Life Sciences Commons^™

The Replupability Of Secondary Fibers Containing Latex-Based Pressure – Sensitive Adhesives, William K. Forester

Paper Engineering Senior Theses

It is the purpose of this thesis to investigate possible means of rendering latex-based pressure sensitive adhesives innocuous in currently operating secondary fiber systems.

It has been found that certain solvents will effectively attack and disperse latex-based pressure sensitive adhesives when used in solutions of 0.5 to 1.0 percent depending on the end product.

This involves presoaking the contaminated stock prior to defibering for varying amounts of time depending on the amount of contamination, the type of adhesive present, the temperature and pH parameters currently in use in each specific system.

It is also evident that contaminant build-up on equipment …

The Aging Of Recycled Fibers, Martha M. Dubbeld

Paper Engineering Senior Theses

The object of this thesis is to study the aging of recycled paper, focusing on strength and optical properties. To observe the changes in these properties, the following experimental procedure was used. 100% softwood fibers were pulped, made into handsheets, tested, artificially aged, again tested, repulped and bleached before being made into handsheets once again. Because of cross-linking due to heating, the aging strength losses were masked.

The Effect Of Silane Modified Kaolin On Rheological Properties, James Kuhagen

Paper Engineering Senior Theses

It is well known that increased latex usage in pigmented coatings will enhance strength properties. However, the increase will result in lower optical properties. A modified pigment could be advantageous in the binding of adhesive, where as at present a film formation and secondary forces are major influences in the colloidal system.

Preliminary results indicate silane coupling agents were compatible in the rheological systems studied. In addition, care should be exercised in the selection of an adhesive for a specified situation.

These positive results form a sound basis for further investigation of organofunctional silanes as coupling agents in a coating …

Variables Influencing The Filtration Of Water Through Paper, Daniel J. Geddes

Paper Engineering Senior Theses

When water is filtered through paper under constant pressure, the flow rate decreases with time, even if distilled water is used as the permeating fluid. On the basis of previous literature,·possible causes of this effect were thought to be fiber swelling, the presence of microscopic bubbles in the water, electrical forces, or structures formed by water molecules and ionic impurities.

Experimentation showed that there is a blocking agent present in the distilled water which causes the decrease in flow rate. These particulate agents are denser than water, and have a greater affinity for cellulose than for glass. The particulates have …

A Study Of Starches At The Size Press, Robert M. Mcdonald

Paper Engineering Senior Theses

A literature research is presented concerning the five different starches which were used. Also covered were size presses and how they affect paper properties. BOD was also covered, and how starch has a tremendous effect on it. The literature research indicates there are few quantitative results in this area.

The objective of the experimental work was to compare five different starches, applied at the size press, for physical and optical properties, and also BOD. The starches used were an ethylated, an oxidized, a cationic, a thermal-chemical and a thermal-chemical cationic. These five starches were applied at three solids levels and …

Student Information Management, Randy Rohrbach

Paper Engineering Senior Theses

This project is the design and implementation of a special database for the Paper Science Department. The data-base allows for sorting and searching of student information based on 1). name, 2.) age, 3.) number of credits, 4.) sex, and 5.) home state. The program was implemented in Pascal and therefore can be modified at a later date if additional features are described.

A Study Of Fiber-To-Fiber Flocculation In Pulp Suspensions, Pamela Peay

Paper Engineering Senior Theses

Fiber to fiber flocculation in pulp suspensions was studied and the influencing factors were discussed. The existence of a microfloc was proposed explain the behavior of flocculation versus time and degree of agitation. An experimental procedure to quantitatively describe the flocculation and its relationship to time and degree of agitation was not found. Polaroid photography, SLR photography, and a photocell and light source were the attempted methods.

The Use Of Hydrophobic Plastics As Ink Collectors During Deinking Of News Waste, Brian L. Pahl

Paper Engineering Senior Theses

The following study reports the performance of polyethylene and polystyrene in two different forms as ink collectors during deinking. Following a brief case history of conventional deinking and a detailed discussion of deinking with plastic as an ink collector, many variables affecting this process are analyzed. Although the results were somewhat eratic, some generalizations can be made. The polystyrene in the porous form provided maximum ink removal. This can be attributed to its ability to retain adsorbed ink particles. Regardless of the system used, ink removal increased with additional collector surface area. Nevertheless, some re-dispersion of ink particles was evident …

The Effect Of Stock Temperature On Centrifugal Cleaner Efficiency, Randall J. Stoykovich

Paper Engineering Senior Theses

As of age, the requirements of paper and pulp quality have multiplied. Optimizing the efficiency of the stock preparation system is a primary concern. The centrifugal cleaner represents an almost universal aspect of pulp cleaning. In an attempt to maximize contaminant content of the rejects with as little fibrous material as possible, the temperature was varied in a closed loop system which incorporated a Bolton-Emerson Albia 300SC centrifugal cleaner so as to determine an optimum range for operation .

