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TROUBLESHOOTING TYPICAL SCREEN PRINTING PROBLEMS
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Density difference across image in direction of printing stroke.
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Nick in squeegee blade. |
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Sharpen or replace blade.
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Fault/nick on flood/coater blade. |
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Smooth or replace flood bar.
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Nick/scratch on press bed. |
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Smooth out fill in or replace flood bar.
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A run in screen fabric. |
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Re-make stencil on new fabric.
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ink not throughly mixed. |
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Screen out solids and re-mix.
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Ink trailing from squeegee. |
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Adjust viscosity.
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Uneven squeegee pressure. |
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Adjust pressure relative to substrate.
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Areas of differential ink absorption by substrate.
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Poor stock. |
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Change stock. Print clear-coat onto stock first.
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Insufficient ink film. |
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Print thicker ink film. Use coaser mesh.
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Ink too thin/transparent. |
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Increase pigmentation of ink.
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Selective parts of image areas.
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Ink drying in. Ink too thick. |
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Wash out stencil. Thin ink with solvent.
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High ambient temperature. |
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Thin ink with retarder.
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Blunt or soft rubber on squeegee. |
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Use sharper or harder squeegee.
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Second color doesn't completely cover first (second color refusal).
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Too much silicone in first ink down. |
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Change ink.
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Second color too thick. |
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Thin/reduce ink.
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Solvent release from first color through second. |
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Allow first color to dry properly.
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