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Screen printing processing combines two or more colors, or uses a small amount of colors in addition to the main color, to form a combination of colors. When preparing the color ink before use, first expose the color to be prepared on the color sample separately, and correctly distinguish whether the original (or original) color is primary color, intermediate color, or duplicate color. If it is intermediate color or complex color, it is necessary to distinguish the ratio between the main color and the auxiliary color.   Secondly, it is necessary to adjust the sample according to the color tone indicated in the original manuscript. Only when the color difference is small or equal compared to the original manuscript, can it be adjusted in large quantities, and the time should be short and the adjustment amount should be appropriate. Insufficient adjustment leads to work stoppage, inconsistent ink color, and affects normal production; Excessive consumption can lead to unnecessary waste.     When coloring silk screen ink, three points should be noted: 1. When mixing ink, try to add as few different colors of ink as possible. The fewer types of ink, the better the mixing effect. 2. Adopting the principle of "from light to dark", whether preparing light or bright colored ink, caution should be taken when the hue is close to the sample. Ink produced by different manufacturers should not be mixed and used. It is recommended to use ink of different colors from the same manufacturer for color matching. Otherwise, uneven color tones may occur, and in severe cases, condensation may occur, resulting in ink scrap. 3. Some screen printing inks are dried by drying, with light colors being lighter after drying than undried ones, and dark colors being darker after drying. In addition, it is easy to overlook whether there is a difference in the color tone of the ink before and after drying during printing. Generally speaking, through natural drying, the substrate is plastic, metal, paper, glass, etc., and the color will not change; But if the coloring material used for ceramics, due to its color development after burning and oxidation, can only be adjusted based on experience. For silk screen printing ink dried by thermosetting and photopolymerization, the color may vary in depth, as mentioned above. When the ink volume is large, an ink mixer can be used to complete color adjustment in a short period of time.   Attention: When preparing light colored silk screen ink (printing material), try to add as little white ink as possible, as white ink can easily cause discoloration of other colors.

Screen printing processing technology, also known as screen printing technology, is a major printing method in stencil printing.   1. Screen printing file output; In the early stages of design, designers come up with their desired graphic effects and then convey them to the manufacturer through documentation. In screen printing production, monochrome or multi-color overprinting is commonly used, and it is necessary to make comments on the document in the early design stage. The document format is preferably a vector file. If the graphics are small or the clarity requirements are low, a high-definition image format can be provided.     2. Film production; Film, photosensitive film and film used in photography, film used in movies, generally refers to film, but can also refer to the negative film used in printing and plate making. The film in screen printing is like the film of a photograph, except that the film in screen printing changes the developing carrier from photo paper to a screen coated with photosensitive adhesive.   3. Production of screen printing screen boards; The specific process of making the mesh board: Mesh frame stretching → plate making and sizing → exposure → mesh plate washing   4. Color printing: The color of silk screen printing is basically determined in the early stages of design, but it is best for the designer to provide a color palette, which requires the designer to mix it themselves first. The ink for silk screen printing is similar to the pigments for painting. When printing, ink is poured into one end of the screen printing plate, and a scraper is used to apply a certain pressure to the ink area on the screen printing plate. At the same time, the ink moves at a constant speed towards the other end of the screen printing plate. During the movement, the scraper presses the ink from the mesh of the graphic and text parts onto the substrate.   5. Curing of Ink: There are many ways, and the most common ones are through drying, volatilization, and UV curing. Ink with different curing methods can bring different gloss and properties after printing, such as durability (mechanical resistance, chemical resistance, weather resistance), and prices also vary. Therefore, in the early stage, it is necessary to choose the appropriate ink based on cost.

