Due to the development of technology, there are various materials for printing screens, and screen printing has become a requirement for high quality, high precision and high stability technology. Its range of applications extends to high-tech electronics and commercial printing. How to adapt to the development of the trend of the times and to be invincible in the fierce market competition is a problem that must be considered in the screen printing industry. In screen printing technology, grid is the fundamental of many factors of print quality, so the correct choice and rational use of grid is directly related to the plate making effect. The overall quality of screen printing is critical. For a wide range of screen printing applications, the web has a variety of materials, structures, and specifications. Meet a variety of different pri Nting requirements. The following commonly used screen printing grid types and application features are introduced.
Monofilament polyester screen printing net (monofilament polyester mesh cloth)
This mesh has a smooth surface to ensure the best ink-passing effect. The screen made with it can be repeated to film, reused, and has good plane stability and accurate copying accuracy. It is suitable for large scale. Printing. Halftone printing and high precision printing products.
2, high tension monofilament screen printing network
In addition to the characteristics of standard monofilament polyester screen printing mesh, the most outstanding feature is its low elasticity and durability. The tension monofilament screen printing mesh is made of a specific monofilament monofilament. Generally, the mesh cloth will have a small tension loss after 24 to 48 hours, and the net value of the high-voltage net after the loss will be smaller or even negligible. It also withstands the pulling force of the blade during printing and has strong tensile properties, which can increase the life of the screen.
3, monofilament nylon screen printing net:
Monofilament nylon screen printing meshes have exceptional tensile properties and stability, as well as proper flexibility. Due to the special treatment of the screen, the tension is stable and wearable, and the film can be peeled off repeatedly and the screen can be reused. Therefore, it is economical and durable. Suitable for uneven objects such as printing, surface printing, rough surface printing. Base, resistant to organic solvents. Excellent wear resistance and long service life.
4, dye screen printing
The difference between this dyed screen printing net and the white screen printing net is:
Using direct emulsion and capillary film stenciling, the light illuminates the white screen to reflect the film onto the film, resulting in poor image edge definition in low refractive patterns.
For dyed screens, a portion of the light is absorbed by the dye, leaving only the remaining spectrum reflected and producing low refraction on the film, which has no significant effect on image quality. So it won't break the graphics edge definition.
White and color scrims have a large effect on the sharpness of the graphic, so colored scrims are often used for fine line and halftone printing. It should be noted that the colored grid should be appropriately lengthened during the plate exposure time than the white grid. Another advantage of this grid is that the screen and test quality are easily observed during the plate making process.
5, UV screen printing
With the rapid development of science and technology, the standard screen mesh can not fully meet the requirements of UV ink printing. Since UV inks are not solvent evaporated and dried, unlike other screen printing inks, they contain almost no solvent, but photopolymerize to form a film. UV ink, if it is also printed on a standard paper web, is more soluble than the solvent ink several times thicker, which not only causes waste of ink, but also affects the curing effect of the ink to reduce the thickness of the ink. The ink deposition does not affect the printing quality. UV screen printing should be used. UV screen printing mesh can reduce the thickness of ink deposition. The reason is that the overall thickness of the grid becomes thin after a single pressure treatment. (See illustration) The thickness of the UV-based printing ink can be reduced by 35-50% (compared to the web) by a conventional grid.
In addition, the UV screen printing net has the following characteristics: facing the rolling pressure of the scraper, reducing the good and even distribution of the ink of the wiper