Silk screen is used as a screen printing plate support woven fabric, commonly known as silk screen, silk screen, yarn screen, screen, etc.Screen printing screen commonly used natural screen, synthetic screen, metal screen, special screen, etc.Screen performance such as material, mesh number, degree of opening, opening rate has a great impact on the transfer of screen printing ink, according to the different copy of the original, choose the appropriate screen is the premise of obtaining high-quality screen printing copy.
Screen printing the most common materials are silk screen, nylon (polyurethane) screen, polyester (polyester) screen, stainless steel screen.Today we will understand the different materials of the screen in printing what characteristics, what advantages and disadvantages, different characteristics apply to what substrate.
1. Natural silk screen
Natural silk screen also known as silk screen, silk net, silk screen.
Silk screen water resistance has a certain degree of moisture absorption, tension network operation is simple, and photosensitive glue has a good combination.However, its wear resistance and chemical resistance is poor, will be easy to aging brittle, stretch the network when it is difficult to achieve higher tension.Printing resistance is not strong, the cost is high, now less consumption, most of the synthetic fiber screen has been replaced.
2. Nylon mesh
Nylon wire mesh also known as nylon screen
Is a nylon monofilament fabric, woven after the heat resistance, dimensional stability.Plain weave up to 380 and twill weave more than 330 mesh.Nylon wire mesh has some characteristics, the surface of the nylon wire mesh is smooth, ink permeability is good, you can use large viscosity and large particles of ink, so you can get fine printing patterns;The fine mesh net woven with very fine wire is suitable for the drawing patterns and dot printing of very fine wire.Good tensile strength, nodule fastness, elasticity and friction resistance, long service life;Good acid, chemical and organic solvent resistance, easy to reuse, especially strong resistance to alkali.
The use of nylon wire mesh should pay attention to the problem is, nylon wire mesh and polyester, silk mesh, its elongation rate is large, in order to inconvenience its printing fault, to increase tension tension, then the contraction force will become larger, therefore, the use of a large strength of the mesh frame and tension machine;And because of its low heat resistance, if through the hot melt method will be fixed on the frame, from the operational aspect it is difficult;Not resistant to strong acid and other erosion;Ultraviolet radiation has a slight effect on it, so please avoid the light when keeping it.
(3) polyester silk mesh
Polyester mesh also known as polyester mesh.
Polyester yarn mesh has some characteristics of small tensile elongation, strong elasticity, single wire mesh is suitable for printing integrated circuit, thick film semiconductor, calibration plate, count plate and other high-precision printing.Tensile strength, structural strength, resilience and resistance to printing are good.It has enough drug resistance, especially strong acid resistance and strong organic solvent resistance. It is as renewable as nylon.Low hygroscopicity, almost not affected by humidity;The heat resistance is higher than that of nylon and is less affected by ultraviolet radiation.
The use of polyester screen size stability should be noted is good, suitable for high precision printing, so the need for a larger than the nylon wire mesh tension, the need for greater strength of the frame, tension screen machine and more firm adhesion.Polyester due to hydrophobicity, and the film is more difficult to adhere to the plate, to pay attention to the plate before washing, degreasing;Although the hygroscopicity is low, but does not endure long time boiling water: over ink than nylon slightly worse;Not resistant to strong alkali erosion, woven in twill weave.
(4) wire mesh
The plane stability of stainless steel wire mesh is very good, the production of graphics size is stable, suitable for printing high-precision circuit board
Product;Ink through the performance of excellent;Good alkali resistance and tensile strength;Excellent chemical resistance;Strong heat resistance, suitable for hot melt printing material (heating on the screen to melt the printing material).Stainless steel wire mesh is first used in the glass processing industry, the reason is that the wire mesh can be electrification flow, by changing the temperature can be on the glass for two-color printing, so the stainless steel wire mesh can be rapidly developed.With the development of weaving technology and monofilm manufacturing, the stainless steel wire mesh can be woven into 500 mesh and the thread thickness is up to 50 meters.Therefore, in the electronic industry printed circuit board, integrated circuit and other printing in a lot of use of this screen.Due to the stability of the mechanical properties of the thread as well as the chemistry
Stable performance, no uneven weaving and weaving scars, so it is very suitable for precision printing.There are two knitting methods: plain weave and twill weave.Its disadvantage is that it is easy to be subjected to external force twists and turns and damage, printing process is easy to be due to pressure and make the mesh slack, affecting the printing resistance, high price, high cost.
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