What causes ink film edge defects?
In glass screen printing products, a common problem is the appearance of jagged burrs (including incomplete or broken lines) on the edge of the printed ink film. There are many reasons for the burrs, but the main reason is the quality problem of the screen printing plate itself.
(1) Low photoresist resolution causes fine lines to break or become incomplete.
(2) Inadequate exposure time or excessively long exposure leads to irregular and copper-like edges.
(3) Insufficient development results in uneven image edges.
(4) Uneven photoresist coating creates gaps between the screen and the substrate, causing ink to seep through and form burrs.
(5) The screen film swells unevenly upon contact with solvents, leading to gaps and further printing defects.
(1) Low photoresist resolution causes fine lines to break or become incomplete.
(2) Inadequate exposure time or excessively long exposure leads to irregular and copper-like edges.
(3) Insufficient development results in uneven image edges.
(4) Uneven photoresist coating creates gaps between the screen and the substrate, causing ink to seep through and form burrs.
(5) The screen film swells unevenly upon contact with solvents, leading to gaps and further printing defects.
In order to prevent steel tooth-like rough carving, what aspects can be considered?
① Choose a high-mesh wall screen negative plate.
② Choose high-resolution photosensitive materials for plate making; choose bridge-type photosensitive adhesive with good resolution.
③ Make a screen printing plate with a certain photosensitive adhesive film thickness to reduce expansion and deformation.
④ You can also use the oblique stretching method to make the screen; the best angle is 22.5°.
⑤ For fine line printing, you can also use the indirect plate-making method because the possibility of burrs in the indirect plate-making method is slighter.
⑥ During the plate-making and printing process, try to control the temperature expansion factor and use photosensitive materials with a small expansion coefficient.
⑦ Improve the quality of plate making; ensure that the surface of the screen printing plate is flat and smooth, and the edges of the screen lines should be neat.
⑧ Use a water spray gun to spray the screen printing plate to improve the development effect.
⑨ The distance between the screen and the glass, the angle of the scraper, and the printing pressure should be appropriate.
② Choose high-resolution photosensitive materials for plate making; choose bridge-type photosensitive adhesive with good resolution.
③ Make a screen printing plate with a certain photosensitive adhesive film thickness to reduce expansion and deformation.
④ You can also use the oblique stretching method to make the screen; the best angle is 22.5°.
⑤ For fine line printing, you can also use the indirect plate-making method because the possibility of burrs in the indirect plate-making method is slighter.
⑥ During the plate-making and printing process, try to control the temperature expansion factor and use photosensitive materials with a small expansion coefficient.
⑦ Improve the quality of plate making; ensure that the surface of the screen printing plate is flat and smooth, and the edges of the screen lines should be neat.
⑧ Use a water spray gun to spray the screen printing plate to improve the development effect.
⑨ The distance between the screen and the glass, the angle of the scraper, and the printing pressure should be appropriate.
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