Prague
Prague
120 00
Czechia
Screen printing masks
Screen masks, mesh masks, screens, mlcc printing, ltcc printing, touch panel printing
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Screen printing masks
Screen printing mask can be used as an effective tool for production of various electronic components ranging from bio sensors, MLCC capacitors, LTCC ceramic chips, RFID chips, solar cells, printed circuit boards, touch panels, hybrid IC, semiconductor wafers up to large products such as LCD or PDP screens.
Each application requires different conditions. As for the screen mask manufacturing process, the most important factors that influence the screen printing process are:
pattern size vs. frame size (fine pattern printing max. 30% of the frame size)
screen mesh type (mesh weave, mesh count, material, wire diameter, angle bias, etc.)
photosensitive emulsion (emlusion type, emulsion thickness, exposure time, etc.)
frame type (aluminium die casted, aluminium extruded, ceramic type, etc.)
mesh attaching system (direct mesh to frame or trampoline/combination mask)
However quality of the final print is dependent not only on the screen mask, but also on many other important factors related to the screen printing machine, screen printing paste, squeegee, substrate type and other printing process variables. In total, screen printing quality is greatly affected by individual combination of many variables which needs to be properly adjusted to each application.
Trampoline mask
Trampoline mesh maskScreen mask used for a fine pattern printing is a combination of a high quality materials and precise manufacturing process. Due to the high strength and low elongation of the steel woven wire mesh, our fine screen masks mainly use various types of stainless steel mesh in combination with aluminum frames and our own engineered photo emulsions.
In order to preserve dimensional accuracy and long lifetime, hard steel mesh is used only in the center of the screen. Mask is manufactured as a trampoline mask, or so called combination mesh. Outer side of the mesh acts as a support to absorb the major part of the stress forces caused by the screen printing process, usually a polyester mesh.
Fine screen printing requires the mesh thread diameter to be small, which can influence the strength and dimensional stability of the screen. State of the art Japanese mesh products with high mesh count (500+) and exceptional strength can be used in todays mass production process to print very precise pattern of L/S = 20/20 µm with minimal pattern distortion.
screen-20um
L/S = 20/20 µm
screen-10um
L/S = 10/10 µm
Black screen mask
Definition of the pattern can be further improved by using a surface treated stainless steel mesh. Additional chemical process makes black surface on the mesh thread which reduces random reflection of light during the exposure process, resulting in better adhesion of the emulsion, higher definition of the pattern and very smooth aperture walls for the best possible paste flow.
Black screens provide superior results in straight pattern printing, improving fine line definition and reducing overall dimensional tolerances (e.g. 20µm ± 2µm). This chemical treatment is widely used with calendered screen mesh for stable fine pattern printing in mass production process.
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