Comparative study of coating structural characteristics of light weight coated papers by spray and MSP coating methods, 2012 Advanced Coating Fundamentals Symposium

Please Note: This document will be available in PDF format in the "My Electronic Documents" link on the home page once your order has been completed. Please make sure you have the latest version of Acrobat Reader. Click on the Acrobat Reader icon to check for the latest version, it’s FREE. To print a hardcopy of a PDF file correctly you must have a postscript printer. If you are not sure if your printer is a postscript printer please refer to your owner’s manual.

Purchase of electronic (downloadable) documents made at www.tappi.org by credit cards, followed by instant download CANNOT be cancelled. We do not offer refunds on electronic download documents.

In this study, the surface and bulk coating structures of spray and MSP coated papers were examined using a combination of scanning electron microscopy (SEM) and image analysis techniques. The following surface coating structural characteristics were quantified: pore structure, binder coverage, pigment coverage, overall coating coverage, and roughness. Bulk coating structure attributes such as pore structure, binder penetration, pigment penetration, coating layer thickness, and coating layer thickness variability were determined. Paper samples had three sets of coating formulations that consisted of clay, GCC, and Clay-GCC blend pigments, applied using commercial spray and MSP coating methods. The same base paper used for all samples was made from 100% thermal mechanical pulp (TMP) paper with a 47.3 gsm basis weight. The results of this study demonstrated that, for the same pigment content and base paper, spray coated papers had similar coating structural characteristics to MSP coated papers, and that altering the coating formulations can have a significant effect on the resulting coating structure of the spray coated papers. All spray coated papers had a higher surface roughness than MSP coated papers.