Screen selection we need to pay attention to what
Introduction to the characteristics of nylon screen printing Mesh
Nylon mesh has smooth surface, good ink permeability, softness, elasticity, strong adaptability, good tensile strength, elasticity and frictional resistance, large nodules fastness, long service life, acid, resistance to chemicals and many organic solvent superior performance characteristics, thus get the favour of fine printing, in fine line drawing design and site is widely used in printing.
Precautions for use:
In addition to the advantages of nylon wire mesh, but also has some disadvantages, such as elongation, low heat resistance, etc., so in making nylon wire mesh should pay attention to the following points:
· due to the high elongation of nylon wire mesh, it is required to use strong mesh frame and stretching machine in printing;
· in view of the disadvantages of low heat resistance of nylon wire mesh, so do not use the hot-melt method to fix the screen in printing;
· ultraviolet light will also have some impact on the nylon wire mesh, so in the custody of nylon wire mesh or its corresponding screen version should pay attention to avoid light.
2. Selection of screen frame
Press material, net frame has wooden frame, aluminous frame, iron frame, plastic frame, stainless steel frame, copper frame 6 kinds commonly used, have wooden frame, aluminous frame, iron frame to wait.
· wooden frame: the price is relatively cheap and the production is convenient. It can be manually stretched and mechanically stretched. However, its disadvantages include low strong filling and easy deformation.
· iron frame: compared with wood frame, it has the characteristics of stable size and durability, but its weight, easy to rust, it is less convenient to use, and only mechanical tension network can be used.
· aluminum frame: although it is only suitable for mechanical tension net, it has the characteristics of small deformation, light volume, not easy to rust, and easy to move. Therefore, aluminum frame is the most commonly used screen frame in printing and plate making.
Wire net hole opening for mesh opening selection focuses on two aspects, on the one hand is the screen open uniform consistency, can take advantage of the high power magnifying glass to look at the screen of the openings, the ideal screen openings for the square and uniform size, low quality of the wire net hole openings will appear inconsistent irregular shape and size;Is the size of the mesh opening on the other hand, when using some special ink particles is larger, in order to satisfy the ink printing eligibility, must want to silk net hole opening size into consideration, the opening of the mesh size is three times the ink solid particles on the glass surface of the stability of the large area ground color piece of ink printing screen tension relatively request is not high, the products of printing is mainly two aspects: wire mesh and wire diameter, if too thick wire mesh count and wire diameter, as the glass surface after printing ink has no absorbent, is not conducive to ink surface smooth level off, leave a silk screen ink film surface imprinting;Carefully, if the screen mesh and wire diameter when printing ink layer thickness, is difficult to guarantee the process when it can only rely on by increasing the thickness of the photographic film to increase after the printing ink layer thickness, printing ink layer too thin, after covered the force not guaranteed of ink, according to our many years of production experience, in the glass surface printing color piece on the ground, the number of wire mesh to 180 mesh and wire diameter of 50 mm, for 91 mm screen printing effect is best.
In order to choose suitable for their own screen, the screen of technical parameters and performance indicators to consider this is only one aspect, on the other hand, we also want to consider the minimization of production costs, in order to meet the customer's requirements for printing quality, choose from a number of screen more affordable screen.
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