Explore one of the elements that affect the transfer of ink on the anilox roller

With the development of science and technology, the way of transferring ink to the flexographic printing equipment is also constantly improving and improving. From the initial development of metallic light rolls and metal anilox rolls to today's ceramic anilox rolls, the quality of flexographic printing continues to increase. . However, currently, manufacturers of ceramic anilox rollers cannot yet achieve uniform data and uniform ink transfer volume, resulting in different ink transfer rates for the same anilox roller lines (as indicated by BCM, which is the standard for ink transfer in the United States and the United States. , Europe uses cm3/m2, its conversion method is 1BCM=1.55cm3/m2) or the amount of ink transfer of different anilox roller lines is the same, resulting in confusion in use. This article explores the factors that affect the amount of ink transferred by the anilox roller in order to seek the relationship between these elements and the amount of ink delivered, so that everyone can use the anilox roller with ease.

The elements of anilox roller transfer ink are the following: the number of anilox roller lines, ratio of opening to wall to wall, volume of net pocket, depth of net pocket, surface finish of net pocket, speed of anilox roller operation, angle of netting line, and shape of net pocket Wait.

Anilox roller number

The number of anilox roller lines is the distribution of the network holes in a unit length. The number of lines should be understood as both openings and mesh walls. Through it, you can also calculate the amount of distribution of net holes in a unit area. In this context, unit length refers to every inch and unit area refers to every square inch. For example, 200 lines/inch (80 lines/cm), that is, 200 network lines per inch of length, or 40,000 holes per square inch of area. Since the unit area is the same and the number of network points is different, there are points in the size of the cells. Large amounts of ink are stored, and the amount of ink transferred is also large; otherwise, the amount of ink transferred is small. Therefore, the amount of ink transferred by the high number of anilox rolls is smaller than the amount of ink transmitted by the low number of anilox rolls.

At present, there is a tendency for the number of anilox roller lines to increase on the market. The specific performance is as follows:

(1) The equipment with high number of anilox roller lines is of good quality.

(2) Pay more attention to configuring anilox rollers with a high number of lines when purchasing a machine.

(3) Anilox rolls are machined to 1200 lines/inch or even higher to exaggerate the quality of the anilox roll.

(4) The corrugated box printing slot machine uses ceramic anilox rollers with 350 lines/inch or even higher lines.

Some organizations have conducted exploration experiments and used 1000 lines/inch anilox rollers to transfer ink. As a result, the density value of solid ink on the prints did not meet the “national standard” requirement. This indicates that the number of anilox roller lines should be selected reasonably. The higher the better. The number of lines of the anilox roller only represents the amount of ink. It is wrong to measure the quality and printing performance of the anilox roller with the number of anilox roller lines.

The different number of lines of the anilox roller gives flexibility to the flexo printers to control the ink volume, and also creates the conditions for printing high-quality, high-line-count products. Before the 1980s, the metal anilox roll could only be processed to 300 lines/inch, so the maximum can only print 120 lines/inch of screened products, after which it can print 175 lines/inch of printed products, ceramic anilox roller can not be No.

So how much is the number of ceramic anilox roller lines? The current selection of anilox roller lines, in addition to conventional considerations of printing materials, text, image quality and ink and other factors, it should be emphasized that all units should be in practice Reasonable choice, good at adjusting, and strengthening communication. In the future, with the increase of the quality of the anilox roller (ie, the amount of ink stored in the cells), the number of anilox roller lines will be appropriately increased. However, the current 1000 lines/inch or more anilox roller should be used with caution.

In addition, it is also recognized that the ink transfer system of the flexographic printing press cannot adjust the amount of ink on a single anilox roller, but adjusts the ink volume by changing the number of different lines of the anilox roller. Advanced corrugated carton flexographic printing slotting machine, each color group is equipped with 3 different number of lines of the anilox roller, the purpose is to allow the operator to have room to adjust the amount of ink.