1 line distortion
Excessive number of silk screens, caused by the looseness of the screen stencil; Locating the distance between the screen plate and the substrate; Locating the angle between the squeegee and the substrate or using uneven force; The thickness of the printed material is too thin or too dry; The surface of the printing surface is washed and the solvent is finally dried.
2 pattern or line hair
Ink mix is ​​too thin, excessive force is applied during squeegee printing; printing material is unevenly distributed (the solvent in the printing material is unevenly dispersed); the solvent or cleaning agent is not dried on the screen after the retort, or the surface is cleaned when the workpiece is reworked. The agent is not dry or not clean; after the first squeegee printing, the sealing force of the printing material is too large, so that a small amount of printing material squeezes out the mesh; the speed of the squeegee movement (moving) in the printing is greatly different within the effective area of ​​the printing material. , pauses in the middle or repeat printing; the fineness of the printed material is not compatible with the number of screen meshes selected.
3 pattern line side burrs, notches, cams, etc.
Substrate surface is not clean, and there is oil; printing material is too sticky, dirt is not removed on the screen, printed material particles are large, high mesh number can not pass through; screen printing drying speed is too fast, screen printing workplace ventilation; quick-drying The printing material fails to close the net in time, resulting in netting; the force is uneven when scraping, or larger or smaller; the surface of the substrate is not even.
4 pits
The printing material is too sticky and has impurities or plugging holes; or the printing material is too sticky, and the squeegee force is insufficient; the printing material is not mature enough during deployment, the residual bubbles in the printing material are not run clean, and the bubbles are stained on the printing material after screen printing The surface of the substrate is not clean, dust and other influences, improper printing force, light uneven or squeegee, lack of force; printing material on the substrate is not dry, storage place dust; printing materials under the right conditions, screen and The distance between substrates is too large; pre-press screen cleaning is not complete.
5 screen printing sticky screen
There is a problem between the scraped plate and the substrate. There is a problem between them, not a line contact, but a small plane contact; the distance between the screen plate and the substrate is small, or the tension of the screen plate is small; when the screen printing, the stamping force is too large, Thick ink sticky network; printing material is too thick and so on.
6 solutions
Careful analysis of the reasons for the impact of quality, to solve the causes, as to the non-squeegee quality problems, such as stretching problems, the best distance, the problem of screen printing stencils, surface processing problems and the selection of printing materials And so will affect the quality of screen printing.
Excessive number of silk screens, caused by the looseness of the screen stencil; Locating the distance between the screen plate and the substrate; Locating the angle between the squeegee and the substrate or using uneven force; The thickness of the printed material is too thin or too dry; The surface of the printing surface is washed and the solvent is finally dried.
2 pattern or line hair
Ink mix is ​​too thin, excessive force is applied during squeegee printing; printing material is unevenly distributed (the solvent in the printing material is unevenly dispersed); the solvent or cleaning agent is not dried on the screen after the retort, or the surface is cleaned when the workpiece is reworked. The agent is not dry or not clean; after the first squeegee printing, the sealing force of the printing material is too large, so that a small amount of printing material squeezes out the mesh; the speed of the squeegee movement (moving) in the printing is greatly different within the effective area of ​​the printing material. , pauses in the middle or repeat printing; the fineness of the printed material is not compatible with the number of screen meshes selected.
3 pattern line side burrs, notches, cams, etc.
Substrate surface is not clean, and there is oil; printing material is too sticky, dirt is not removed on the screen, printed material particles are large, high mesh number can not pass through; screen printing drying speed is too fast, screen printing workplace ventilation; quick-drying The printing material fails to close the net in time, resulting in netting; the force is uneven when scraping, or larger or smaller; the surface of the substrate is not even.
4 pits
The printing material is too sticky and has impurities or plugging holes; or the printing material is too sticky, and the squeegee force is insufficient; the printing material is not mature enough during deployment, the residual bubbles in the printing material are not run clean, and the bubbles are stained on the printing material after screen printing The surface of the substrate is not clean, dust and other influences, improper printing force, light uneven or squeegee, lack of force; printing material on the substrate is not dry, storage place dust; printing materials under the right conditions, screen and The distance between substrates is too large; pre-press screen cleaning is not complete.
5 screen printing sticky screen
There is a problem between the scraped plate and the substrate. There is a problem between them, not a line contact, but a small plane contact; the distance between the screen plate and the substrate is small, or the tension of the screen plate is small; when the screen printing, the stamping force is too large, Thick ink sticky network; printing material is too thick and so on.
6 solutions
Careful analysis of the reasons for the impact of quality, to solve the causes, as to the non-squeegee quality problems, such as stretching problems, the best distance, the problem of screen printing stencils, surface processing problems and the selection of printing materials And so will affect the quality of screen printing.
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