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Improving chlorine dioxide bleaching efficiency by selecting the optimum pH targets 通过选择最佳pH目标提高二氧化氯漂白效率
July 2008 Pub Date : 2008-08-01 DOI: 10.32964/tj7.7.3
P. Hart, D. Connell
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引用次数: 8
Kraft pulping and papermaking properties of hot-water pre-extracted loblolly pine in an integrated forest products biorefinery 热水预提火炬松在综合林产品生物炼制中的硫酸盐制浆和造纸性能
July 2008 Pub Date : 2008-08-01 DOI: 10.32964/tj7.7.22
Sung-hoon Yoon, A. V. van Heiningen
{"title":"Kraft pulping and papermaking properties of hot-water pre-extracted loblolly pine in an integrated forest products biorefinery","authors":"Sung-hoon Yoon, A. V. van Heiningen","doi":"10.32964/tj7.7.22","DOIUrl":"https://doi.org/10.32964/tj7.7.22","url":null,"abstract":"Our objective in this research was to investigate the effect of hot-water pre-extraction of softwood on the behavior and papermaking properties of kraft pulp. Loblolly pine wood chips were treated with pressurized hot water at an elevated temperature of 170°C until the H-factor reached 200 and 500 hours. Kraft pulping of the extracted wood chips, performed at 15% effective alkali charge and 30% sulfidity, showed significantly improved delignification rates with 40% to 60% higher rate constants than corresponding kraft control cooks. The total pulp yield based on the original wood at a given kappa number was 3% and 6% lower than the control at the pre-extraction H-factors of 200 and 500 hours, respectively. The water pre-extracted kraft pulps showed a reduced refining response to PFI mill refining. The handsheets prepared from bleachable-grade pulps, after kraft pulping of hot-water pre-extracted wood chips for 400 H-factor hours, showed reduced tensile strength because of the lower percentage of hemicelluloses, compared to the control; but comparable pulp viscosity, zero-span wet tensile strength and tear resistance.","PeriodicalId":264119,"journal":{"name":"July 2008","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123196438","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}
引用次数: 58
Effects of debonding agents and refining on the properties of deinked pulp 脱墨剂和精炼对脱墨纸浆性能的影响
July 2008 Pub Date : 2008-08-01 DOI: 10.32964/tj7.7.9
M. Talaeipoor, Reza Imani
{"title":"Effects of debonding agents and refining on the properties of deinked pulp","authors":"M. Talaeipoor, Reza Imani","doi":"10.32964/tj7.7.9","DOIUrl":"https://doi.org/10.32964/tj7.7.9","url":null,"abstract":"This study evaluates the interaction between the use of debonding agents and optimum refining levels on secondary fiber. The results showed that, while debonding agents decrease the mechanical strength of handsheets by decreasing fiber bonding, optimizing refining levels could compensate for this loss in strength.","PeriodicalId":264119,"journal":{"name":"July 2008","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124865544","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}
引用次数: 5
Water release from fractionated stock suspensions. Part 1 – Effects of the amounts and types of fiber fines 从分馏悬浮液中释放水。第1部分-细纤维数量和类型的影响
July 2008 Pub Date : 2008-08-01 DOI: 10.32964/tj7.7.28
Cedric A. Cole, M. Hubbe, J. Heitmann
{"title":"Water release from fractionated stock suspensions. Part 1 – Effects of the amounts and types of fiber fines","authors":"Cedric A. Cole, M. Hubbe, J. Heitmann","doi":"10.32964/tj7.7.28","DOIUrl":"https://doi.org/10.32964/tj7.7.28","url":null,"abstract":"Cellulosic fines produced varying resistance to dewatering in tests with a gravity-based freeness device. Fines at low to moderate levels had little effect on gravity dewatering, but fines slowed drainage considerably as their concentration increased beyond a threshold. Fines created by refining (secondary fines) slowed drain-age to a much greater extent than did those originally present in bleached hardwood kraft pulp (primary fines). The results were consistent with a mechanism in which unattached fines can migrate within a wet web to choke points, where they tend to block the flow of water.","PeriodicalId":264119,"journal":{"name":"July 2008","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132127585","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}
引用次数: 19
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