Date of Award
Bachelor of Science
Pulp and Paper Technology
James E. Kline
This paper investigates the possibility that there is a relationship between the tearing properties and elongation properties of a sheet of paper. A lack of specific information in the literature and the advent of the in-plane tear method contributed to the need for work to be done in this area. Pulp was prepared according to TAPPI Standards and handsheets formed on a Noble And Wood sheet mold. After wet pressing, sheets were stretched with a hand made device to varying degrees, and dried in an oven in the stretched position. An Instron machine was used to determine the percent elongation, tensile energy absorption, and in-plane tear. An Elmendorf tear tester was used, also to determine tear. The results showed the in-plane tear to be very sensitive to elongation while the Elmendorf tear was not as sensitive. However, in both cases the tear did increase with an increase in sheet elongation. The reason for this occurring was due to more energy being dissipated throughout the sheet as the elongation increased.
Axel, Thomas C., "Influence of Sheet Extensibility on Tearing Strength" (1969). Paper Engineering Senior Theses. 71.