The Chemical Buildup In A Closed Water System Using Recycled Fiber Furnish, Stephen R. Tremont

Paper Engineering Senior Theses

In recirculating whitewater in a closed water system, the solids will increase leading to operational problems such as corrosion, scale, reduced drainage rates, reduced wire life, increased temperatures, felt plugging, foam, and dirt. In dealing with these problems, whitewater samples from a conventional seven vat cylinder board machine were tested for chemical composition. The machine operates on a closed water loop and produces approximately 250 tons per day recycled boxboard. Tested anions included chloride, silica, phosphates, nitrates, sulfate, sulfide and tannin-lignin. Cations analyzed included calcium, barium, iron, aluminum and copper. Tests were conducted over an eighteen day machine running period …

The Removal Of Hot Melt Adhesives From Recycled Paper Stock By The Froth Flotation Method, Dennis G. Nivison

Paper Engineering Senior Theses

The object of this report is to explore the area of flotation as a means of removing hot adhesive from recycled paper stock. The major area of research resolved around choosing a surfactant capable of good performance in enhancing the flotation of adhesive and minimizing fiber loss. This surfactant was chosen by using a combination of zeta - potential studies and a flotation study in which 3 surfactants were screened. The highest performance was given by Rohm and Haas Triton N-100 followed respectively by X-114 and X-165. Even though all the surfactants had approximately the same high level of adhesive …

Fish And Wildlife Mitigation Report : Dickey-Lincoln School Lakes Project, Maine, New England Division, Corps Of Engineers, U. S. Army Engineer Division

Dickey-Lincoln School Lakes Project

The Dickey Lincoln School Lakes Project is a proposed multipurpose project located on the upper reaches of the St. John River in Aroostook County, Maine. Development would consist of two dams with associated reservoirs and hydroelectric generating facilities, five dikes and transmission lines. A more detailed description of the proposed project and its associated impacts is contained within the Revised Draft Environmental Impact Statement for the proposed project.

Behavior Of The Southern Pine Beetle On The Bark Of Host Trees During Mass Attack, Jack E. Coster, W.D. Bunt, P.C. Johnson

Faculty Publications

Twenty-two percent of the southern pine beetles, Dendroctonus frontalis Zimmermann (Coleoptera: Scolytidae), that landed on the bark during the 1st 4 days of mass attack in East Texas, eventually entered the tree. Other beetles either flew away (43%), dropped off the host (32%), or were eaten (2%). No significant difference in searching time or distance traveled was found for day of attack or beetle sex. Males spent significantly less total time on the bark than females.

Spatial Distribution Of Flying Southern Pine Beetle (Coleoptera:Scolytidae) And The Predator Thanasunus Dubius (Coleoptera:Cleridae), Jack E. Coster, Paul C. Johnson, Reed J. Reeve

Faculty Publications

Spatial dispersion patterns of flying southern pine beetles, Dendroctonus frontalis Zimm., and the clerid predator Thanasimus dubius (F.) were determined within 3 natural infestations of southern pine beetle (SPB) in eastern Texas using grids of sticky traps. There was significant positive association of the 2 insects throughout the trapping grids, although aerial population densities of the clerid were inversely related to aerial densities of SPB. Aggregation patterns were quantified using the index of patchiness (lP) and the regressions of mean crowding (m) on mean density (m). Both methods showed a highly clumped pattern for both beetle species. SPB density in …

Characterization Of Grand Fir Colonized By Nosodenron Californicum Horn (Coleoptera: Nosodendridae), David Kulhavy

Faculty Publications

In two 50-hectare forested areas in a Thuja plicata/Pachistima myrsinites habitat type, 52 grand firs, Abies grandis (Douglas) Lindley, hosts of Nosodendron californicum Horn, were located. Trees colonized by N. 'califomicum averaged 40.6 min height, 115 years in age and 59.5 em in diameter. Average elevation was 906.8 m.

Southern Pine Beetle Handbook: Woodpeckers And The Southern Pine Beetle, James Kroll, Richard N. Conner, Robert R. Fleet

eBooks

In 1974 the U.S. Department of Agriculture initiated the Combined Forest Pest Research and Development Program, an interagency effort that concentrated on the Douglas-fur tussock moth in the West, on the southern pine beetle in the South, and on the gypsy moth in the Northeast. The work reported in this publication was funded in part by the Program. This handbook is one in a series on the southern pine beetle.

