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Mechanical consequences of coating penetration


Light weight coated papers were evaluated by dynamic mechanical analysis. In addition, water treated papers were studied to separate the contribution from the wetting-drying cycle on the response and thickness of the sheet. Measurements in three-point bending were performed in both the glassy and rubbery regions of the binder. The influence of coating penetration on bending stiffness was determined. At low coat weights, the bending stiffness of the base paper increased linearly. This was attributed to the sandwich structure achieved. As the coat weights continued to increase, the bending stiffness reached a constant value, then began to decrease. The decrease in bending stiffness was determined to be caused by the influences of coating water in the base paper. At higher coat weights, sufficient coating water was present to interfere with fiber-to-fiber bonds and release dried in strains. Variations in coating penetration and coating layer thickness were studied by electron microscopy. The results show the possibility of using dynamic mechanical testing to monitor the depth of coating penetration and thickness of the coating layer.

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Department of Wood and Paper Science, Raleigh, NC. Margaret Joyce is now employed at Western Michigan University, Dept. of Paper and Printing Science, P.O. Box 5060, Kalamazoo, MI 49008-5060.

Stockholm, Sweden.

Stockholm, Sweden.

Margaret Joyce received her Ph.D. from the Department of Pulp and Paper Science at North Carolina State University. After graduating, she visited the Swedish Pulp and Paper Institute of Technology in Stockholm, Sweden. Dr. Joyce is currently working at Western Michigan University in the Department of Paper and Printing Science and Engineering. She is involved in research to examine the affects of coating and ink rheology on print quality and the affects of finishing of the mechanical properties of paper.

Roger Hagen received his Ph.D. from the Department of Polymer Technology at the Royal Institute of Technology in Stockholm. He is currently working at the Swedish Pulp and Paper Institute in the wood and fiber physics group. Dr. Hagen’s current research involves the use of mechanical spectroscopy and dynamic FTIR spectroscopy to understand the relationships between molecular structure and the mechanical properties of polymers.

Alf De Ruvo is Executive Vice President of SCA Research AB, in Stockholm, and head of the SCA’s Corporate Research and Technology Group. Mr. de Ruvo received his M.S. Degree in Nuclear Chemistry and Reactor Technology from the Royal Swedish Institute of Technology. He is a visiting scientist at the State University of New York at Syracuse University. Mr. de Ruvo has published more than 50 articles in various scientific journals and is a member of TAPPI, CPPA, and SPCI. He is also a member of the Royal Swedish Academy of Engineering Sciences.

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Joyce, M., Hagen, R. & de Ruvo, A. Mechanical consequences of coating penetration. Journal of Coatings Technology 69, 53–58 (1997).

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  • Coating Layer
  • Environmental Scanning Electron Microscope
  • Dynamic Mechanical Property
  • Coating Water
  • Base Paper