Whether it is traditional Chinese painting, oil painting, or advertising painting, as long as it is carried out with layers, especially the color of the skin that expresses the screen, color separation and screen printing is performed, and offset printing is performed by offset printing, gravure printing, and letterpress printing (flexographic printing). Duplicated, but there is also a diao version, a woodcut watermark, and a silk screen version without dot printing.
Dot printing
There are two types of dot printing that represent the level of color images. AM website printing: refers to the depth and depth of the image in the unit area, using the size of the dot, and its weakness is the prone to moire. FM network screen printing: With the increase of computer computing capabilities, FM network screening technology has emerged. FM screening technology is consistent in the size of the network within the unit area, the number of network points is the density of the image to show the shades of light , FM network outlets basically solved the problem of moire.
The above two screening methods use offset printing, gravure printing, letterpress printing, or screen printing. To display the image level, one must not use outlets. Look at the printed matter with a magnifying glass. Whether it is the AM screening technology or FM network screening. Technology, outlets are clearly visible on the replica.
No dot-level printing
No dot-level printing, there are currently three ways: Fei Luo printing, woodcut watermark printing, silk screen printing.
The Milo printing is a very early photolithography technology invented. It uses glass for plate printing, also known as glass printing. Its craft is:
Grinding glass: The polished surface of 10 mm thick glass is ground, cleaned and dried and then coated with a primer.
Coating the bottom layer: The ground glass is coated with a mixture of sodium silicate and protein solution and the liquid is used as a primer layer. After drying, the photoresist is applied.
Imprinting adhesive: Apply a layer of dichromate and alum enamel on the substrate after drying, then dry. The drying temperature is between 40°C and 60°C. The glue will produce fine wrinkles.
Shaiban: Consecutive tone 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.
Printing: Printed on a dedicated platform with a stencil printing press. The structure is circular and flat, and the roller is used for printing. The applied ink requires good fluidity and low viscosity.
The printing of the sinusoids is a negative stencil printing. The larger the amount of light received on the plate image, the larger the hardened layer. The more wrinkles, the more ink is adhered, and the darker the color is when printed. 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.
Woodcut watermark is the invention of China and it is my traditional printing method. It is recognized in the world and its process:
Trace description (color separation)
(1) When enveloping, mask the transparent and impervious film paper on the original, and then copy the picture faithfully on the film.
(2) The gannet paper is then smeared into the paper on the manuscript, and the colors are separated according to different hue. The dots, lines, color blocks, inscriptions, seals, and picture layers are each described as a piece of manuscript. How many shades of the original artwork are described in the number of drafts.