Behavior of Adhesive Materials in Screening Devices for Paper Recycling

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dc.contributor.advisor Hasan Jameel, Committee Co-Chair en_US
dc.contributor.advisor Martin A. Hubbe, Committee Member en_US
dc.contributor.advisor Saad A. Khan, Committee Member en_US
dc.contributor.advisor Richard A. Venditti, Committee Co-Chair en_US Lucas, Bradley Earle en_US 2010-04-02T18:28:08Z 2010-04-02T18:28:08Z 2004-04-28 en_US
dc.identifier.other etd-01132004-115930 en_US
dc.description.abstract The objective of this research is to understand the behavior of pressure sensitive adhesive (PSA) materials in industrial and laboratory screening devices. The research was initiated by screening pulp containing PSA using an industrial pressure screen with fine slots. The industrial pressure screen removed less than 80% of the feed PSA contaminant. In contrast, an atmospheric laboratory screen of the same slot width, 0.006 inches, removed 99% of the PSA. One of the reasons for the lower removal efficiency was found to be a significant breakage of PSA particles into smaller particles within the industrial pressure screen. The breakage of PSA particles in a shear field was studied using a high shear mixer and the consistency was found to be the most significant variable affecting the breakage of the PSA. It was also of interest to investigate how the PSA material could deform and pass through the fine slot of a pressurized industrial screen. A laboratory screening device with a single slot was developed to study the passage of PSA particles through the slot as a function of pressure drop across the slot. It was observed that at moderate pressure drops, particles with their smallest dimension up to five times the slot width passed through the slot. Increased temperature promoted the passage of the particles through the slot, indicating that the physical properties of the PSA influenced its passage. To understand the relationship between PSA formulation, physical properties, and passage of particles through a fine slot, several PSA formulations of known composition were prepared for analysis. Differences in the PSA formulations were found to affect the yield strain, yield stress, and modulus of the PSA films, which correlated with particle breakage in the pulper. Yield stress and particle area correlated with particle passage through the slot. A mechanical model for passage is in agreement with the experimental results, indicating that yield stress and particle size are significant for PSA particle passage through fine slots. These studies have resulted in important information for screen manufacturers, paper recyclers, and PSA producers to improve the removal of PSA particles from recovered paper. 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 screening en_US
dc.subject adhesive properties en_US
dc.subject particle extrusion en_US
dc.subject particle breakage en_US
dc.subject paper recycling en_US
dc.subject particle passage en_US
dc.subject pressure sensitive adhesive en_US
dc.title Behavior of Adhesive Materials in Screening Devices for Paper Recycling en_US PhD en_US dissertation en_US Wood and Paper Science en_US

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