Life Sciences Commons^™

Prediction Of Release Properties Of Silicone Coated Paper Through Analysis Of Coating Particle Size And Distribution, Kent Bartholomew

Paper Engineering Senior Theses

Silicone release coatings are gaining in popularity. The use of water-borne emulsions is seeing its way into the production of release coatings as well as pressure sensitive applications.

Thermoset silicone release coatings systems consist of a reactive polymer, a crosslinker, and a catalyst. A condensation reaction takes place to form the low surface energy silicone film which is primarily what gives good release property.

It is believed that an emulsion's stability, and hence quality, can be related to the particle size and distribution.

It was the goal of this study to quantify the relationship between particle size/distribution and release properties …

An Analysis Of The Wash And Flotation Deinking Processes, Brian L. Felgner

Paper Engineering Senior Theses

The purpose of this paper is to obtain data, so that we may compare the ability of Floatation vs. Wash deinking to produce a paper of equal standards as the original unprinted base-stock.

It was determined that both flotation and wash deinked stock with the addition of 40% fresh pulp can produce a paper of equal physical and optical properties as the unprinted stock from which it was made.

Floatation deinked stock was found have a higher materials cost, however, it displayed better strength and opacity properties than wash deinked stock. The difference is thought to result from a large …

Site-Directed Mutagenesis Of The Putative Processing Site Of Recombinant Human Immunodeficiency Virus Reverse Transcriptase, Susan M. Poppe

Masters Theses

The human immunodeficiency virus (HIV) is the etiological agent of the acquired immune deficiency syndrome (AIDS). This retrovirus, encodes a RNA dependent DNA polymerase, reverse transcriptase (RT), which is essential to virus replication. Biochemical analysis indicated that RT is composed of 2 polypeptides of 66,000 and 51,000 daltons (p66 and p51) which combine to form a heterodimer. This heterodimer is thought to arise from the post-translational processing where p66 is made and either autocatalytic or proteolytic cleavage events result in a heterogeneous p66/p51. Site-directed mutagenesis was used at the proposed processing site to probe HIV-RT processing.

Three prokaryotic expression vectors …

Cloning And Sequencing Of The Eco Rii Monomer Fragment Of Satellite Dna From The Mouse Mus Musculus, Timothy Patrick Boyle

Masters Theses

Total mouse satellite DNA was isolated in cesium chloride gradients in the presence of the dye Hoechst 33258. This satellite fraction was digested with Bst Nl, an isoschizomer of the restriction enzyme Eco RII, and the 234 base pair monomer fragment was cloned into the plasmid vector pBS. Dideoxynucleotide sequencing of the cloned DNA yielded significant homology with the published consensus sequence of mouse satellite DNA (92%).

Design Specifications And Requirements Of Paper For Flexographic Printing, Martha L. Stankey

Paper Engineering Senior Theses

Flexographic printing is a direct printing from the plate to the paper. This process has been growing during the last few years, especially in the newspaper area. One of the problems in the industry today, however, is the lack of good paper specifications for the flexographic printing process. The objective of this project was to gather samples of good flexographic newsprint, and to test them for paper properties in order to determine a set of paper specifications for flexographic newsprint. Also, lithographic (the predominant printing process in the newspaper industry) newsprint samples were gathered in order to compare between the …

A Comparison Of Maximal And Submaximal Heart Rate And Oxygen Uptake In Combined Arm And Leg Bicycling And Rowing, Victoria L. Asaro

Masters Theses

No abstract provided.

Utilizing The Horizontal And Vertical Size Presses For Optimum Two-Sided Color Correction Under Acid And Neutral Conditions, Charles E. Dickens Jr.

Paper Engineering Senior Theses

This Engineering Problem investigates the utilization of the horizontal and vertical size presses for optimum two-sided color correction.

This was accomplished by making paper at the Western Michigan University Pilot Plant Fourdrinier papermachine. Paper was made under an acid system and a neutral system. A red anionic direct dye was added at the wet-end to internally dye the sheet. Color two-sidedness was induced by manipulating and wet-end vacuum elements, as well as the Fourdrinier shake. In addition, the red anionic direct dye that was used is known for it's "topsided" characteristics.

