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Screen Printing – Trouble Shooting Guide

Screen Printing – Trouble Shooting Guide

 

Jagged edges:

➢ Increase mesh count

➢ Increase stencil thickness and reduce Rz value

➢ Properly control the exposure time of the emulsion.

 

Fray edge

➢ Appropriately reduce the thickness of the stencils

➢ Change to a higher mesh count.

 

pinhole

➢ Replace the screen with a large opening

 

Screen Printing Problems and Solutions

Poor adhesion:

➢ The cure time is too short, and the ink is not fully cured

➢ The selected ink series does not match the substrate

➢ Curing agent type/ratio/mixing issues

➢ Material surface is dirty/unevenly treated

 

Uneven color:

➢Ink mixing insufficient

➢Ink viscosity not suitable

➢Printed ink film thickness uneven (printing parameters/scraping scars/scraping pressure uneven/printing surface uneven/ink dripping during printing, etc.)

➢Incompatible solvent or pigment layering added to ink

➢Screen effect (Fray edge/blocking screen)

➢Poor sticking/lifting plate

 

Surface Tension Too Low:

➢ The surface tension of the printing substrate is too low or the tension is uneven/grease contamination

➢ Ink viscosity is too low

➢ Silicon-free ink does not match the underlying ink (containing silicon)

➢ The thickness of the ink layer is too thin

 

Bubbles on the printing substrates:

➢ Ink viscosity is too high

➢ Fast drying solvent effect

➢ Insufficient addition of ink defoamer

➢ Printing speed is too fast

➢ The screen distance is set too low and the plate release is abnormal

 

Pin Hole:

➢Screen defects

➢Debris/dust blocking screen

➢Foreign matter on substrates

➢Ink particle size and screen mesh matching issues

➢Poor ink leveling

 

Orange peel:

➢ Low surface tension or uneven tension in the printing substrate

➢ Ink viscosity too high

➢ Ink flow leveling not good

➢ Effect by Fast Thinner

➢ Effect by mesh counter

 

Sawtootth on edges:

➢ Influence of mesh counter

➢ Effect by tensioning angle of the mesh

➢ Stencils layer thickness too thin (20% mesh thickness)

➢ Poor flow leveling due to high ink viscosity

➢ Printing on abrasive materials surface

 

 

 

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