What does screen printing mean?

Also known as "screen", "screen version" and "screen version" 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 overprinter. ......

What is screen printing?

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. The principle of stencil printing is that when printing, the ink is transferred to the substrate (paper, ceramics, etc.). ) pass through the perforation of the template with a certain pressure to form an image or text.

1 Basic Introduction Editing

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 and printed textiles.

2 concept definition editing

Transcription printing is the simplest stencil printing, which started at the end of19th century. This kind of printing is made of special wax paper with typewriter or iron pen, and printed on the wax paper with ink roller, and the ideal printing effect can be obtained on the substrate. Screen printing is widely used in stencil 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 use photosensitive materials to make screen printing plates by photographic plate making (making the screen holes in the graphic part of the screen printing plate be through holes, but the screen holes in the non-graphic part are blocked), such as plane carriers such as oil paintings, prints, posters, business cards, binding covers, commodity packaging, commodity signs, printing and dyeing textiles, glass and metal.

3 plate making method editing

Direct plate making method

Methods: The direct plate-making method is to spread the photosensitive film coated with photosensitive materials on the workbench, lay the stretched wrist net frame flat on the film base, then put the photosensitive paste into the net frame and press it with a soft scraper, and remove the plastic film base after drying, so that the wrist net with the photosensitive film can be used for printing. After developing and drying, the screen printing plate can be made.

Process flow: stretching the screen-degreasing-drying-stripping the film base-exposure-development-drying-revision-sealing the screen.

Indirect plate making method

Methods: The indirect plate-making method is to expose the indirect film, harden it with 1.2% H2O2, develop it in warm water, and dry it to make a strippable graphic negative. When making a plate, the film surface of the graphic negative is attached to the stretched screen, and the film is attached to the wet screen by extrusion, and then the screen base is removed and air-dried to make the screen.

Process flow:

1). Stretching net-degreasing-drying.

2). Indirect film exposure hardening development

1 and 2- bonding-blow-drying-revision-screen sealing

3) Straight chamber mixed plate-making method

First, use water, alcohol or photosensitive glue to stick the photosensitive glue layer on the screen frame, after hot air drying, remove the film base of the photosensitive glue, and then make plate making and development to make the screen board.

4 origin invention editor

Screen printing originated in China and has a history of more than two thousand years. As early as the Qin and Han Dynasties in ancient China, the method of sandwiched printing appeared. By the Eastern Han Dynasty, batik printing was popular, and the level of printed products also improved. During the great cause of Sui Dynasty, people began to use silk screen to stretch the frame printing, which made the clip printing process develop into screen printing. According to historical records, the fine clothes worn in the court of the Tang Dynasty were printed in this way. In the Song Dynasty, screen printing developed again, and the original oil painting was improved. Starch rubber powder is added to the dye to make it become the size of screen printing, which makes the screen printing products more colorful.

Screen printing is a great invention of China. American Screen Printing magazine once commented on China's screen printing technology: "There is evidence that people in China used horse bristles and templates two thousand years ago. The costumes in the early Ming Dynasty proved their competitive spirit and processing technology. " The invention of screen printing promoted the development of human material civilization in the world. Today, two thousand years later, screen printing technology has been continuously developed and perfected, and now it has become an indispensable part of human life.

5 market prospect editor

Screen printing has the advantages of large batch, low price, bright color, long shelf life and fast delivery, which is recognized by more and more industries and widely used. On the circuit boards of household appliances, patterns on textiles, patterns on T-shirts, T-shirts and shoes, characters on the panels of refrigerators, televisions and washing machines, and decorations on ceramics, glass, walls and tiles; Various commercial advertisements such as electrical appliances, packaging, outdoor, fixed and mobile advertising platforms; exist ......

What is used to clean screen printing?

Ghost ointment

Please accept it, thank you!

What do you mean by mesh and film thickness? For example, what does 500*350 mesh 15um mean?

The mesh number can usually explain the density between screen wires. The higher the mesh number, the denser the screen and the smaller the mesh. Conversely, the lower the mesh number, the thinner the screen. The larger the mesh, the 350 mesh is the mesh number, and the area of 1 square centimeter has 350 meshes.

15um (micron) is the thickness (film thickness) of the photosensitive adhesive. But the actual printing ink thickness is less than 15um.

What does 500 mean? I don't know! It may be the model or the screen size.

How to choose the mesh of screen printing? 5 points

Hanukkah,

What silk screen is used for stainless steel cups?

Generally, 300 mesh and 350 mesh screens can be used.

Production and printing technology of screen printing

The production of the screen is relatively simple: first, stretch the screen, clean the screen, coat the photosensitive adhesive, dry the photosensitive adhesive, expose, develop, rinse the screen, dry and repair the edge of the screen, which is basically the case; If you print oily ink, you must have a printing table for manual printing. For semi-automatic printing, as long as there is a good screen and a good position, screen printing can be carried out. If it is water-based, it is generally a printing process. Manual printing is generally a printing platform (generally a rectangular marble desktop with some yards on both sides), and machine printing is generally an octopus screen printing machine or an elliptical machine.

What is the difference between screen printing and lithography? What do you mean, penetrating, impenetrable?

Screen printing is a printing method which uses screen as printing screen and prints ink on the substrate through screen.

Lithography is a traditional gravure/relief printing, which can be roller or lithography. Ink is attached to the graphic part of the layout and then transferred to the substrate.

Permeability may mean that ink passes through the substrate to the other side. Impermeability should mean that ink adheres to the surface of the substrate to form a thin layer, which is called surface printing.

What is the situation that the screen printing radian of screen printing machine is always paste?

Hello, this may be related to the following situations:

1, ink viscosity, curing agent ratio

2. Ink thickness

3. The closing gap between the screen and the plastic part is too small, and it is stained with ink twice during separation.

4. The printing strength and whether the blade of the scraper is sharp and the angle is appropriate are also related to item 2 above.

5. The shaft clearance of the screen bracket is too large. Adjust shaft clearance (replace bearing).

6. The number of screen versions

The above is Chen Meizi's reply, I hope I can help you.