Several key factors in selecting screen mesh (part 1)
In different screen printing applications, the choice of the number of screen meshes and screen types is not an easy task. The choice of screen mesh is a process that requires understanding and considering the many characteristics of the screen that affect the printing effect. This article discusses these features and provides tips for a full understanding of screen conditions and how many variables affect printing.
The composition of screen mesh
Screen printing technology benefits from the continuous improvement of the materials it uses. The earliest screens were made of natural multi-fiber materials such as silk and cotton. Later, synthetic multi-fiber materials were developed and monofilament nylon, polyester and stainless steel materials appeared.
The latest screen materials include some very interesting mixtures for special printing, which require special strength and dimensional stability. The different tensile strength of these materials determines the strength and dimensional stability of the braided screen. These special properties produce different printing effects, although other factors such as emulsions, inks, and squeegees are exactly the same.
Advances in mesh structure and improvements in screen weaving and finishing have provided favorable conditions for printing in today's environment. However, there are still many variables to consider when choosing a screen.
Screen mesh structure/strength
Two screen types are commonly used in modern screen printing: multifilament mesh and monofilament mesh. The multifilament mesh structure is mainly used for coarse wire meshes, it has the lowest dimensional stability, and the ability to print subtle levels is the worst. This screen can make a durable, strong screen for filtration. Multi-fiber structured screens provide excellent adhesion to emulsions and capillary photoconductive films. Before the more stable material had emerged, it had been successfully used with direct/indirect film. However, the screen of this structure makes cleaning and recycling difficult.
There are various mesh diameters of a single fiber mesh. In general, the thicker the wire diameter, the stronger the screen strength. In some applications, large screen meshes and high mesh counts are required. Twill weave is required to achieve satisfactory results. Twill weave is sometimes the best choice because it is strong and strong. These screens are not suitable for four-color printing because the substrate contact and mesh interference are more, however, due to their durability, they are suitable for heavy industrial applications and textiles.
As the mesh becomes finer and finer, the woven wire mesh is also more refined. Intermediate grade screens can be used for finer print jobs, including four-color printing and thin lines.
Although the development of technology has made the thick meshes more durable, it is necessary to sacrifice the strength of some meshes in order to obtain a finer level.
To determine the number of screen meshes required, the print operator should recognize that a single dot should cover at least three meshes, four being the best, to avoid dot loss and to ensure minimum dot printability.
The finest polyester mesh is used for the highest screen mesh. The finer the mesh, the larger the mesh and the finer the screen. A great deal of research and development has been devoted to making ultra-fine meshes more sturdy and stable. The finer the screen, the thinner the ink layer. In order to obtain a thinner ink layer, one side of the polyester mesh can be calendered with heat. This process makes the screen thinner and the surface very smooth, which makes the silk screen suitable for coating transparent coatings because it reduces the consumption of transparent paint and reduces the cost.
Nylon mesh is suitable for making screens for printing complex surfaces or containers. Nylon is more extensible than polyester and can adapt to rough, uneven or rounded surfaces. However, these characteristics make it unsuitable for most applications requiring dimensional stability and low elongation.
Stainless steel wire has the highest strength to meet the mesh diameter requirements, so it is suitable for fine printing, fine printing requires precise coverage of the ink and good dimensional stability for better registration. Due to the sturdy steel wire, very fine wire can be used. Finer meshes reduce the interference of the mesh—the reduction in the incidence of sawtooth and moire, and improve the transfer of ink. In addition, the screen can be calendered for precise control of the screen thickness, which is critical in the electronics industry.
In the process of calendering, the nodules of the mesh are pressed together so that the mesh has a better dimensional stability. This screen is used for electronic devices, RFID and other precision printing. Stainless steel screens are also made in 3D sizes to print particularly dark, narrow lines. This screen can obtain both a thick ink layer and sharp edge definition because it extends straight in one direction and reaches the highest point on the opposite mesh to achieve greater depth.
Regardless of the material, advances in mesh composition and structure have improved the printing capabilities in different applications.
Choose the suitable and high quality meshes
The printing plate is most important for screen printing, and the screen mesh is the core of the screen printing plate. No matter how good the frame is, if the mesh is not good or suitable, it will seriously affect the printing effect and customer experience. Wuxi Jinfeng Silkscreen Mesh Manufacturing Co., Ltd. specializing in the production of high quality screen mesh and filter mesh, with more than 20 years of production experience, the products throughout the country’s major mining companies and overseas. And get the praise from all the clients.
WUXI JINFENG SILKSCREEN MESH MANUFACTURING CO., LTD.
Since 1996, as professional we manufacture high quality meshes at best price!
Address: Jinxin industrial zone, xibei town, wuxi city, jiangsu province, China 214194
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