The functions of the anilox roller

1. Uniform and stable ink transfer, using the concave hole carrier on the surface to transfer and control the ink, thus having the functions of ink storage, ink distribution and ink transfer.

2, to avoid the ink bar, because the anilox roller processing precision is very high, even in the light pressure state, can transfer ink well, thereby reducing and avoiding the production of ink bars and ghosts.

3, improve the speed of the car, due to the use of anilox roller, effectively overcome the phenomenon of "flying ink", played a vital role in improving the speed of the printing press.

2 The principle of ink transfer of the anilox roller

3The composition of the anilox roller

The composition mechanism of the anilox roll is generally divided into two types: a nickel-plated ceramic anilox roll and an ordinary ceramic anilox roll. The difference between the two is shown in the following figure:

结构图750.png

4 How to choose anilox roller? Which parameters are important?

For high quality presses, laser engraved rolls with a clear number of screens and a large area of smooth ink film are the best choice. Computerized measurements of cell volume, structure and alignment angles ensure that anilox roll suppliers are able to more accurately predict the printing capabilities of the device.

However, the final choice of anilox roller must be based on actual needs. In the most basic form of the roll, there are four types of screens to choose from: full version of the field, solid and lines, thin lines and fonts, and four-color printing. Obviously, the final printed product is a combination of the above types, and when it is subdivided into individual colors, it can be classified into the above categories, and their printing effects may have some differences.

The number of lines is the most important part of the anilox roller, which refers to the number of cells in the same unit length along the direction of the anilox roller.

The number of screen lines can be roughly divided into the following types according to the type of printing: 100 lines/inch, 250 lines/inch or less (full points printing in large area), 200 lines/inch to 300 lines/inch (Full points printing and text lines), 400 lines/ Inches ~ 1000 lines / inch (including above) (four-color printing).

Plates can use a variety of screen lines, so the four-color printing process has a variety of cable options.JCTPRINT The simplest truth is that the smaller the plate network, the smaller the number of roller lines.

Similarly, the amount of ink or coating used is generally based on the following criteria: To a large extent, the depth of the wire is first determined, ie the theoretical volume of the particular cell shape is calculated. The anilox roll supplier must understand the wet and dry weight of the ink, as well as its solids content, in order to provide customers with better recommendations for use.

The main arrangement of ceramic anilox roll cells

The main arrangement of ceramic anilox roll cells is mainly the direction in which the mesh lines are arranged, and the angle formed by the direction of the strike, which is formed into a degree of 30°, 45°, 60°. The ceramic anilox rolls used in general flexographic printing presses are usually arranged in a 60° arrangement, and the cells are in a regular hexagon.

In this case, the cells are relatively compact, and the cells are nearly 15% more than other arrangements. More holes of the same size can be engraved on the surface of the same area of the web roller, then more ink can be transferred, and the excess position between the cells can be eliminated to the utmost extent, under the condition of delivering the same amount of ink. The hole can be made shallower and can make full use of the ink transfer. In addition, the 60° cell is easier to engrave, and the 60° line array of anilox rolls is more stable.

If the cell structure is 90 degrees, the ink will grow in a strip shape; if it is 120 degrees, the structure will be more square. If you use a 60-degree mesh, the ink transfer will be better, and the print pressure will be smaller and the water flow marks will be less, as shown.

Ceramic laser engraving anilox roller

As market competition becomes more intense, high-quality printing and uniform printing density become industry standards, many carton manufacturers are beginning to realize that traditional anilox rolls do not meet their production printing requirements. JCTPRINT The market began to look for more wear-resistant coating rolls, and ceramic laser-engraved anilox rolls came into being. It not only overcomes the wear problem, but also provides a large number of screen lines, cell depth and arrangement angle for the printing press.

Since the "single beam" laser is a non-contact engraving process, the shape of the cell is similar to a disk shape or a hemispherical shape. The application of traditional computer technology means that the laser can perform more than one shot on a single cell. JCTPRINT This process is done by using "double beam" or "double click". This way is a great improvement for the engraving process. The ratio of the number of mesh lines to the plate is increased from 3:1 to 4:1, 5:1. even more. This will give you more open and useful cell counts, especially if the number of cells is large (usually when using high pigment "enhanced inks").

Because the width-to-depth ratio is different, the amount of ink is different, so there is a big difference in the transfer and cleaning of the ink. If the aspect ratio is greater than 33%, cleaning is difficult; if the width and depth are small, then the ink is less, printing is less. The vividness and layering will be very poor.

At present, cardboard carton factories generally purchase anilox rolls according to different product conditions. Common anilox rolls include steel rolls, ceramic rolls and high-wafer anilox rolls. Customers should also purchase according to actual conditions.

Anilox roller type	Advantages	Disadvantage
Steel anilox roller	1, the price is cheap 2, suitable for printing ordinary text, lines	1, the number of network lines can not exceed 180 lines 2, low surface hardness, fast wear, high maintenance frequency 3, the cell hole ink absorption is poor, the printing effect is poor
Ceramic anilox roller	1. The ceramic layer has good chemical stability, good corrosion resistance on the roll surface and long service life. 2. The cell has good ink absorption and good printing effect, and can be printed with high screen line, up to 400 mesh. 3, honeycomb-shaped network arrangement, good tone reproduction	1.High price 2.Not easy to repair, high maintenance requirements

5.The daily maintenance skills of the anilox roller

Of course, after buying the appropriate anilox roller, you have to understand the daily maintenance skills of the anilox roller. JCTPRINT This will make your printing process easier.

1, Pay attention to details JCTPRINT

(1) Keep the equipment clean and clean

(2) Use clean water-based ink

(3) Guarantee the clean cloth

(4) Pay attention to the quality of the base paper

(5) It is strictly forbidden to scrape, bump or hit the anilox roller.

2, do the cleaning work of the anilox roller

Daily cleaning

1 Have enough cleaning time

2 Clean with a copper brush (metal anilox roller) or a steel brush (ceramic anilox roller)

3 Wash with washing machine water or special anilox roller cleaning solution.