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A guide to selecting the correct
emulsion
William Shorter
CPS Technical Sales Executive/Product Manager
Objective of this workshop
• An overview of the emulsion types
available to screen printers of garments,
bags and textiles. Plus an opportunity to
explore and understand how key
processing steps can affect the
performance of these emulsions.
Stencil Making Process
Choosing Your Emulsion
Emulsion
Options
Ink Types
Plastisol Silicone Water Based Discharge
Diazo Short Run
Lengths
Dual Cure
Photopolymer Water
Reistant
Short Run
Lengths
Photopolymer
+ Diazo (Dual
or Triple Cure)
Diazo Types
#ScreenPrintingTopTip: Sensitise the emulsion at least 24 hours before it is
needed in production to allow the Diazo to dissolve completely and for the
emulsion to de-aerate.
Factors to consider with mesh
• Mesh Colour
White Mesh Yellow Meshvs
Faster Slower
Coating
• Always degrease mesh.
• Start on the print side and
finish on the squeegee
side.
• Angle of 15 to 30
degrees.
• Coat slowly especially on
coarse mesh
Correct Drying
35°C, 10% RH
#ScreenPrintingTopTip: Don’t dry screens from the stencil reclaim
area with coated screens.
#ScreenPrintingTopTip: Drying screens at 40°C or greater can
start the cross linking process of diazo.
Factors that affect durability on the press
25%Optimum
Exposure
50% Optimum
Exposure
75% Optimum
Exposure
100% Optimum
Exposure
Post Exposure
• Effective on
photopolymer
emulsions.
• Not very effective on
diazo and dual cure
emulsions.
• Optimum exposure is
the key.
Summary
• Chose an emulsion designed for textile
screen printing and the ink types that you
are using.
• Get the processing steps correct and the
emulsion will be durable and produce the
print quality that you require.
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 selecting the correct emulsion

  • 1. A guide to selecting the correct emulsion William Shorter CPS Technical Sales Executive/Product Manager
  • 2. Objective of this workshop • An overview of the emulsion types available to screen printers of garments, bags and textiles. Plus an opportunity to explore and understand how key processing steps can affect the performance of these emulsions.
  • 4. Choosing Your Emulsion Emulsion Options Ink Types Plastisol Silicone Water Based Discharge Diazo Short Run Lengths Dual Cure Photopolymer Water Reistant Short Run Lengths Photopolymer + Diazo (Dual or Triple Cure)
  • 5. Diazo Types #ScreenPrintingTopTip: Sensitise the emulsion at least 24 hours before it is needed in production to allow the Diazo to dissolve completely and for the emulsion to de-aerate.
  • 6. Factors to consider with mesh • Mesh Colour White Mesh Yellow Meshvs Faster Slower
  • 7. Coating • Always degrease mesh. • Start on the print side and finish on the squeegee side. • Angle of 15 to 30 degrees. • Coat slowly especially on coarse mesh
  • 8. Correct Drying 35°C, 10% RH #ScreenPrintingTopTip: Don’t dry screens from the stencil reclaim area with coated screens. #ScreenPrintingTopTip: Drying screens at 40°C or greater can start the cross linking process of diazo.
  • 9. Factors that affect durability on the press 25%Optimum Exposure 50% Optimum Exposure 75% Optimum Exposure 100% Optimum Exposure
  • 10. Post Exposure • Effective on photopolymer emulsions. • Not very effective on diazo and dual cure emulsions. • Optimum exposure is the key.
  • 11. Summary • Chose an emulsion designed for textile screen printing and the ink types that you are using. • Get the processing steps correct and the emulsion will be durable and produce the print quality that you require.
  • 12. CPS Ltd Chemicals Products and Services www.cps.eu cps@cps.eu T: 01235 773240 F: 01235 771196 Tell Us What You Think
  • 13. 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