First, the adjustment of ink supply volume Corrugated carton flexo printing process is:
Corrugated board production → Cardboard → Flexo printing → Die-cutting → Sticky (order) box.
The following focuses on the flexographic printing process. Short ink ink transfer is a prominent feature of flexographic printing presses. Compared with offset printing machines and offset printing machines, the inking system of flexographic printing presses is very simple. Two ink rollers and even an ink roller with a squeegee can achieve even and quantitative ink fountains. Transfer ink.
1. Relationship between the number of anilox roller lines and ink supply The number of anilox roller lines refers to the number of network holes in the unit length along the axial direction of the anilox roller. Commonly used units are: line/inch or line/cm.
(1) Selection of the number of anilox roller lines The relationship between the number of screen lines and the number of anilox roller lines:
Flexo printing screens are generally thicker than the screens used for lithography. The number of screen lines should be controlled within the scope of flexo printing. The number of screens for the flexo version also depends on the dot gain and the media reproduction performance.
At present, the number of screens commonly used for printing corrugated boxes in flexographic printing is 40-80 lines/inch.
The number of screens for flexographic printing and the number of lines for the anilox roller have a matching relationship. The general rule is:
The number of screen lines = 1/3 to 1/4, the number of screen rollers. That is, the number of anilox roller lines is about 3 to 4 times the number of screen printing lines. Corrugated box printing can be relatively low and flexible packaging printing can be higher.
(2) The relation between the number of anilox roller lines and ink supply It has been proved by practice that the finer the texture, the higher the number of lines, the less the amount of stored ink, and the smaller the dot expansion.
In the printing of corrugated boxes, the number of commonly used anilox rollers is mostly between 180 lines/inch and 300 lines/inch, which depends on the fineness of the printed products. Since the vast majority of printed products are both on-site, with lines or dots, or both full-size and small-size fonts, the most ideal solution to meet the requirements of different levels of products is in a set of soft The printer is equipped with different number of anilox rollers to meet the needs of different precision printing products.
However, according to experienced sources, the number of anilox roller lines is currently high, the average product line is 200 lines per inch, and the cable line product is 400 lines per inch. As a result, the amount of ink is not enough, some places are not true, and some are missing. Ink is not eye-catching.
Kraft paper or gray-white paperboards are papers with rough surfaces and large ink-absorbing capacity. If the number of anilox roller lines is too high and poor-quality inks are used, the amount of ink is even less because the corrugated cardboard has a large amount of ink. There are more spot color inks, less stacked ink, and more ink on corrugated cardboard.
150 lines/inch for general products and 200-250 lines/inch for network cable products.
2. The influence of the shape of the cell site on the ink supply The cell site has a helical tooth shape, a pyramid shape, an angular shape, a bowl shape, a test tube shape, etc. from the cross-sectional area; the shape of the hole has a quadrangle, a hexagon, and a diamond shape when viewed from the top. Helix, etc., Anilox rollers with different cell shapes will have different ink loading even if the number of lines is the same. The reason is that the shape of the cells determines the size of the mesh volume, and the larger the volume, the greater the amount of ink carried. Currently widely used laser engraved ceramic anilox roller, more regular hexagon. This is because: In this arrangement, the arrangement of the cells is the most compact. In a given area, the number of cells can be nearly 15% larger than that of other arrangements. Therefore, on the surface of the same area of ​​the anilox roller, more equal-sized cells can be carved and more ink can be transferred.
3. The effect of the arrangement angle of the network points on the ink supply The network arrangement angle refers to the angle between the orientation of the network cells and the axis direction.
There are 30°, 45°, and 60° angles for the network. At present, 45° and 60° are mostly common. The laser-engraved ceramic anilox roll uses more 60° meshes, because the hexagonal shape of the hexagonal cells in the 60° arrangement can eliminate the superfluous position between the meshes. The thinnest wall, under the condition of delivering the same amount of ink, the cell site can be made shallower, which facilitates the transfer of the ink.
The hexagonal 60°-arranged anilox roll has become the industry standard today. With a fine mesh wall and large mesh volume (the difference between the top and the bottom of the mesh is small), it can ensure that the size, shape, depth and depth of the mesh are consistent, and the amount of ink carried is large and uniform. This is very advantageous for the full-printing, colorful, and ink-absorbing substrates, which can achieve the best effect of ink transfer. In addition, it is necessary to properly maintain and timely clean the anilox roller so that the mesh can be kept clean to achieve the desired ink loading and good printing results.
There are also some adjustment methods that are not considered desirable. One is to change the degree of adhesion between the doctor blade and the anilox roller, and the other is to change the degree of compression between the rubber roller and the anilox roller. (To be continued)
Corrugated board production → Cardboard → Flexo printing → Die-cutting → Sticky (order) box.