The silk screen ink used in plastic spray painting is also known as silk screen ink. It is used to stretch silk fabrics, synthetic fiber textiles, or metal screen products onto a mesh frame belt, and then manually create a paint layer or photochemical reaction printing plate to make a metal screen printing plate.   This type of processing technology is widely used in the manufacturing industries of plastics, skincare products, small toys, household appliances, decorative building materials, gifts, food packaging, stationery, etc. The key characteristics of heat transfer printing technology are exquisite photos, which only require the use of general hot stamping machines and heat transfer equipment.     And the heat transfer printing process can be compressed and formed by the scraper during packaging printing, and then the printing ink can be transferred to the printing process material according to the mesh size of the text unit, thus producing a text and image similar to the paper draft. In addition, it also has the characteristics of high paint adhesion and strong bonding force.   Before silk screen printing, it is necessary to pay attention to these three points: 1. The cleaning of the silk screen processing packaging printing site should ensure that there is no dust in the air as much as possible for the packaging printing production workshop and printing plate making production workshop, otherwise it will harm the quality of packaging printing. For production workshops with high precision requirements for packaging printing, it is necessary to install air filtration equipment when necessary to maintain the cleanliness of packaging printing and printing plate making production workshops. 2. The regulations on temperature and environmental humidity, as well as the temperature difference and humidity changes throughout the four seasons, pose a significant threat to the precision of packaging printing. This is especially true for multi-color printing, where the harm is even more pronounced. Therefore, it is required that indoor humidity and temperature be relatively stable, and the temperature and environmental humidity in the room be adjusted appropriately according to seasonal changes to ensure the precision of printing dimensions. 3. Mastering the characteristics of printing process materials. With the development of technology, there are various types of printing process raw materials with different appearances. Before packaging printing, appropriate printing inks, organic solvents, and their scrapers should be selected according to different regulations.  

The mesh size of the printing screen is 1.5 mesh in international standard units of 1T 2.5 mesh is equal to 2.5 mesh holes per square inch.   The mesh size indicates the density of the wire mesh. The higher the mesh size, the denser the wire mesh, and the smaller the mesh size. The selection of screen mesh size can be based on the accuracy requirements of the printed product, and different screen mesh sizes can be chosen. The criteria for selecting the number of lines are as follows: when there is a high demand for ink volume, 70-200 lines/in should be used; for general printing, 200-300 lines/in should be used; and for fine graphics and text, 300 lines/in or above should be used.       Extended Information       Plate making method   Direct plate making method   Method: The direct plate making method is to first place the photosensitive film surface of the wrist film base coated with photosensitive material flat on the workbench, and then place the stretched wrist mesh frame flat on the film base. Then, place the photosensitive paste in the mesh frame and apply pressure with a soft scraper. After drying thoroughly, remove the plastic film base, attach the photosensitive film wrist mesh, and it can be used for plate making. After development and drying, the silk screen is produced.   Process flow: Stretching the mesh - degreasing - drying - peeling off the substrate - exposure - developing - drying - repairing - sealing the mesh   Indirect plate making method   Method: The method of indirect plate making is to first expose the indirect film, harden it with 1.2% H2O2, develop it with warm water, and dry it to make a peelable graphic film. During plate making, the adhesive film surface of the graphic film is tightly attached to the stretched screen, and the adhesive film is pressed tightly to the wet screen. The film base is removed, and the screen printing screen is made by blowing it dry with wind.   technological process:   1. Web stretched - degreased - dried   2. Indirect film - exposure - hardening - development - bonding - drying - repairing - sealing   3. Direct mixed plate making method   First, paste the photosensitive adhesive layer with water, alcohol, or photosensitive adhesive onto the screen frame, dry it with hot air, remove the base of the photosensitive film, and then print the plate. After development treatment, the screen plate is made.

