What is screen printing?

Question 1: What does screen printing mean? Screen printing belongs to stencil printing, and it is called four printing methods together with lithography, gravure printing and gravure printing. Stencil printing includes copying stencil, engraving stencil, stencil printing and screen printing.

Question 2: What is screen printing? What is offset printing? Screen printing is to print ink on the substrate by screen printing as a grid. Compared with convex, flat and concave printing, it has a wider printing range and more advantages. More and more kinds of inks and printing materials are used.

-Screen printing is not limited by the size and shape of the substrate. It can be printed on molded objects and concave-convex surfaces with different shapes. -The layout is soft and elastic, which is a printing with the least printing pressure.

-Screen printing ink is thick and has strong adhesion. The printing thickness can reach 30- 100μm, the hiding power of the ink is particularly strong, and the printed graphics and texts have a strong three-dimensional effect, which is unmatched by other printing methods (the thickness of the ink layer can also be controlled). -Suitable for all kinds of inks: with strong adaptability, it can be used to print any kind of paint, such as oily, water-based, synthetic resin, powder and other inks. As long as it can penetrate the fineness of the screen, ink and paint can be used. It can be printed in monochrome, and it can also be printed in color through color matching and screening.

-Strong light resistance: Light-resistant pigments and fluorescent pigments can be put into the ink in a simple way, so that the graphics and texts of the printed matter can remain shiny permanently, free from the influence of temperature and sunlight, and even glow at night.

-Easy plate making, low price, flexible and diverse printing methods, and easy to master technology.

Screen printing is widely used in thin film switches in electronic industry.

Silk screen printing process: manuscript → base plate → screen plate → printing plate → development → drying → printing → drying → finished product inspection → printed matter.

Offset printing is a kind of lithography. Simply put, offset printing is a printing method that transfers the pattern on the printing plate to the substrate with the help of a blanket. It is also the existence of blanket that gives this printing method its name. Blanket plays an irreplaceable role in printing, for example, it can make up for the unevenness of the substrate surface, make the ink fully transferred, and reduce the transfer of water on the printing plate (see below for the role of water in printing) to the substrate. The above is just a general concept. What we usually call offset printing now, perhaps in a narrow sense, is a three-roll lithography method (printing plate, blanket and impression), which is called offset printing in southern China.

The three principles of offset printing are as follows: 1. The water-oil incompatibility principle, the so-called similarity compatibility principle in chemistry, determines that the molecular polarities of micro-polar water molecules and non-polar oil molecules are different, resulting in the inability of water and oil to attract and dissolve. The existence of this rule makes it possible for a flat printing plate to distinguish between pictures and texts and blank parts by using water. Second, the principle of surface selective adsorption, according to the different surface tension, can adsorb different substances, which also provides the possibility for graphic color separation of offset printing. Third, the principle of dot image construction, because the offset printing plate is flat, it can not rely on the thickness of ink to express the graphic level of printed matter, but can effectively express rich image levels by splitting different levels into tiny dot units that are imperceptible to the naked eye.

In China, offset printing is the absolutely dominant printing method. Because of the advantages of fast printing speed, relatively stable printing quality and short printing cycle, books, newspapers and a considerable number of commercial printing are using offset printing. When it comes to printing, people immediately think of offset printing. Foreign brands such as Heidelberg, Roland, Mitsubishi and Komori are familiar to ordinary people.

Question 3: What is screen printing? Dye is coated on a film with a specific pattern, and fuel is printed on the object to be printed through a pattern.

Question 4: What does the screen printing machine mean? As the name implies, screen printing workers are workers engaged in screen printing. Screen printing also means printing.

Question 5: What is screen printing of characters? It's simple. If it is a small batch, just ask the manufacturer to make a screen version. You can also make one yourself if you have materials. Just scrape it with a rubber brush, and then touch it when it is dry to see the effect.

Question 6: What is screen printing, also known as "screen", "mesh" and "screen printing"? Optical tools for photographic plate making. A commonly used screen for letterpress and planographic plate making is to use two pieces of optical glass, which are engraved with black and white parallel lines with the same width and cross each other at 90 degrees to form a grid. The incident light is divided in front of the negative, and due to diffraction, dots of different sizes are formed on the negative to show the level of the picture.

Hangzhou Xiaohongshu Electronic Technology Co., Ltd. provides screen printing services, and the basic knowledge of screen printing/production is provided as follows:

Basic knowledge of screen printing

First, the screen classification

1, polyester screen (polyester) PET 1000(SL/S/T/HD)- Take 120/305 as an example, * * is divided into three specifications:120-31.

