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A guide to exposure determination and
the impact of artwork
William Shorter
CPS Technical Sales Executive/Product Manager
Objective of this screen printing workshop
Factors to consider with exposure systems
• The quality of the UV
light.
– Wave length:
• Diazo
• Photopolymer
– Avoid Infra Red
• The power of the
light.
– Distance
Factors to consider with exposure systems
• The power of the
light.
– Distance
1.2m
Factors to consider with exposure systems
• Distance from the
stencil.
– 1m = 30 seconds.
– 2m = 900 seconds.
• Angle of the light.
– Diagonal of the
screen.
Increase in exposure time
Factors to consider with exposure systems
• Mesh Colour
White Mesh Yellow Meshvs
Faster Slower
Factors to consider with exposure systems
• Vacuum
– Good seal
– Don’t use white card at
the back
• Integrator or time?
Factors to consider with your artwork
• Quite simply, you can produce bad prints from
good artwork, but you cannot produce good
prints from bad artwork.
Factors to consider with your artwork
• Opaqueness of ink jet
media.
• Must absorb UV light in
the region of 350-420
nanometers.
• Don’t overload ink jet
positives with ink.
• The smallest dot or line
you can print is controlled
by the mesh thread width.
Factors that affect durability
• Optimum Exposure
– An Exposure
Calculator or step
wedge is an important
calibration tool.
– Full exposure is when
all the diazo has cross
linked.
• Indicated by colour
change.
– Brown to purple
– Green to blue
Factors that affect durability on the press
25%Optimum
Exposure
50% Optimum
Exposure
75% Optimum
Exposure
100% Optimum
Exposure
• Masks and positives with poor masking
ability will result in you needing to under
expose the stencil film or emulsion,
compromising the durability and finished
print quality.
CPS Ltd
Chemicals Products and Services
www.cps.eu
cps@cps.eu
T: 01235 773240
F: 01235 771196
Tell Us
What
You Think
Reproduction of any material whether by photocopying or storing in
any medium by electronic means or otherwise is prohibited without
prior written consent of MacDermid Autotype Ltd.
See legal disclaimer notice on www.cps.eu
© 2015. All rights reserved

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A guide to exposure determination and the impact of artwork

  • 1. A guide to exposure determination and the impact of artwork William Shorter CPS Technical Sales Executive/Product Manager
  • 2. Objective of this screen printing workshop
  • 3. Factors to consider with exposure systems • The quality of the UV light. – Wave length: • Diazo • Photopolymer – Avoid Infra Red • The power of the light. – Distance
  • 4. Factors to consider with exposure systems • The power of the light. – Distance 1.2m
  • 5. Factors to consider with exposure systems • Distance from the stencil. – 1m = 30 seconds. – 2m = 900 seconds. • Angle of the light. – Diagonal of the screen. Increase in exposure time
  • 6. Factors to consider with exposure systems • Mesh Colour White Mesh Yellow Meshvs Faster Slower
  • 7. Factors to consider with exposure systems • Vacuum – Good seal – Don’t use white card at the back • Integrator or time?
  • 8. Factors to consider with your artwork • Quite simply, you can produce bad prints from good artwork, but you cannot produce good prints from bad artwork.
  • 9. Factors to consider with your artwork • Opaqueness of ink jet media. • Must absorb UV light in the region of 350-420 nanometers. • Don’t overload ink jet positives with ink. • The smallest dot or line you can print is controlled by the mesh thread width.
  • 10. Factors that affect durability • Optimum Exposure – An Exposure Calculator or step wedge is an important calibration tool. – Full exposure is when all the diazo has cross linked. • Indicated by colour change. – Brown to purple – Green to blue
  • 11. Factors that affect durability on the press 25%Optimum Exposure 50% Optimum Exposure 75% Optimum Exposure 100% Optimum Exposure
  • 12. • Masks and positives with poor masking ability will result in you needing to under expose the stencil film or emulsion, compromising the durability and finished print quality.
  • 13. CPS Ltd Chemicals Products and Services www.cps.eu cps@cps.eu T: 01235 773240 F: 01235 771196 Tell Us What You Think
  • 14. Reproduction of any material whether by photocopying or storing in any medium by electronic means or otherwise is prohibited without prior written consent of MacDermid Autotype Ltd. See legal disclaimer notice on www.cps.eu © 2015. All rights reserved