1. Preparation of photosensitive adhesive: The photosensitive adhesive directly produces photosensitive materials, which are commonly divided into single liquid and double liquid types. The single liquid photosensitive adhesive has already mixed the photosensitizer into the latex during production and can be used without preparation. The double liquid photosensitive adhesive first dissolves the photosensitizer in pure water according to the formula before use, and then mixes it thoroughly in the latex, stirring it evenly and leaving it for 1-2 hours. After the bubbles completely disappear, it can be used. 2. Use of photosensitive adhesive: It is commonly divided into two types: solvent resistant and water-resistant. Solvent resistant photosensitive adhesive, capable of withstanding various organic solvents, suitable for printing with oil-based inks; Waterproof photosensitive adhesive, suitable for printing with water-based inks (water-soluble printing coatings, such as textile printing pigments), the former of which can be recovered by screen stripping; The latter generally cannot be detached and recycled. Specialized water-resistant photosensitive adhesives include nylon photosensitive adhesive and diazo photosensitive adhesive. When using, the appropriate photosensitive adhesive must be selected according to the printing object and relevant instructions.   3. Coating: Use hand coating or coating machine to apply the stretched and degreased clean screen. When coating, avoid introducing bubbles into the scraper bucket, and dry at a temperature of 30-40 ℃. The film thickness depends on the requirements of the printed material and can be controlled by the number of coating processes.   4. Drying: Dry at 30-40 ℃.   5. Exposure: Stick the film substrate onto the P surface of the screen and expose it to ultraviolet light. The part exposed to ultraviolet light loses its water solubility, and the exposure time varies depending on the photosensitive adhesive, film thickness, mesh size, and exposure time. Refer to various exposure schedules and determine the optimal exposure time before exposure.   6. Attention: Insufficient exposure will reduce the screen's durability, while excessive exposure will affect the clarity of the image.   7. Development: Soak both sides of the exposed screen with clean water or place it in a water tank for 1-2 minutes. After removal, rinse the screen with a high-pressure water gun in a mist form (the parts exposed to ultraviolet light have photosensitive glue hardened on the screen, and the parts not exposed to ultraviolet light dissolve in water) until all patterns are developed clearly. Remove excess water with a pressure air gun, chicken skin cloth, etc.   8. Drying: Dry at 30-40 ℃.   9. Storage Sensitive materials should be stored in a sealed manner. 1. Non sensitized: 12 months, sealed, dry, and dark place at 20-25 degrees Celsius, avoiding direct sunlight. Need to avoid high temperature and high humidity. Even with packaging, avoid direct sunlight exposure. 2. Sensitization: Approximately 6 weeks at 20-25 degrees Celsius. Coated screen: 4 weeks, in an environment of 20-25 degrees Celsius and darkness.

The commonly used screens for screen printing include nylon screen, polyester screen, and stainless steel screen The advantages and disadvantages are as follows: Nylon wire mesh Advantages: High elongation rate; Low static electricity; Good ink permeability; Good resilience; High durability rate;     Disadvantages: Poor acid resistance; Caution: It is not advisable to print high-precision products or large products; After immersion in water (or when printing water-based ink), it is prone to relaxation; Polyester wire mesh, also known as polyester wire mesh: Advantages: Chemical resistance; Disadvantages: Low elongation rate; Low durability rate; Low ink permeability; Easy to generate static electricity Attention: Solvent based printing inks often produce "drawing" phenomenon Stainless steel wire mesh: Advantages: Low stretchability of the net; High intensity; Good ink permeability; Stable dimensional accuracy; Strong water and chemical resistance; Disadvantages: Poor elasticity; Expensive price; Attention: Stainless steel wire mesh cannot be restored to its original shape after being stretched. Advantages of screen printing: (1) Not limited by the size and shape of the substrate General printing can only be done on a flat surface, while screen printing can not only print on a flat surface but also on special shaped objects such as spherical surfaces. Anything with a shape can be printed using screen printing. (2) Soft layout with small printing pressure The wire mesh is soft and elastic. (3) Strong ink layer coverage It can be printed in pure white on all black paper, with strong three-dimensional effect. (4) Suitable for various types of ink (5) Strong resistance to optical rotation Can keep the gloss of printed materials unchanged. (Both temperature and sunlight have no effect). This allows for the printing of some stickers without the need for additional lamination or other processes. (6) Flexible and diverse printing methods (7) Convenient plate making, affordable price, and easy to master technology (8) Strong adhesion (9) It can be printed by hand or machine

There are some regulations for the operation of any machine, and fully automatic screen printing machines are no exception. Next, let's briefly understand the regulatory requirements.   1. After positioning the screen of the screen printing machine, use a caliper and tape measure to check if the positioning dimensions meet the requirements of the drawing. Ensure that there is a certain gap between the screen during positioning (usually about 3-5mm depending on the tightness of the screen).     2. Printing technique of screen printing machine: Hold up the scraper and pull it up at a constant speed at a 45 ° -50 ° angle with the screen. The scraper should be evenly stressed at both ends during operation. The printing direction should be consistent with the printing direction when adjusting the position to prevent displacement during printing   3. Strictly inspect the position and size of the silk screen on the first piece according to the drawing, and check for any defects such as missed printing, wrong printing, dry screen, grease, dust, burrs, oil shortage, broken lines, oil leakage, and ink pollution in other parts of the pattern.   4. The silk screen color is compared with the standard color card and customer confirmed color palette, and there is no obvious color difference visually.  

