MINI GUIDE - Preparation of a Direct Stencil

🎯 Learn how to achieve a perfectly calibrated, stable, and durable direct stencil. Each step — from degreasing to UV exposure — affects the stencil's strength and precision.

KEY VARIABLES

Process Parameters

Parameter	Value	Notes
Drying temperature	68–77°F	Avoid thermal shocks during drying.
Relative humidity	40–50%	Essential for emulsion uniformity.
UV exposure time	60–120 seconds	Depends on emulsion type and lamp power.

3 GOOD HABITS

Always degrease the mesh before coating.

Dry in a clean, dust-free, yellow-light area.

Record every cycle in a stencil control log.

OPERATIONAL CHECKLIST

Essential Controls

Check	Frequency	Responsible	Action if Not Compliant
Mesh cleanliness post-degreasing	Every stencil	Pre-press Operator	Repeat degreasing until completely clean.
Emulsion uniformity	Every stencil	Pre-press Operator	Check thickness, reapply if necessary.
UV exposure time	Every batch	Pre-press Technician	Calibrate timer and verify lamps.
Development quality	Every stencil	Pre-press Operator	Verify image area opening.

BASIC INDICATORS

Performance Targets

Indicator	Target
Stencils rejected for defects	< 2%
Average preparation time	30–45 minutes
Average stencil life	500–1000 passes
Emulsion thickness uniformity	± 0.08 mil

USEFUL TIPS

Best Practices

Tip	Benefit
Always use fresh emulsions stored correctly.	Greater stencil stability and resistance.
Maintain yellow lighting during photosensitive phases.	Prevents accidental premature exposures.
Perform periodic exposure tests (step wedges).	Optimal UV time calibration.
Record parameters of each stencil produced.	Process traceability and repeatability.

💡 REMEMBER

"The quality of the stencil is born from consistency. Every degree, every second, every micron matters."

👉 Explore the BASIC – ADVANCED – PROFESSIONAL guides of the Master Map of Screen Printing for complete process control.

NOTES

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