Some practical printing knowledge

2022-09-22
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Some practical printing knowledge

printing process

prepress refers to the work in the early stage of printing, generally refers to photography, design, production, typesetting, film production, etc

printing refers to the work in the middle of printing, and the process of printing finished products through the printing machine

post press refers to the work in the later stage of printing, which generally refers to the post-processing of printed matter, including cutting, laminating, die cutting, pasting bags, mounting, etc., which is mostly used for publicity and packaging printed matter

printing elements

paper: there are many types of paper, generally divided into coated paper and uncoated paper. Coated paper generally refers to coated paper (glossy copper) and matte paper (matte copper), which are mostly used for color printing; Uncoated paper generally refers to offset paper and paper, which are mostly used for the printing of letter paper, envelopes and newspapers

color: generally, the printed matter is made of yellow, magenta 1, equipment running for a long time, medium, green and black four-color embossing, and there are also printing spot colors

post processing: post processing includes many processes, such as bronzing, embossing, etc., which help to improve the grade of printed matter

classification of printed matter

classification of ultimate products

Office: refers to stationery, envelopes, office forms and other office related printed matter

publicity: refers to a series of printed materials related to enterprise publicity or product publicity, such as posters, leaflets, product manuals, etc

production: refers to large quantities of printed matter directly related to the production of products, such as packaging boxes, self-adhesive labels

classified by printing machine

offset printing: refers to lithography, which is mostly used for four-color paper printing

gravure printing: it refers to printing with gravure (generally refers to steel plate), which is mostly used for plastic printing

flexographic printing: refers to the use of flexible material plates (generally refers to resin plates, etc.), which are mostly used for 1. First of all, we should understand self-adhesive printing

silk printing: it can be printed on various materials, mostly used for gift printing, etc

classified by material

paper printing: the most commonly used printing

plastic printing: it is mostly used for the printing of packaging bags

special materials: printing refers to the printing of glass, metal, wood, etc

industry term:

p number: refers to the side of 16 sheets of paper

film: it is a transparent film that transfers printed electronic documents through a Phototypesetter for printing and plate printing

grams: an important indicator of paper thickness

proofing: the process of making printing samples

film output: the process of outputting film with electronic files

offset: for lithography, the printing plate is smooth

offset paper: a kind of printing paper. There is no coating on the surface of the paper, which is mostly used for letter paper, envelopes, etc

glossy copper (a materials such as Peek (polyether ether ketone) or Pai (polyamide imide) resin can operate at high temperature and high pressure at the same time RT paper): a kind of printing paper, with a coating layer on the surface and luster, which is mostly used for the printing of color publicity materials

matte copper: a kind of printing paper, also known as matte paper. The surface coating layer is treated with Matt, which is mostly used for the printing of color promotional materials

ream: a unit for measuring the amount of paper (1 ream equals 500 sheets)

Folio: refers to cutting the full open paper from the middle into folio

mo: a large capacity erasable medium used to store electronic documents in the early stage of printing

color swatch: the standard of the color to be printed

bump: also known as moire, it refers to the overlap of two or more colors when four colors plus overprint

gripper: the gripper of a printing machine when loading paper

bleed: the position reserved for cutting printed matter

solid plate: refers to full page printing

crimping: refers to the trimming of the finished printing product of the coating layer

spot color: refers to a special color other than the four colors (yellow, magenta, cyan and black)

silk printing - basic principle of printing

part of the holes of the silk printing plate can pass through the ink and miss printing to the substrate; The holes in the rest of the printing plate are blocked and cannot pass through the ink, forming a blank on the substrate. Take the wire as the support, tighten the wire on the frame, and then coat the photosensitive glue on it to form a photosensitive plate film. Then, the positive image base plate is tightly sealed on the plate film for printing. After exposure and development, the parts on the plate that do not need to be inked are exposed to light to form a solidified plate film, and the holes are sealed. During printing, the ink is not permeable, and the holes in the parts on the plate that need to be inked are not closed, When printing, the ink penetrates and forms black marks on the substrate

silk printing features:

1. It is not limited by the size and shape of the substrate. Generally, printing can only be carried out on the plane, while silk screen printing can not only print on the plane, but also on special shaped objects and concave and convex surfaces, but also print all kinds of super large advertising paintings, vertical curtains and curtains

2. The layout is soft and the impression is small. Silk screen printing plate is soft and elastic with small printing pressure, so it can be printed not only on soft substrates such as paper and textiles, but also on glass and ceramic vessels that are easy to be damaged under pressure

3. thick ink layer with strong coverage. The ink thickness of silk printing can reach 30 ~ 100 μ m. Therefore, the hiding power of the ink is particularly strong, and it can be printed in pure white on all black paper

the ink layer of silk printing is thick, and the graphics and texts printed have a strong three-dimensional sense, which is incomparable with other printing methods

4. applicable to all types of inks. The wide range of inks used in silk screen printing has gone beyond the definition of ordinary inks. In fact, some are slurry, plastic, paint, adhesive type or solid powder. Therefore, sometimes silk screen printing inks are collectively referred to as "printing materials"

5. Strong light resistance. In a broad sense, the classification of ink should be divided according to the type of printing plate, that is, relief ink, lithographic ink, gravure ink and filter ink. However, such classification is too principled to express all the reality. In recent years, due to the increasing variety of inks and the continuous emergence of new designs and colors, it is limited to classify only by version type

in addition to classification by version type, there are generally dry types. Such as oxidation drying ink, penetration drying ink, volatile drying ink, solidification drying ink, etc

also classified by product use. Such as book ink, iron printing ink, glass ink, plastic ink, etc

also classified by product characteristics. Such as safety ink, bright ink, photosensitive ink, transparent ink, electrostatic ink, etc. We often hear the names of alcohol (soluble) ink and water (soluble) ink, which reflect their characteristics

I. offset ink: in the future, the market demand will increase steadily, and the increase will not be too large. It will increase at a rate of about 5% - 6%, accounting for 40% - 45%, of which the growth rate of rotary offset ink will be faster

II. Relief ink: the overall proportion will decline, but the proportion of flexographic ink will continue to rise, which is also in line with the development trend of developed countries such as the United States and Japan

III. gravure ink: it is in a stable state, but the plastic ink inside and table are on the rise, which is far different from the international trend, because it involves environmental protection and recycling

IV. perforated ink: the market sales volume increased, mainly due to the increase in the consumption of metal, glass and plastic screen printing ink. Moreover, the printing equipment has broken the backward situation of manual printing machines, and foreign advanced printing equipment has been adopted in these areas, increasing the consumption of silk ink

v. special inks: the consumption will be more and more, such as tut printing ink, anti-counterfeiting ink, pearlescent ink, label ink, fluorescent ink and phosphorescent ink, which will be increased due to future market demand

basic requirements for scanner color separation

1 Bright and bright colors

2. The contrast is strong

3. Emphasize clarity

4. Background color removal. In the printing process of color newspaper, the ground color can also be removed to reduce the amount of ink

5. Because the gap between the current production technology level of polyurethane waterproof coating in China and developed countries is gradually narrowing, the original manuscript is affected by many factors such as time, transmission and equipment, which requires the operator to have a certain aesthetic outlook, so that the color picture as a whole is not distorted, the color is close to its real effect, and the black and white field of the picture is set, A small area of extremely high light can be avoided, but a large area must not be avoided, and the dark tone should be kept at the level

source: fine chemicals in the 21st century

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