Printing machinery is a general term for mechanical equipment such as printing machines, binding machines, plate making machines, and other auxiliary mechanical equipment. These mechanical devices have different performance and uses, therefore, the mechanical forms that make up them are not completely the same.   There are many types of printing machines, which can be classified according to the following five aspects:   1、 According to the layout type, it can be divided into: relief printing machine, planographic printing machine, gravure printing machine, and stencil printing machine;   2、 According to the size specifications of the paper, it can be divided into: flat or single sheet printing machine, roll paper printing machine;     3、 According to the number of printing colors, it can be divided into monochrome printing machines, two-color printing machines, and multi-color printing machines;   4、 According to the printing format, it is divided into "eight open printing machine, four open printing machine, split printing machine, full sheet printing machine, ultra full sheet printing brush machine, etc;   5、 Although there are many classification methods for printing machines, the core part of the printing machine is the embossing mechanism of the printing device. Therefore, based on the way pressure is applied, printing machines are generally divided into flat press flat type, circular press flat type, circular press flat type, and oblique press flat type.

The various products in China's screen printing industry are ranked by the number of manufacturers as follows: signs and panels, plastic sheets, advertising materials, and printed circuits. Some emerging screen printing fields are growing at an extraordinary speed, such as optical discs, anti-counterfeiting printing, etc.   Packaging Printing - The main service target of the packaging industry is the screen printing industry. The continuous development and application of screen printing technology will better serve the packaging and decoration industry, contribute to the prosperity of the packaging and decoration industry, and also bring a broader market for the screen printing industry. Such as printing high-end packaging boxes, bottles, cigarette packs, etc. If the shell of large electrical products is printed with bright images using screen printing technology, these large shell decorated products will be loved by customers no matter which shopping mall they are placed in, playing an irreplaceable role in packaging advertising. With the continuous development of computer technology today, various types of software continue to emerge, especially the production of CDs for cultural entertainment, television, movies, and various publications, which is increasing day by day. 92% of the company logo, images, and text printed on this CD are done using screen printing. Screen printing equipment has the characteristics of low investment, low cost, and is suitable for printing multiple varieties of CDs and CDs.     Advertising printing - Screen printing will have more market in commercial advertising, especially for electrical and tobacco companies that attach great importance to the role of advertising in promoting their image. The timing and quality of advertising determine the company's market share. Therefore, various electrical advertisements, outdoor advertisements, and commercial advertisements provide vast space for screen printing. In commercial competition, large outdoor advertisements are valued for their wide field of view and good effectiveness. So, with the development of commodity advertising, China's screen printed color outdoor advertising has increasingly shown advantages such as large batch size, low price, bright colors, and fast delivery. It has been recognized by more and more urban planning departments and advertising management departments, attracting many advertising merchants.   Circuit printing - Screen printing accounts for 80% of the market share in the electronics industry. For example, in the production of a television, screen printing is used in many places, and the development of large flat display devices such as PALC screens is increasingly inseparable from screen printing. For example, the POP board discharges xenon gas by applying an external voltage, and the emitted ultraviolet light is converted into visible light after being irradiated onto the fluorescent material. If using screen printing and mass production of 40 grade boards, the width of the partition can reach 30 μ m.   Craft printing - With the development of western China and the process of rural urbanization, the momentum of increasing ceramic tile production lines is strong. In addition, China is a major ceramic country, which not only meets a large domestic demand, but also exports to more than 150 countries and regions. Therefore, screen printing of ceramic flower paper plays a crucial role in China's screen printing industry.  

