Effect of Different Forming Regimes on Retention Aid Programs (PPJ Studies)

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dc.contributor.advisor Dr. Martin A. Hubbe, Committee Chair en_US
dc.contributor.advisor Dr. John A. Heitmann, Committee Member en_US
dc.contributor.advisor Dr. Richard A. Venditti, Committee Member en_US
dc.contributor.author Tripattharanan, Taweewat en_US
dc.date.accessioned 2010-04-02T17:53:18Z
dc.date.available 2010-04-02T17:53:18Z
dc.date.issued 2003-07-10 en_US
dc.identifier.other etd-07092003-162828 en_US
dc.identifier.uri http://www.lib.ncsu.edu/resolver/1840.16/119
dc.description.abstract A new design of equipment called the Positive Pulse Jar (PPJ) was introduced in this study in order to compare the responses of different retention aid systems to hydrodynamic shear forces resulting from different idealized forming regimes. The major advantage of this equipment for this kind of study is the ability to simulate different forming regimes such as simple filtration, pulsation at different frequencies and amplitudes, uniform-shear forming, and a procedure corresponding to the Britt Jar method. Results showed that pulsations could increase the uniformity of paper, not only in the x-y direction, but also in some cases in the z direction as well. Under the conditions that were used for testing, a dual-polymer bridging system showed the greatest improvement in fine particle retention but this effect could be reduced by the application of hydrodynamic shear before dewatering. Following the application of high level of hydrodynamic shear, charge neutralization didn't show fully reversibility, and it was the least effective retention aid system compared with the other systems. Effects of new-designed cone rotor were also studied; making it possible to explore effects due to a well characterized average shear stress throughout the sample volume. For future studies, suggestions have been made to increase the usefulness of the PPJ as a tool in predicting the performance of new retention aid system under different forming conditions. en_US
dc.rights I hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to NC State University or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report. en_US
dc.subject Polyelectrolyte en_US
dc.subject Flocculation en_US
dc.subject Fiber fines en_US
dc.subject Hydrodynamic shear en_US
dc.subject Filtration en_US
dc.subject Papermaking en_US
dc.title Effect of Different Forming Regimes on Retention Aid Programs (PPJ Studies) en_US
dc.degree.name MS en_US
dc.degree.level thesis en_US
dc.degree.discipline Wood and Paper Science en_US

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