Outlook For Timber From Mississippi’S Private Nonindustrial Forests, Steven H. Bullard, G. H. Weaver

Faculty Publications

Forestry is the dominant land use in Mississippi. Fifty-five percent of the State's total land base is commercial forest and 73 percent of this is held by private nonindustrial owners. The estimated timber harvest value for 1979 was over $550 million. Forest products were second only to soybeans in value in Mississippi's agricultural and forestry crops. The 1979 value is the fourth consecutive record harvest and represents increases in both harvest volume and product prices.

Nepal Studies Association Bulletin, No. 21, Nepal Studies Association, Donald A. Messerschmidt

Nepal Studies Association Newsletter

No abstract provided.

A Post-Impoundment Investigation Of The Beech Fork Drainage Basin, Twelvepole Creek, Wayne And Cabell Counties, West Virginia, Donald Borda

Theses, Dissertations and Capstones

Fish populations were collected at six stations by means of electrofishing to determine the composition after impoundment. A total of 748 fishes weighing about 9 pounds (4 kg) were collected. Seven families representing 31 species were collected and categorized as game, forage and rough fishes. Game fishes made up 9.1 percent of the total number and 22.3 percent of the total weight; forage fishes 83.0 percent by number and 29.7 percent by weight. The average standing crop was 15 pounds per acre.

Benthic invertebrates were collected at six stations by means of a bottom dredge. A total of 1535 specimens …

Wrcc-42 "Evaluation Of Methods To Control Rodent Damage To Hay, Range And Grain Crops"

Western Region Coordinating Committee for Vertebrate Pests of Agriculture, Forestry, and Public Lands (WCC-95)

December 11

9:00 a.m. Welcome and Introduction; Ralph A. Young, Associate Director, Nevada Agr. Exp. Sta.; Paul T. Tuel1er, Administrative Advisor to WRCC-42; Committee members and visitors

9:30 Discussion of procedures for a WRCC and WRCC-42 in particular

10:00 Break

10:20 Discussion of Coordinating Committee objectives

12:00 lunch

1:30 - Presentation of research activities being conducted by

5:00 the various committee members

December 12

8:30 a.m. Continued presentation and discussion of research

10:00 Break

10:20 - General discussion of committee concerns.

12:00 Election of committee officers.

Selection of next meeting time and place.

Ecology And Management Of Ruffed Grouse, Judith L. Landry

Aspen Bibliography

No abstract provided.

Above-Ground Component Weights In Alberta Populus Stands, W.D. Johnstone, E.B. Peterson

Aspen Bibliography

No abstract provided.

Lucille Vinyard Journal 1980, Lucille Vinyard

Lucille Vinyard Journal Collection

No abstract provided.

Effects Of Fertilization On Hypoxylon Canker Of Trembling Aspen, G.E. Teachman, D.J. Frederick, W.E. Perkis, M.F. Jurgensen

Aspen Bibliography

No abstract provided.

Biomass Productivity Of Young Aspen Stands In Western Canada, I.E. Bella, J.P. Defranceschi

Aspen Bibliography

No abstract provided.

Rooting Stem Cuttings From Aspen Seedlings, George A. Schier

Aspen Bibliography

No abstract provided.

Observations On The Ecology And Evolution Of Quaking Aspen, Populus Tremuloides, In The Colorado Front Range, Jeffry B. Mitton, Michael C. Grant

Aspen Bibliography

No abstract provided.

Propagation Of Quaking Aspen (Populus Tremuloides Michx.) From Root Cuttings, Karen Elizabeth Burr

Aspen Bibliography

Lateral root cuttings were collected at five quaking aspen (Populus tremuloides Michx.) clones in Larimer County, Colorado on October 2, 1977 and May 30, 1978. The October 1977 root cuttings were stored eight months in air-tight plastic bags at 0 to 4°C. On June 1, 1978 the stored (October 1977) and the fresh (May 1978) root cuttings were planted in a greenhouse propagation bench. All sprouts that developed were allowed to grow on half of the 10-cm long root cuttings randomly selected as controls. On the remaining half of the root cuttings, designated pruned, all but the tallest sprout were …

Energy Values Of Nine Populus Clones, Terry F. Strong

Aspen Bibliography

Compares calorific values for components of nine Populus clones. The components include stem wood, stem bark, and branches. Also compares calorific values for clones of balsam poplar and black cottonwood parentages.

Northeastern Forest Experiment Station: Oak Site Index And Biomass Yield In Upland Oak And Cove Hardwood Timber Types In West Virginia, Harry V. Wiant, Michael S. Fountain

Aspen Bibliography

No abstract provided.