Advantages of screen printing:   (1) Not limited by the size and shape of the substrate   General printing can only be done on a flat surface, while screen printing can not only print on a flat surface but also on special shaped objects such as spherical surfaces. Anything with a shape can be printed using screen printing.     (2) Soft layout with small printing pressure   The wire mesh is soft and elastic.   (3) Strong ink layer coverage   It can be printed in pure white on all black paper, with strong three-dimensional effect.   (4) Suitable for various types of ink   (5) Strong resistance to optical rotation   Can keep the gloss of printed materials unchanged. (Both temperature and sunlight have no effect). This allows for the printing of some stickers without the need for additional lamination or other processes.   (6) Flexible and diverse printing methods   (7) Convenient plate making, affordable price, and easy to master technology

Many friends are very cautious when choosing a screen printing machine, so how should we choose a high-quality screen printing machine? Let's briefly introduce these points below, hoping to help our friends.   1、 Firstly, choose the quality of the screen printing machine, and check the machining accuracy of its components. Fine workmanship is generally better.     2、 To make good equipment, it is important to understand the materials used in the machine.   3、 Then it is necessary to consider the after-sales service of the manufacturer, and understand the supporting service status of the manufacturer. Sometimes, it is necessary to print satisfactory works, which requires coordination and cooperation in all aspects. If there are any problems with the machine, can the manufacturer cooperate with you in a timely manner to repair it and not delay your production.   4、 Secondly, it is necessary to choose a reasonable price. When choosing to purchase a screen printing machine, the first thing to consider is the level of precision required for the screen printing of your product. You can choose a machine with a suitable price based on your own situation, while meeting the requirements of screen printing. Sometimes a cheaper screen printing machine can also achieve the expected printing effect.   5、 Finally, it should be reminded that many buyers choose smaller distributors or retailers for the sake of affordability when purchasing screen printing equipment. The first choice for purchasing equipment is from a manufacturer, followed by a manufacturer with relatively complete technical support and direct sales points in the region. It is advisable not to choose smaller distributors or retailers as they do not have good technical support and after-sales guarantee.

Introduction to screen printing of fully automatic screen printing machine. Screen printing, also known as screen printing, is the equipment used. Screen printing belongs to stencil printing, which is known as one of the four major printing methods along with flat printing, embossed printing, and gravure printing.   Perforated printing includes transfer plates, engraved pattern plates, spray printing, and screen printing. The principle of stencil printing is that during printing, the printing plate (made of paper film or other plate substrates with ink holes) transfers ink through the holes of the stencil to the substrate (glass, plastic, film, metal, paper, ceramic, etc.) through a certain pressure, forming patterns, colors, or text lines. During printing, the ink is transferred to the substrate through the mesh holes of the graphic and text parts by the horizontal scraping and squeezing of the scraper blade, forming a graphic and text image similar to the original. Screen printing equipment is simple and easy to operate, with simple printing and plate making, low cost, and strong adaptability.     Screen printing has a wide range of applications and is suitable for a variety of products. Common printed products include various flat surfaces such as glass, plastic, film, metal, ceramics, cards, nameplates, etc Transliteration printing, also known as Z simple stencil printing, began in the late 19th century. This type of printing is made on specially made wax paper using a typewriter or iron pen to create wax paper graphic plates. Ink rollers are used to print on the wax paper plates, resulting in ideal printing effects on the substrate. In stencil printing, screen printing is widely used Screen printing is the process of stretching silk fabrics, synthetic fiber fabrics, or metal wire mesh onto a frame, and using manual coating or photochemical plate making methods to produce screen printing plates.   Modern screen printing technology uses photosensitive materials to create screen printing plates through photographic plate making methods (making the screen holes of the graphic and textual parts of the screen printing plate through holes, instead of blocking the screen holes of the non graphic and textual parts) for various flat surfaces such as glass, plastic, film, metal, ceramics, cards, nameplates, etc Waiting for planar carriers, etc. The above is the basic introduction of screen printing knowledge for fully automatic screen printing machines.

