Submitted by: Submitted by tengkunisa
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Date Submitted: 04/26/2014 11:05 PM
6/20/12
Fundamentals of Ink and Toners
INTRODUCTION
Overview
• Ink Formulation
– Ingredients – Manufacturing
• Rheology • Drying and setting methods • Inks and printing processes • Trouble shooting
What can go wrong?
• Ink fails to dry • Dry while still on-press • Attack plate material • Not adhere to the substrate • Bad image quality
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Two main reasons
• Using wrong ink for a particular process • Adding components to an ink without understanding the outcome
Basic Consideration in Choosing the Correct Ink I
• Type of press • Ink drying system • Drying time and requirements • Running speed • Required color • Color sequence
– Order of printing the colors
Basic Consideration in Choosing the Correct Ink II
• Tack, and tack sequence
– Amount of force required to split an ink film
• Type of substrate
– Paper or board, uncoated, plastic, film,…
• Desired finish • Dampening solution to be used
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Basic Consideration in Choosing the Correct Ink III
• End-use requirements
– Product resistance, lightfastness, rub resistance, etc.
• • • •
Safety and environmental requirements Ink mileage Delivery requirements Price
Ink Formulation
• Economic • Environmental • Printing process • Drying method • Substrate • End user requirements
How Important are End User Requirements?
• A newspaper, a bumper sticker, and a metal can are all to be printed by offset lithography • The inks used must be very different, even though the process is the same in all cases
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End-Use Requirements: Newspaper
• Read once, then thrown away • Must be very inexpensive
End-Use Requirements: Bumper Sticker
• Will be outside, therefore must be waterresistant • Will be outside, therefore must be lightfast • Cannot dry by absorption (non-absorbant stock)
End Use Requirements: Metal Decorating
• Will be rolled, welded, banged around, frozen, baked, etc. • A very...