Features:

-High tensile strength (tension)

-Good wear resistance, insensitive to climate.

-Good acid resistance (sulfuric acid, hydrochloric acid and nitric acid) and solvent resistance.

2. Nylon net PA 1000 (stainless steel)

Take 120/305 as an example: * * is divided into two specifications: 120-30 (S pole) 120-35 (T pole standard).

Features:

-Good wear resistance (good wear resistance to rough or curved surfaces)

-Good surface tension and high elasticity.

-Good solvent resistance

-Good alkali resistance

Second, how to choose a screen:

1, screen structure and mesh number

The geometric structure of the screen refers to all the two-dimensional and three-dimensional appearances of the screen, and the basic elements of its geometric structure are the mesh number and the diameter of the screen.

For example, 120-34 means 120 network cables per cm, and the calibrated diameter of each network cable is 34um.

* * Screen mesh refers to the number of silk threads per centimeter.

* * Mesh diameter refers to the calibrated value of mesh diameter of non-woven fabric.

* * The geometric structure of the screen is divided into flat screen (1: 1) and inclined screen (2: 1, 2: 2, or 3: 3).

The different mesh sizes of different weaving methods determine the ink permeability of the screen (ink permeability is an important factor to determine the printing effect)

2. Determination of screen opening: (w)

* * Maximum particle size in screen printing ink (the average particle size of ink in printing must be less than 1/3 mesh).

* * The fineness of lines and the level of dot printing (too large an opening will leak too much ink and fine lines cannot be obtained)

* * Stripping performance of ink (e.g. large particles of ink block the screen, thus affecting the penetration of ink in the next printing)

* * Ink layer thickness (too small opening, less ink penetration, unable to obtain a thicker ink layer)

Generally speaking, a screen with an opening larger than the screen diameter can reproduce higher resolution than a screen with a mesh smaller than the screen diameter. (Of course, ink fluidity, viscosity and other factors will also affect. )

Third, the correct tension net:

1, standard net drawing step:

The screen can be stretched to the required tension value within 1-3 minutes, but before the screen is fixed to the screen frame, you must wait for more than 15 minutes, and then increase the tension to the final required tension value. If this process is repeated several times, the tension loss will be reduced in the future.

* * * Stay for 5 minutes after laying the net, and the tension loss is more than 28%.

* * * Stay after laying the net 15min, and the tension loss 15%-20%.

* * * Stay for 30 minutes after laying, and the tension loss is 10%.

The above tension loss refers to the tension loss during the online gluing and just pulling, not the tension loss after 24 hours of online gluing. Generally, the overprinted screen requires at least 24 hours after pulling the screen, otherwise overprinting is not allowed or the lines are deformed.

After the screen is stretched, the printing screen should be fixed on the screen frame, and the tension it bears is determined by the tensile resistance of the screen (that is, the maximum tension it can bear). The tension of the screen is to ensure the accuracy of overprinting ... >>

Question 7: What is screen printing in printing industry? What is offset printing? Offset printing is a kind of lithography. With the help of rubber, the pattern on the printing plate is transferred to the substrate, which can make up for the unevenness of the substrate surface, make the ink transfer fully, and reduce the transfer of water from the printing plate to the substrate. This printing method is called offset printing in southern China. Offset printing is Kodak.

Screen printing belongs to stencil printing, including copying, engraving, inkjet printing and screen printing. The principle is: when printing, the ink is transferred to the substrate (paper, ceramics, etc.). ) through the holes of the perforated plate, images or characters are formed by a certain pressure.

At present, there is a new printing method, uv printing, which uses led lamps for instant printing.

Question 8: What is screen printing and what is the process? Screen printing is short for "screen printing". Screen printing is to stretch silk fabric, synthetic fiber fabric or metal screen on a screen frame, and make a screen printing plate by hand carving paint film or photochemical plate making. Modern screen printing technology is to make a screen printing plate by photographic plate making with photosensitive materials (making the screen holes in the graphic part of the screen printing plate as through holes, but not blocking the screen holes in the graphic part). When printing, the ink is squeezed by the scraper and transferred to the substrate through the mesh of the graphic part to form the same graphic as the original. Screen printing equipment is simple, easy to operate, simple in printing and plate making, low in cost and strong in adaptability. Screen printing is widely used. Common printed materials include: color oil paintings, posters, business cards, binding covers, commodity signs, printing and dyeing textiles, etc. However, screen printing is a pollution process. First of all, the plate-making process produces developer, the ink used produces ink barrels, and cleaning wastewater or waste rags are produced during cleaning.