The following focuses on the flexographic printing process. Short ink ink transfer is a prominent feature of flexographic printing presses. Compared with offset printing machines and offset printing machines, the inking system of flexographic printing presses is very simple. Two ink rollers and even an ink roller with a squeegee can achieve even and quantitative ink fountains. Transfer ink.
1. Relationship between the number of anilox roller lines and ink supply The number of anilox roller lines refers to the number of network holes in the unit length along the axial direction of the anilox roller. Commonly used units are: line/inch or line/cm.
(1) Selection of the number of anilox roller lines The relationship between the number of screen lines and the number of anilox roller lines:
Flexo printing screens are generally thicker than the screens used for lithography. The number of screen lines should be controlled within the scope of flexo printing. The number of screens for the flexo version also depends on the dot gain and the media reproduction performance.
At present, the number of screens commonly used for printing corrugated boxes in flexographic printing is 40-80 lines/inch.
The number of screens for flexographic printing and the number of lines for the anilox roller have a matching relationship. The general rule is:
The number of screen lines = 1/3 to 1/4, the number of screen rollers. That is, the number of anilox roller lines is about 3 to 4 times the number of screen printing lines. Corrugated box printing can be relatively low and flexible packaging printing can be higher.
(2) The relation between the number of anilox roller lines and ink supply It has been proved by practice that the finer the texture, the higher the number of lines, the less the amount of stored ink, and the smaller the dot expansion.
In the printing of corrugated boxes, the number of commonly used anilox rollers is mostly between 180 lines/inch and 300 lines/inch, which depends on the fineness of the printed products. Since the vast majority of printed products are both on-site, with lines or dots, or both full-size and small-size fonts, the most ideal solution to meet the requirements of different levels of products is in a set of soft The printer is equipped with different number of anilox rollers to meet the needs of different precision printing products.
However, according to experienced sources, the number of anilox roller lines is currently high, the average product line is 200 lines per inch, and the cable line product is 400 lines per inch. As a result, the amount of ink is not enough, some places are not true, and some are missing. Ink is not eye-catching.
Kraft paper or gray-white paperboards are papers with rough surfaces and large ink-absorbing capacity. If the number of anilox roller lines is too high and poor-quality inks are used, the amount of ink is even less because the corrugated cardboard has a large amount of ink. There are more spot color inks, less stacked ink, and more ink on corrugated cardboard.
150 lines/inch for general products and 200-250 lines/inch for network cable products.
2. The influence of the shape of the cell site on the ink supply The cell site has a helical tooth shape, a pyramid shape, an angular shape, a bowl shape, a test tube shape, etc. from the cross-sectional area; the shape of the hole has a quadrangle, a hexagon, and a diamond shape when viewed from the top. Helix, etc., Anilox rollers with different cell shapes will have different ink loading even if the number of lines is the same. The reason is that the shape of the cells determines the size of the mesh volume, and the larger the volume, the greater the amount of ink carried. Currently widely used laser engraved ceramic anilox roller, more regular hexagon. This is because: In this arrangement, the arrangement of the cells is the most compact. In a given area, the number of cells can be nearly 15% larger than that of other arrangements. Therefore, on the surface of the same area of ​​the anilox roller, more equal-sized cells can be carved and more ink can be transferred.
3. The effect of the arrangement angle of the network points on the ink supply The network arrangement angle refers to the angle between the orientation of the network cells and the axis direction.
There are 30°, 45°, and 60° angles for the network. At present, 45° and 60° are mostly common. The laser-engraved ceramic anilox roll uses more 60° meshes, because the hexagonal shape of the hexagonal cells in the 60° arrangement can eliminate the superfluous position between the meshes. The thinnest wall, under the condition of delivering the same amount of ink, the cell site can be made shallower, which facilitates the transfer of the ink.
The hexagonal 60°-arranged anilox roll has become the industry standard today. With a fine mesh wall and large mesh volume (the difference between the top and the bottom of the mesh is small), it can ensure that the size, shape, depth and depth of the mesh are consistent, and the amount of ink carried is large and uniform. This is very advantageous for the full-printing, colorful, and ink-absorbing substrates, which can achieve the best effect of ink transfer. In addition, it is necessary to properly maintain and timely clean the anilox roller so that the mesh can be kept clean to achieve the desired ink loading and good printing results.
There are also some adjustment methods that are not considered desirable. One is to change the degree of adhesion between the doctor blade and the anilox roller, and the other is to change the degree of compression between the rubber roller and the anilox roller. (To be continued)
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