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Surface energy considerations for offset printing of coated paper and paperboard, TAPPI Journal November 2023
ABSTRACT: Offset printing of coated paper involves the complex interactions of ink with a surface that is characterized by three major properties: roughness, porosity, and related pore network structure and surface chemistry (related to surface free energy [SFE]). The effects of porosity and roughness are relatively well understood and are documented in the literature, whereas the influence of surface chemistry is much less studied and therefore the focus of this paper. The key results shown include: i) Coating porosity has a negligible effect on SFE determination by contact angle using two fluids. ii) The chemistry of the latex polymer in the coating formulation dominates the influence on SFE compared to pigment, with any surface energy differences present in the pigment being almost completely masked by latex. iii) Wetting agent and corona treatment can impact water absorption rate and surface spreading of water, resulting in small differences in printability. Increasing the concentration of the surfactant on a coated surface indicates switching orientation of the surfactant molecules, giving a “step wise” printing result. When looking to improve offset printability by selection of different pigments, the variation in SFE is less important than variation in either surface roughness or porosity.
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Communicate, Collaborate: Steve Voorhees on Impactful Leadership, Paper360º November/December 2020
Communicate, Collaborate: Steve Voorhees on Impactful Leadership, Paper360º November/December 2020
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Uruguay Prepares to Open a Gateway to the World, Paper360º July/August 2021
Uruguay Prepares to Open a Gateway to the World, Paper360º July/August 2021
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The Paper360° 2021 TOP 50 POWER LIST, Paper360º July/August 2021
The Paper360° 2021 TOP 50 POWER LIST, Paper360º July/August 2021
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An Ode to Small, Paper360º May/June 2017
An Ode to Small, Paper360º May/June 2017
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Suppliers Reach Out to Mill Leaders, Paper360º May/June 2017
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The PPI Top 100, Paper360º September/October 2017
The PPI Top 100, Paper360º September/October 2017
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RISI's North American CEO of the Year, Paper360º November/De
RISI's North American CEO of the Year, Paper360º November/December 2016
Journal articles
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Pulp in a Frenzy, Paper360º, January/February 2018
Pulp in a Frenzy, Paper360º, January/February 2018
Journal articles
Magazine articles
RISI's Top 50 Power List, Paper360º July/August 2018
RISI's Top 50 Power List, Paper360º July/August 2018