Author

Shields

Date of Award

12-2017

Degree Name

Master of Science

Department

Paper Engineering, Chemical Engineering and Imaging (to 2013)

First Advisor

Dr. Alexandra Pekarovicova

Second Advisor

Dr. Paul D. Fleming

Third Advisor

Dr. Jan Pekarovic

Access Setting

Masters Thesis-Campus Only

Restricted to Campus until

12-2019

Abstract

The interaction of water with paper plays a role in web handling characteristics during commercial heat set web offset printing. Water absorption leads to lower web tension for a given strain.

This research investigates paper properties and their role in preventing lateral web movement from cross machine air flows in the drying section during normal printing operations. Tensile properties of sheets are measured at various moisture contents and then used to determine the equilibrium stress-strain relationship for papers at moisture contents typical of heat set web offset printing. Permeability, fiber orientation and tensile stiffness are evaluated against lateral web movement on press. To ascertain whether the absolute amount of water absorbed or the rate of water absorption is more important, absorption rates are measured ultrasonically and compared to performance on the printing press. And, an experimental test is investigated where elongation is measured against changes in relative humidity.

Understanding the effect of water absorption and absorption rate on the stress-strain relationship of paper may yield further understanding of web break tendency during heat set web offset printing.

Share

COinS