Screen Printing Machine Troubleshooting: Causes & Fixes

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Problems on this page:

Pinholes or missing areas in the print Print smearing or bleeding Registration out on multi-colour prints Ink not curing or drying Screens tearing or losing tension Squeegee wear Vacuum table not holding the substrate Long job changes

Pinholes or missing areas in the print

Hits OEE: Quality

Symptoms: Printed areas show small holes, gaps or skipped detail.

Screen mesh blocked by dried ink

Clean the screen and check how long the ink sits open between prints.

Stencil damaged or emulsion breaking down

Inspect the stencil against light and remake it if it is damaged.

Squeegee pressure or angle wrong

Set the squeegee pressure and angle as the job record states.

Dust or fibres on the substrate

Clean the substrate and check the room for dust sources.

Prevention: First print checked against the approved proof at every start.

Print smearing or bleeding

Hits OEE: Quality

Symptoms: Edges are blurred or ink spreads beyond the image.

Off-contact distance too small

Set the gap between screen and substrate so the screen lifts cleanly.

Ink too thin

Check the ink viscosity and the amount of thinner.

Too much flood ink

Reduce the flood stroke.

Substrate moving during the print

Check the vacuum table or fixture holding it.

Prevention: Print edges checked under magnification on samples.

Registration out on multi-colour prints

Hits OEE: Quality

Symptoms: Colours do not line up on multi-colour jobs.

Screens not locked in the same position

Check the screen clamps and registration pins.

Substrate stretching or shrinking between colours

Check drying temperatures between colours.

Mesh tension different between screens

Measure mesh tension and keep it within the same range.

Print table indexing worn

Check the table indexing for play.

Prevention: Registration checked on the first print of each colour.

Ink not curing or drying

Hits OEE: Quality

Symptoms: Prints stay tacky, set off onto the next item or fail rub tests.

Dryer or UV lamp output low

Check the dryer temperature or the UV lamp intensity.

Belt speed too fast through the dryer

Match the belt speed to the curing time the ink needs.

Ink film too thick

Check the mesh count and squeegee settings.

Wrong ink for the curing method

Check the ink data sheet.

Prevention: Cure tested on samples each shift.

Screens tearing or losing tension

Hits OEE: Availability

Symptoms: Screens tear or go slack during production.

Mesh tensioned too high

Tension the mesh to the supplier value for that mesh.

Squeegee edge damaged

Check the squeegee edge for nicks.

Screens cleaned with harsh chemicals

Use the cleaning chemicals the mesh supplier approves.

Frames bent

Check frames for flatness.

Prevention: Mesh tension measured when screens are prepared.

Squeegee wear

Hits OEE: Quality

Symptoms: The print becomes uneven as the squeegee wears.

Squeegee edge rounded

Sharpen or replace the squeegee on a set schedule.

Squeegee swelling from solvent

Check the blade material against the ink solvents.

Pressure set too high

Use the lowest pressure that clears the screen.

Squeegee not parallel to the screen

Check the squeegee holder alignment.

Prevention: Squeegee condition checked at every job start.

Vacuum table not holding the substrate

Hits OEE: Availability

Symptoms: Sheets or parts move during the print.

Vacuum pump weak

Check the vacuum pump output and clean or replace its filter.

Holes outside the print area not masked

Mask unused holes so vacuum holds the substrate.

Table holes blocked

Clean the table surface and clear blocked holes with the vacuum off.

Hose leaks

Check the vacuum hoses and connections for cracks and loose clips.

Prevention: Table vacuum checked at job start.

Long job changes

Hits OEE: Performance

Symptoms: Changing jobs takes long because screens and inks are prepared late.

Screens not ready when the job starts

Prepare and check screens before the previous job ends.

Ink colour matched at the machine

Match colours in the ink kitchen ahead of the job.

No settings recorded

Record off-contact, squeegee and flood settings per job.

Registration found by trial

Use a pin registration system for the screens.

Prevention: Job change time recorded.

Guidance only. Always follow lockout/tagout and your site's safe-work procedures, and verify against OEM manuals before acting.

Related equipment guides: pad printing machine · offset press · flexo press · industrial oven · vision inspection · hot foil stamping machine

Stop the same fault coming back

Recurring screen printing machine stops usually trace to a cause you cannot see by hand. The partner we recommend is Fabrico: it tracks OEE and downtime live from PLCs, IoT sensors or AI cameras; where cameras are fitted, the video of a stop sits next to its machine data so the cause can be reviewed; and a technician opens the work order from the stop in the same system. Data is hosted in the AWS EU region, and Fabrico and the company behind it hold ISO/IEC 27001, ISO/IEC 20000-1 and ISO 9001.

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Methods that cut recurring stops: the six big losses · root cause analysis · preventive vs predictive maintenance · TPM · SMED & changeover