Close contact with printing outlets (6)

In the network of 1% to 10% of the light and 90-99% of the deep, it will be like FM Screening (Figure 3). Using fine meshes of the same size and expressing the degree of density through these meshes The level change in the middle, in the middle of 10-90%, will be like AM Screening, to change the size of the outlets. However, the locations of all outlets are random, so it is not necessary to consider the issue of “net-line angle”.

Light position and deep position.

The light position and the deep position, due to the random distribution, and the size of different mesh points will also be different, so as to show the changes in the level of the screen, it is worth noting that the positions of the mesh points are subjected to special calculations to ensure They will not overlap with each other, and there will not be too much space between the outlets. This prevents rough granularity even more.

When the resolution of the output device is 2400 dpi, the diameter of the minimum dot is about 10.5 μm (ie, 1/2400 inch). Although these fine dots can be exposed on the printing plate, the unstable factors in the printing process often result in missing images. . But this new type of dot calculation method uses a combination of multiple small dots to form a larger dot, and the diameter of a large dot with two or three minimum dots (each 10.5 microns in diameter) is 21 or 32 microns. . This size of ideas is suitable for printing, but also can improve the reproducibility and stability of the printing.

The diameter of the big idea of ​​a combination of two or three smallest dots (each 10.5 microns in diameter) is 21 or 32 microns. This size of ideas is suitable for printing, but also can improve the reproducibility and stability of the printing.

Middle tone part.

In the midtone part, the positions of the dots will be randomly arranged like FM Screening, but the depth of the layer will be expressed in the way of AM Screening, that is, through the change of the dot size, due to advanced calculations, the shape of these dots is very sleek. Therefore, the printing adaptability will be better. In addition, special methods have been adopted to prevent overlapping of dots, which in turn can solve the problem of coarse graininess.

Features of AM/FM hybrid outlets:

This revolutionary network not only can significantly improve the printing quality, but also does not affect the production efficiency. It only needs to use the conventional 2400dpi/175lpi production processes and equipment to achieve a printing quality of 300 lpi high-line counts. In the past when implementing high-line dot printing, all processes must be strictly controlled.

Improve print quality.

1. The maps, characters, hairlines, delicate lace, and other lines are clearer, with no jagged edges and broken lines.

2. The problem of collision of screens, screens, sounds, wood patterns, etc. and patterns on the clothing is completely avoided.

3. Eliminate the appearance of net flowers such as big black spots or light backgrounds.

4. Gradual effects are more natural, flat screens and light levels are smoother.

5. Improve the color of clothes, fruits, flowers and other items.

The AM/FM hybrid network "Histida" is a screen that combines all the advantages of AM Screening and FM Screening. It is combined with a high-temperature thermal plate with external drum CtP and superhard properties. Take advantage of CtP printing technology.

Technical parameters of several commonly used printing paper and outlets:

Source: "Great China Graphic Arts"