Search

Meet the 2019 PPI Awards Winners, Paper360 May/June 2019

Meet the 2019 PPI Awards Winners, Paper360 May/June 2019

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.

Trends in China’s Pulp, Paper, and Forestry Industry, Paper360º March/April 2024

Making a Difference: Meet our 2024 Award Winners, Paper360º May/June 2024

Paper Machine Water Efficiency, Paper360º July/August 2020

Paper Machine Water Efficiency, Paper360º July/August 2020

Invisible Waste in Maintenance Organizations, Paper360º July/August 2020

Invisible Waste in Maintenance Organizations, Paper360º July/August 2020

The European Industry: Plenty of Challenges and Opportunities, Paper360º March/April 2020

The European Industry: Plenty of Challenges and Opportunities, Paper360º March/April 2020

2020 TAPPI/PIMA Awards:, Paper360º May/June 2020

2020 TAPPI/PIMA Awards:, Paper360º May/June 2020

Long-Term or Short-Term Results?, Paper360º May/June 2020

Long-Term or Short-Term Results?, Paper360º May/June 2020

Communicate, Collaborate: Steve Voorhees on Impactful Leadership, Paper360º November/December 2020

Communicate, Collaborate: Steve Voorhees on Impactful Leadership, Paper360º November/December 2020