About Network and Non-network Printing (I)

At present, whether it is traditional Chinese paintings, oil paintings, or advertising paintings, as long as it is carried out with layers, especially the color of the skin that expresses the screen, color separation and screen printing are used. The screens are offset, gravure, and flexo (flexographic). Copy from the printing, but there is also a version of the Muara, woodcut watermarks, screen printing without dot printing.

1 <br> <br> network printing performance color image level network printing two points in two ways:

1.1 AM Screen Printing Screen printing refers to the use of dot size to represent the depth and shade of an image within a unit area, but it has a weakness that is prone to moire.

1.2 FM network screening printing With the increase of computer computing capabilities, FM mesh screening technology has emerged. FM screening technology is consistent in the unit area of ​​the size of the network, the number of points is the density of the image to show the shades of light and shade , FM network outlets basically solved the problem of moire.

The above two screening methods use offset printing, gravure printing, embossing, or screen printing. If you want to represent the level of the image, you cannot leave the outlets. Look at the printed matter with a magnifying glass, whether it is the AM screening technology or the FM network. Thanks to the screening technology, outlets are clearly visible on the replicas, so they are certainly replicas, and they cannot be made in any way.

2 No dot-level printing <br> No dot-level printing, there are currently three ways: Pao printing, woodcut watermark printing, screen printing.

2.1. Feiluo Printing Feiluo Printing is a kind of early photolithography technology that was invented. It uses glass for plate printing, also called glass printing. Its craft is:

2.1.1 Grinding Glass The polished surface of 10mm thick glass is ground, cleaned and dried and then coated with a primer.

2.1.2 Coated bottom layer The ground glass is coated with a layer of sodium silicate and protein solution and the liquid is used as the bottom layer. After drying, the photosensitive resin is applied.

2.1.3 Coat the photoresist on a dry substrate and apply a layer of dichromate and alum enamel on the substrate. Then dry. The drying temperature is between 40°C and 60°C. Photoresist produces fine wrinkles.

2.1.4 Shaiban Consecutively adjusted negative film negative film and photosensitive film close exposure development. The unexposed photoresist was washed away during development and a water-absorbing layer was formed during printing. The light-sensitive part of the photosensitive adhesive, due to different levels of sensitive photosensitive photosensitive depth is also different, the thickness of the ink-absorbing layer is not the same.

2.1.5 Printed on a dedicated platform. The structure is a flat, circular press with a roller. The applied ink requires good fluidity and low viscosity.

Because the Feiluo printing is a negative film printing plate, the greater the amount of light on the printing plate image, the greater the hardened layer, the more wrinkles, the more ink amount is adhered, and the darker the color is when printing. On the contrary, the brighter it is.

Although Minami printing is recognized as a dotless printing method in the world, it is difficult to reproduce fine images due to insufficient levels. In Japan, there is also a print version of the Jeollas. Only prints such as certificates are made.