The paper was then surface colored using the size …

The Effect Of Aluminum Species And Cationic Starch On Retention, Kathleen R. Rutledge

Paper Engineering Senior Theses

Aluminum sulfate, commonly know as alum, undergoes hydrolysis when placed in water and a variety of aluminum species are produced. The ionic charge of the species is dependent on pH. Research has shown that maximum adsorption occurs in the presence of Al₈ (OH)₂₀⁺⁴. Alum competes with other positively charged particles such as cationic starch for adsorption sites on fibers. Starch charge density and molecular weight govern the extent to which cationic starch adsorbs and bridges to fibers. This project is a study of the influence of cationic starch molecular weight and charge density, and aluminum species …

Electrokinetic Treatment Of Sludge, Matthew G. Kwiatkowski

Paper Engineering Senior Theses

Disposal of sludge has become a major issue in the pulp and paper industry because of the decreased space in landfills and the possibility of pollution from the sludge. By increasing the amount of solids in the sludge (dewatering), the sludge could be disposed of using less land or by incineration, composting, or other method. The dewatered sludge is easier to handle also because of its decreased volume. The method of dewatering which was used for the experiment was by electrokinetics. Electrokinetics is the technology of separating solids and liquids from suspensions of finely divided solids or colloidal particles using …

The Role Of Fiber Mechanical Treatment On The Retention Of Cationic Starch, David A. Glass

Paper Engineering Senior Theses

Cationic starches possess a positive or cationic charge. Because of this charge, they have found widespread use at the wet end of the papermachines. When applied properly, cationic starches have been found to increase filler and fines retention, improve interfiber bonding, increase pick resistance and reduce BOD in mill effluent. In order to obtain these benefits, it is first important to retain the cationic starch in the sheet.

Several factors have been determined to affect cationic starch retention. These factors include - pH, starch molecular weight, starch charge density, rate of application, retention aid used, furnish type and degree of …

The Effect Of Carboxylation Of Styrene-Butadiene Latex On Binder Migration, Peter James Rudy

Paper Engineering Senior Theses

A literature review was conducted concerning material related to carboxylation of styrene-butadiene latexes, binder migration, and binder migration measurement. Theory showed the process by which styrene and butadiene monomers contribute to make up the polymer chain and the effect of S/B ratio, particle size, crosslinking and carboxylation by vinyl acid addition type, level and location on the chain. Binder migration parameters related to coated surface and base sheet migration were addressed, as was viscosity control to reduce migration. Measurement types including attenuated total reflectance (ATR) using the fourier transform infrared (FTIR) was reviewed.

Based on the literature an experimental procedure …

Optimization Of The Bleached Optical Properties For Southern Pine Sulphonated Thermomechanical Pulp, Steven Thomas Six

Paper Engineering Senior Theses

The object of this thesis was to determine if the addition of Anthraquinone to sulphonated CTMP process would increase the optical properties without decreasing the strength properties. Along with the AQ addition, the percent refining done on the fibers was increased to see what effects it would produce on the optical properties.

The pulp used was southern pine and was obtained from American Fibrit Company, Battle Creek, Michigan.

The distinction that sulphonated thermomechanical pulps produce a outstanding material for inexpensive paper such as newsprint has been known for a long time. With the introduction of high brightness newspaper, like USA …

Application Of Image Analysis To Recycled Fiber Characteristics, Evert W. Vanderberg

Paper Engineering Senior Theses

The purpose of this thesis was to determine if crimp could be measured in virgin and recycled Kraft softwood. Comparisons of the physical property data and the crimp values were also to be done.

The results for this thesis showed that crimp is not an important property of the softwood used. Because of this the comparisons of data could not be done. More research must be done to determine if the sampling methods that used are valid and if crimp can be found in other fiber types.

The Effects Of Over Drying, Before The Size Press On Strength Properties, William A. Granger

Paper Engineering Senior Theses

This thesis was designed to determine the effects of moisture variations before the size press, and its effects on strength properties. This experiment involved laboratory experimentation along with a paper program pilot plant two day trial.

The results from the laboratory data revealed that an increased moisture content into the size press resulted in an increase in overall strength content for tests including tear, burst, and fold. The pilot plant trial data showed a specific window effect, in that at very low/high moisture levels entering the size press, a significant decrease in strength could be seen.

It was also found …