Ink as a Substrate

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Ink as a Substrate in Flexible Packaging
Laminations

Presented by Bruce Foster Mica Corporation
IOPP Technical Bag Committee Winter 2013 Meeting
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Better Understand Effects of

• Ink Type (polymer base)
• Ink Color

Objective
On Adhesion in Extrusion Laminations
(with PRIMERS, of course!)
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12-micron polyester film 1-side factory treated

• Inks solvent-based, toluene-free
• 3 chemistries
• Vinyl-modified polyurethane
• Modified-polyamide
• Modified-polyurethane

Materials
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12-micron polyester film 1-side factory treated
Inks 3 chemistries

• Primers Water-Based
• 2 chemistries
• Polyethylene-imine
• Polyurethane

Materials
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Lab Experiments Set I

• Ink draw-downs on polyester film
• Different types colors

• Prime over printed samples
• Polyethylene-imine based extrusion primer

Approach

• Extrusion-coat on lab pilot line
• High-temperature polyethylene

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Lab Experiments Set I
40-micron polyethylene _at_ high temperature
Approach
primer
ink
12-micron polyester film (corona-treated)
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Ink lift-off
12-micron polyester film (corona-treated)
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All Samples - Ink lift-off
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Ink Splits
Ink lift-off
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Lab Experiments Set I

• Modified Polyamide Inks had best adhesion to
  polyester film

• Polyethylene-imine primer works with all inks
  tested

Learnings
3. White inks had lowest adhesion to films
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Lab Experiments Set II

• Pre-prime polyester film
• Both imine and urethane primers

• Print over primed samples
• Vinyl-modified polyurethane inks

Approach

• 3. Prime over printed samples
• Both imine and urethane primers

• 4. Extrusion-coat on lab pilot line
• High-temperature polyethylene

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Lab Experiments Set II
40-micron polyethylene _at_ high temperature
Approach
primer
Vinyl-modified polyurethane inks
primer
12-micron polyester film (corona-treated)
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Results Set IIa
Pre-Primer InkColor Post-Primer Bonds,g/25mm Failure Mode
Imine White Imine gt500 Inseparable
Imine Blue Imine 400 Film Tear
Imine White on blue Imine 93 Ink lift-off
Imine White Urethane 400 Film Tear
Imine Blue Urethane gt500 Inseparable
Imine White on blue Urethane gt500 Inseparable
Results
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Results Set IIb
Pre-Primer InkColor Post-Primer Bonds,g/25mm Failure Mode
Urethane White Imine 200 Ink lift-off
Urethane Blue Imine gt500 Inseparable
Urethane White on blue Imine gt500 Inseparable
Urethane White Urethane 170 Ink lift-off
Urethane Blue Urethane gt500 Inseparable
Urethane White on blue Urethane gt500 Inseparable
Results
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Lab Experiments Set II

• Pre-priming works for vinyl-modifed polyurethane
  inks!

• Both primer chemistries gave mostly good results

Learnings
3. Polyethylene-imine pre-primer was best for
white ink adhesion
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Lab Experiments Set I

• Modified Polyamide Inks had best adhesion to
  polyester film

Learnings

• Polyethylene-imine primer works with all inks
  tested

3. White inks had lowest adhesion to films
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P.T. Colorpak Indonesia, Tbk.
Jonida Gjika Lab Chemist
Mica Corporation
Thanks
TAPPI PLACE
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Thanks, for your attention!
Questions?
Bruce Fosterbfoster_at_mica-corp.com