May 2008Pub Date : 2008-06-01DOI: 10.32964/tj7.5.3
H. Patel, F. Ein‐Mozaffari, S. Upreti
{"title":"Continuous Time Domain Characterization of Mixing in Agitated Pulp Chests","authors":"H. Patel, F. Ein‐Mozaffari, S. Upreti","doi":"10.32964/tj7.5.3","DOIUrl":"https://doi.org/10.32964/tj7.5.3","url":null,"abstract":"Although mixing is widely used in the chemical process industry, it is difficult to characterize. Mixing is even more difficult to characterize in pulp and paper manufacturing, which involves non-Newtonian pulp suspensions and non-ideal flows. In the past, researchers have characterized mixing in the discrete-time domain with model simplifications. In our study, we used the continuous time domain to determine the mixing parameters for laboratory-scale agitated pulp chests. We used a robust hybrid algorithm incorporating genetic operations and gradient search in conjunction with the differential-algebraic mixing model.","PeriodicalId":122580,"journal":{"name":"May 2008","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131871063","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
May 2008Pub Date : 2008-06-01DOI: 10.32964/tj7.5.25
António J. A. Santos, M. Amaral, Á. Vaz, O. Anjos, R. Simões
{"title":"Effect of Eucalyptus globulus wood density on papermaking potential","authors":"António J. A. Santos, M. Amaral, Á. Vaz, O. Anjos, R. Simões","doi":"10.32964/tj7.5.25","DOIUrl":"https://doi.org/10.32964/tj7.5.25","url":null,"abstract":"It is well documented that the characteristics of raw materials determine the papermaking potential of the pulp. The variability of the wood used by the pulp mills is extremely wide. We report on the behavior of three Eucalyptus globulus wood chip samples with basic densities of 0.467, 0.537, and 0.600 g/cm3, in kraft cooking and papermaking. The pulp yield range of 49%–58.7% was attributed to the different wood chemical composition, in particular to the lignin content and relative proportion of cellulose and hemicelluloses. The morphological characteristics of the pulp fibers were also markedly different. The average fiber length is 0.71, 0.80, and 0.85 mm, respectively for the E. globulus of low, intermediate, and high wood basic density. The pulp fibers from the lowest density wood exhibit very high wet fiber flexibility, while those from the highest density wood exhibit rigid behavior. Using this structural property as reference, the corresponding papers are stronger, but exhibit lower light scattering coefficients than those from the lowest density wood","PeriodicalId":122580,"journal":{"name":"May 2008","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125533340","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
May 2008Pub Date : 2008-06-01DOI: 10.32964/tj7.5.10
Y. Zou, J. Hsieh, J. Kokoszka
{"title":"PET recyclable polymer for making paper washbowls","authors":"Y. Zou, J. Hsieh, J. Kokoszka","doi":"10.32964/tj7.5.10","DOIUrl":"https://doi.org/10.32964/tj7.5.10","url":null,"abstract":"A paper washbowl made from recycled newspaper that can hold hot soapy water (70o C) for a mini-mum of 4 h was successfully developed by using EvCote® PGLR-25 added into the fiber slurry before the bowl was formed. We also studied other variables such as furnish, size (rosin and alkyl ketene dimer), and retention aids. In addition to the EvCote® PGLR-25, the results showed that the retention aid and rosin both are important ingredients in the fiber formulation.","PeriodicalId":122580,"journal":{"name":"May 2008","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129365492","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
May 2008Pub Date : 2008-06-01DOI: 10.32964/tj7.5.13
Ying-Xue Han, K. Law, C. Daneault, R. Lanouette
{"title":"Chemical and Mechanical Techniques for Improving the Papermaking Properties of Jack Pine TMP Fibers","authors":"Ying-Xue Han, K. Law, C. Daneault, R. Lanouette","doi":"10.32964/tj7.5.13","DOIUrl":"https://doi.org/10.32964/tj7.5.13","url":null,"abstract":"Jack pine is undesirable for mechanical pulping compared with spruce and balsam fir. In this work, the authors use chemical and chemimechanical techniques to improve the papermaking properties of jack pine TMP long fibers. Chemical techniques included TEMPO-mediated oxidation (TOX) and alkaline peroxide (AP) treatment. Some pulps were beaten in a domestic blender. Results indicated that TOX alone or in combination with AP yielded excellent results. When used alone, AP treatment resulted in little improvement in handsheet properties. However, it gave excellent results when followed by beating.","PeriodicalId":122580,"journal":{"name":"May 2008","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121551775","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
May 2008Pub Date : 2008-06-01DOI: 10.32964/tj7.5.19
Y. Nanri, H. Konno, H. Goto, Kazuto Takahashi
{"title":"A New Process to Produce High-Quality PCC by the Causticizing Process in a Kraft Pulp Mill","authors":"Y. Nanri, H. Konno, H. Goto, Kazuto Takahashi","doi":"10.32964/tj7.5.19","DOIUrl":"https://doi.org/10.32964/tj7.5.19","url":null,"abstract":"A new process has been developed to produce high-quality precipitated calcium carbonate as a paper filler by using the causticizing process in a kraft pulp mill. The causticizing process converts green liquor into white liquor in the kraft pulp mill, producing calcium carbonate as a by-product. If the calcium carbonate (CCC) produced by causticizing could be extracted from the process and used as a papermaking material and if makeup quick-lime for white-liquor generation were supplied, rotary lime-kiln operation could be reduced or eliminated, and the consumption of fuel oil and the resulting discharge of carbon dioxide gas could be reduced. \u0000However, conventional CCC includes nonuniform particles with large diameters, which cause severe abrasion of plastic wire on paper machines and poor opacity of paper when it is used as a paper filler. To overcome these disadvantages, the challenge was to find a way to control the morphology of CCC produced from causticizing in the same manner as that of commercial precipitated calcium carbonate (PCC). In conventional causticizing, green liquor is mixed with quicklime to produce CCC and white liquor in two steps: slaking of quicklime with water, and causticizing of the slaked lime with sodium carbonate. When these two reactions were separated and precisely controlled, it was found that CCC was obtained in various forms such as rice-, spindle-, and needle-like particles, some of which demonstrated high opacifying ability and little plastic-wire abrasion when used as paper fillers. In particular, the needle-like aragonite CCC crystal produced in this way demonstrated higher opacity in papermaking than commercial aragonite PCC. \u0000Based on these laboratory findings, the reactor was scaled up successfully to a mill-scale plant producing needle-like CCC at the Iwakuni mill of Nippon Paper Industries. This plant has been producing good-quality CCC for paper filler and good-quality white liquor for the last five years.","PeriodicalId":122580,"journal":{"name":"May 2008","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121520037","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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