Rudolf Haraga

Date of Award


Degree Name

Master of Science


Chemical and Paper Engineering


Paper Engineering, Chemical Engineering and Imaging

First Advisor

Dr. Thomas Joyce

Second Advisor

Dr. Margaret Joyce

Third Advisor

Dr. Alexandra Pekarovicova

Access Setting

Masters Thesis-Open Access


Silicone coating is widely used on papers that require low surface tension. Such papers are called release papers and are used in label, food, and packaging applications. Before silicone coating is applied, the base paper undergoes sizing procedures to smooth the surface and to cover voids present in the surface of the paper substrate. After the base paper is properly sized, it is silicone coated. This makes the surface of the base paper have a low surface energy. Therefore, when a second adhesive paper is applied to the base paper, the second adhesive paper can be easily recovered from the base paper.

There are several test methods used to assess silicone holdout. Most of them are based on the force needed to remove the adhesive paper from the release base paper. The stain test and ultrasound absorption by paper are proposed in this research. The stain test measures the area not covered by silicone and thus suggests the probable quality of the sized base paper. Ultrasound transmittance measures the change in ultrasound absorption by the base paper while the paper is being wetted, thus wetting curve is observed.

It is concluded that image analysis can provide information about silicone holdout, while ultrasound transmittance provides information about starch sizing efficiency.