Advantages and Disadvantages of Multi-layer Printing Process

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.

The skilled technicians not only need to have high painting skills, but also have a profound knowledge of Chinese painting. When making a sketch, you need to make decisions about how the original is shaded, the painter's style and artistic characteristics, and the size of the screen.

Engraving wood plates: The manuscripts are affixed to the wooden plates. After the plates are dried, they can be engraved and plated. Each piece is carved into a wooden plate, and printing a painting requires engraving dozens of pieces or even hundreds of plates. The sculptors must be familiar with the paintings and paintings of ancient and modern times. They must be able to experience the original work carefully and be able to sculpt their lines and layers in a meticulous manner.

Printing: The carved wood plates are brushed in sequence. The method is to first brush the ink on the protruding portion of the woodblock (that is, the screen portion), then lay the rice paper on it, and then hold the brush to print on the rice paper. How many pieces of woodblock were printed on this rice paper, and the final product was made. It requires that the painter must be familiar with the painting technique. Before brushing, it is necessary to analyze the speed, slowness, lightness, and weight of the original acting brush. With the difference in color, lightness, dryness, and wetness, in the brushing process, According to the original rendering touch-up, etc., the brush is printed and then properly processed with a brush, so that the brush print reproduction of the original ink characteristics.

Screen-level printing can be done without copying Chinese paintings, oil paintings, and advertising paintings. The process method:

Layered separation of the original: The original is divided into multiple slices at different levels of yellow, blue, green and black by computer. If you can divide each color into 10 levels, you can separate 10 different levels of negatives for each color.

Screen printing version: 40 sheets numbered into 40 screen printing plates. The requirements of this printing process on the tension of the stretch net, the choice of the screen, the application of the photosensitive adhesive, the exposure time, and the development should be basically the same as those for the screen printing.

Printing: According to the screen number of different layers of film drying out, in order to print, this printing method is called layer printing, someone called ladder printing, the actual level is printed from shallow to deep layer. It can not only achieve the purpose of the performance level, but also achieves no dot-printing, which can be used as a real thing. For example, copying ancient paintings in France in this way gives true artistic value. The French oil painters entrusted their own oil paintings to the screen printing company. After printing and copying at the silk screen level, they were signed by the painter to give it a collection value.

The offset printing, gravure printing, embossing, and screen printing of the above-mentioned FM network outlets cannot be promoted because the replicas have outlets. However, due to lack of space, limited space, and small print, the printing of the non-website POLO printing is also limited. Gradually eliminated.

Although woodcut watermark copy images can achieve real effects, but the production cycle is long, the amount of printing is small, the cost is high, and the process of drawing, adjusting and printing is complex and the manual operation has many ingredients, although the technicians are experts, each color It is also difficult to be consistent, easy to color, there are also overprinting, deformation, and so on.

Screen-printing layer printing uses a computer to analyze originals, scan originals layer by layer, output layered negatives, and screens are printed in layers and printed in layers. The copied handicrafts are high in accuracy, rich in subtle layers, and reproducible, not only Compared with the dot-printing products, the dot-less version and the woodcut watermark cannot be compared.