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The Effect Of Drying And Rewetting On Single Fiber Flexibility For Chemical And Mechanical Pulps, Mark E. Dulemba

Masters Theses

Over the years, various attempts have been made to develop methods to measure fiber flexibility. In the course of developing test methods for fiber flexibility, various studies have been performed that measure the flexibilities of different wood pulps.

In this study, never-dried individual thermomechanical pulp (TMP) and bleached kraft fibers were mounted on the tip of a glass tube submerged in water and deflected by water flow. The deflection of the individual fibers was measured using a microscope and image analysis software. The fibers were then dried, rewetted, and the deflection was measured_again. This drying and rewetting cycle was repeated …

The Repulping Of Wet-Strength Paperboard, Angelo N. Melchiorre

Masters Theses

Beverage carrier paperboard containing the polyamide wet-strength resin is one type of fiber that is presently landfilled. In this study, it was repulped at a 15% consistency and a pH of 10 at 150° F. in a z-bar mixer. Hydrogen peroxide (HP), ammonium perswulfate (AP), sodium persulfate (SP) and dimethyldioxirane (DMD) were used during repulping. The HP was added at 1.0%, 2.5% and 5.0%, based on O.D. weight of the fiber. The remaining chemicals were added at the same oxidation equivalent. During repulping, the pulp was screened using a Britt Jar to determine percent yield over time. Samples were taken …

Caloric Production Of Black Bear Foods In Great Smoky Mountains National Park, Robert Michael Inman

Masters Theses

Understanding energetic potential of habitat patches is important for management designed to provide adequate habitat for wildlife species. Great Smoky Mountains National Park (GSMNP) has a high density of black bears that have been studied intensively from 1968-1997; habitats within the Park are relatively undisturbed, and similar vegetative cover types can be found throughout the southern Appalachian mountains. Black bear reproduction in the Park has been correlated to hard mast production, however little work has been done to assess the importance of soft mast. Geographic Information System (GIS) based habitat use models have been developed for bears in the Park, …

Effect Of Wire Gauge, Web Speed, And Coating Solids On Leveling Of Streaks In Rod Coating, Mukhtar A. Khan

Masters Theses

The behavior of coatings and their study is becoming more important in proportion to additional use of coated paper. Good coating is key to enhance print quality. Blade coating is quite common, but rod coating is coming back for the advantages it has over blade coating. The process of rod coating is simpler and maintenance is easier. Coatings at low solids can be applied with ease and the impurities are washed away by rod rotation. The surface profile of coating is a potential concern, due to streaks in the machine direction. If the coating is immobilized before the streaks heal, …

Influence Of Metal Ions On Brightness Reversion Of Mechanical And Tmp Pulps, Ajay K. Jain

Masters Theses

High-yield mechanical pulps possess high opacity, bulk, compressibility, and excellent printing properties as well. But these pulps are still not suitable for producing high-grade papers because of discoloration. The brightness with age may be due to the presence of lignin, hemicellulose (and even cellulose), resins, metal ions, and additives such as rosin, alum, starch, and other polymers.

This study includes the effects of different metal ions on brightness stability of wood, thermomechanical pulps, chemithermomechanical pulps, and alkaline peroxide mechanical pulps. Also studied were the influences of metal ions on bleached pulps towards brightness loss. The metal ions selected for this …