How much do you know about the screen printing advantages of screen printing machines? Nowadays, screen printing machines have been widely used in various industries. The printing method of screen printing machines belongs to stencil printing, which is known as the four major printing methods along with flat printing, convex printing, and concave printing. Screen printing machines, also known as screen printing machines, are divided into fully automatic and semi-automatic, as well as fully automatic screen printing machine production lines and smart factories. The most widely used method is flat screen printing using screen printing machines. So what are the printing advantages of screen printing machines? Below, the editor from Shenzhen Quantong Screen Printing Machine Manufacturer will introduce to you:   Products printed using screen printing machines show obvious color development: Screen printing machines use a variety of ink types and can also utilize other pigments. So using a screen printing machine to print it has the characteristic of being relatively light resistant. And because he prints in a variety of colors, the printing used on objects that can be displayed outdoors, such as billboards, is usually done using screen printing machines.     Products printed using screen printing machines have strong three-dimensional effects and bright and clear colors: Due to the characteristics of the ink used in screen printing, the thickness of the ink layer is relatively high. So compared to other printing methods, the products printed by screen printing machines will look more three-dimensional. Especially for the ink printing on some delicate parts, if printed by other methods, it is likely to appear blurry and unclear. But if printed with a screen printing machine, it can be presented very clearly. Moreover, screen printing machines can not only print in solid colors, but also print in various different colors.   The use range of screen printing machine is wide: Due to the specific frame of the screen printed by the screen printing machine, products printed by the screen printing machine can be larger than those printed by other printing methods, which is a great advantage compared to other printing methods. Because of this, screen printing machines have a larger printing range in the printing industry. This is a very good advantage for development.   That's all for the introduction of the printing advantages of the screen printing machine mentioned above. The screen printing operation is simple and easy to master. The machine is easy to install and operate. Greatly improved the work efficiency of large and small enterprises and factories.

Today, Hong Kong Dragon Intelligent will share with you the reasons for static electricity generated during the printing process of screen printing machines: especially in the screen printing process, when the network template pops out of the substrate, the ink in the network pattern part will also form fluffy spider silk with the screen, which will be pulled up from the substrate and float. As the screen continues to rise, this spider silk drifts with the wind and spills back and forth on the substrate, making the surface of the substrate dirty and the edges of the pattern less sharp. This phenomenon is very annoying and no printing personnel want to see it. This is an electrostatic phenomenon. What's going on with those static electricity?   From an atomic perspective, all neutral materials, such as plastics, paper, and other insulating materials, are positively charged atomic nuclei in each atom, which interact with negatively charged electron clouds around them. When materials are separated by frictional contact, electrons in the insulating material will dissociate to the surface of the material.     In optical disc printing, the so-called screen printing is the process of transferring ink to the substrate through the relative movement of the network version and the ink scraper under a certain scraping pressure. Screen printing (silk screen) and ink scraper (polyurethane adhesive scraper) are insulators. In screen printing, they undergo relative scraping and friction in position, especially under low humidity, which can generate static electricity and affect the distribution of surface charges on the substrate. Especially for insulation materials such as PC substrates used for optical discs, PET substrates used for touch opening, and PVC used for names and logos, static electricity can be generated during screen printing operations if not careful. For example, when screen printing film switches with decorative ink, the PET base will not stick a layer of PVC on the surface after production, and the surface will not be scratched. However, before cutting the silk screen, the protective film must be removed. Usually, some operators will quickly remove the protective film when tearing it off. Who knows, at this moment of rapid removal, static electricity will be generated on the surface of the PET sheet during the rapid separation of the protective film from the PET sheet, especially at low humidity. Therefore, there are quality issues such as flying hairs on the ink at the edges of the printed text on screen printing, and ink threads of plush patterns sinking on transparent PET sheets. This is a typical example that once caused great confusion for the screen printing workshop of film switch units. Due to the presence of static electricity, the production difficulties caused by static electricity during the printing process are significant.   Sometimes, the presence of static electricity is also related to the printing process not meeting the requirements. When the humidity is low and the ink solvent is insufficient, on the one hand, static electricity cannot be transmitted through moisture due to low air humidity, resulting in low ink solvent and high viscosity. The ink itself naturally produces drawing; If the printing speed is increased, the strong friction between the ink scraper and the network will generate static electricity. Especially under the conditions of high tension network versions, the pressure of polyurethane adhesive scraping the screen is high and the scraping speed is fast, which can cause static electricity. This is why screen printing machines generate static electricity during the printing process.