PHYSICAL-MECHANICAL PROPERTIES EVALUATION OF PULPS PRODUCED WITH NOVEL BLEACHING SEQUENCES
Autor(a) principal: | |
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Data de Publicação: | 2010 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | por |
Título da fonte: | Ciência Florestal (Online) |
Texto Completo: | https://periodicos.ufsm.br/cienciaflorestal/article/view/1766 |
Resumo: | The efficiency of oxygen delignification is very low for pulps of low number kappa and with high concentrations of hexenuronic acids, therefore the oxygen does not react with these acids, so being minimum the elimination of these during the oxygen delignification (pre-O2) in simple or double stage. In this study, the physical-mechanical properties of pulp of kappa number 17 and 14, produced with modified cooks and with the application of AD(EO)D techniques for pulp of kappa 17 and DHT(EPO)DP for pulp of kappa 14 for the bleaching up to 90% ISO, had been investigated. The main objective of this study was to evaluate the physical-mechanical properties in pulps submitted to the bleaching sequences without oxygen in the beginning of the sequence. As references, cooks had been carried until numbers kappa 17 and 14, oxygen delignification and conventional bleaching for sequences A/D(EO)D for pulp of kappa 17 and DHT(EPO)DP for pulp of kappa 14. The alternative bleaching, without pre-O2, resulted in bleached pulps with bigger integrity that of the reference, what it was confirmed by the values significantly higher of bulk, tear index, opacity and air resistance of the pulp weakly refined (for tissue papers). However, the high integrity of the fibers from pulps bleached with alternative processes lowered their conformabilities and collapsibility, with consequent reduction of tensile index of the pulp weakly refined. Therefore, with more intensive beating (for printing and writing papers), the tensile index was recovered. The high integrity of the bleaching pulps without pre-O2 makes beating difficulty. To reach the draining degree of 35°SR with the pulps proceeding from alternative processes of bleaching, it was necessary to apply 30% more energy than the reference. |
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PHYSICAL-MECHANICAL PROPERTIES EVALUATION OF PULPS PRODUCED WITH NOVEL BLEACHING SEQUENCESAvaliação das propriedades físico-mecânicas de polpas produzidas por novas sequências de branqueamento.physical-mechanical propertiesmodified cookingbleachingdelignification degreeHexenuronic acidcelluloseEucalyptus.propriedades físico-mecânicascozimento modificadobranqueamentoácidos hexenurônicosceluloseeucaliptoThe efficiency of oxygen delignification is very low for pulps of low number kappa and with high concentrations of hexenuronic acids, therefore the oxygen does not react with these acids, so being minimum the elimination of these during the oxygen delignification (pre-O2) in simple or double stage. In this study, the physical-mechanical properties of pulp of kappa number 17 and 14, produced with modified cooks and with the application of AD(EO)D techniques for pulp of kappa 17 and DHT(EPO)DP for pulp of kappa 14 for the bleaching up to 90% ISO, had been investigated. The main objective of this study was to evaluate the physical-mechanical properties in pulps submitted to the bleaching sequences without oxygen in the beginning of the sequence. As references, cooks had been carried until numbers kappa 17 and 14, oxygen delignification and conventional bleaching for sequences A/D(EO)D for pulp of kappa 17 and DHT(EPO)DP for pulp of kappa 14. The alternative bleaching, without pre-O2, resulted in bleached pulps with bigger integrity that of the reference, what it was confirmed by the values significantly higher of bulk, tear index, opacity and air resistance of the pulp weakly refined (for tissue papers). However, the high integrity of the fibers from pulps bleached with alternative processes lowered their conformabilities and collapsibility, with consequent reduction of tensile index of the pulp weakly refined. Therefore, with more intensive beating (for printing and writing papers), the tensile index was recovered. The high integrity of the bleaching pulps without pre-O2 makes beating difficulty. To reach the draining degree of 35°SR with the pulps proceeding from alternative processes of bleaching, it was necessary to apply 30% more energy than the reference.A eficiência da deslignificação com oxigênio (pré-O2) é muito baixa para polpas de baixo número kappa e que contêm altas concentrações de ácidos hexenurônicos, pois o oxigênio não reage com esses ácidos, sendo mínima a eliminação destes durante a deslignificação com oxigênio em simples ou duplo estágio. Neste estudo, investigaram-se as propriedades físico-mecânicas de polpas produzidas por cozimentos cineticamente modificados até número kappa 17 e 14 e branqueadas pelas técnicas AD(EO)D, para polpa de kappa 17 e DHT(EPO)DP, para polpa de kappa 14. O objetivo principal do estudo foi o de avaliar as propriedades físico-mecânicas das polpas submetidas a sequências de branqueamento sem o oxigênio, no início da sequência. Como referências, foram produzidas polpas de número kappa 17 e 14 as quais foram posteriormente deslignificadas com oxigênio e branqueadas com sequências convencionais: A/D(EO)D, para polpa de número kappa 17 e DHT(EPO)DP, para polpa de kappa 14. O branqueamento alternativo, sem a pré-O2, resultou em polpas branqueadas de maior integridade que as da referência, o que foi comprovado pelos valores significativamente mais altos de VEA (bulk), índice de rasgo, opacidade e resistência à passagem de ar (RPA) da polpa fracamente refinada (polpa para produzir papel tissue). Por outro lado, a alta integridade das fibras oriundas das polpas branqueadas por processos alternativos diminuiu suas conformabilidades e colapsabilidades, com consequente diminuição do índice de tração da polpa fracamente refinada. Porém, mediante um refino mais intenso (polpa para produzir papel de imprimir e escrever - P&W) o índice de tração foi recuperado. A alta integridade das polpas branqueadas sem a pré-O2 dificulta o seu refino. Para alcançar o grau de drenagem de 35oSR com as polpas provenientes dos processos alternativos de branqueamento, foi necessário aplicar cerca de 30% a mais de energia em relação à referência.Universidade Federal de Santa Maria2010-03-30info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://periodicos.ufsm.br/cienciaflorestal/article/view/176610.5902/198050981766Ciência Florestal; Vol. 20 No. 1 (2010); 123-135Ciência Florestal; v. 20 n. 1 (2010); 123-1351980-50980103-9954reponame:Ciência Florestal (Online)instname:Universidade Federal de Santa Maria (UFSM)instacron:UFSMporhttps://periodicos.ufsm.br/cienciaflorestal/article/view/1766/1033Pedrazzi, CristianeColodette, Jorge LuizOliveira, Rubens Chaves deMuguet, Marcelo Coelho dos SantosGomide, José Lívioinfo:eu-repo/semantics/openAccess2017-05-08T11:39:45Zoai:ojs.pkp.sfu.ca:article/1766Revistahttp://www.ufsm.br/cienciaflorestal/ONGhttps://old.scielo.br/oai/scielo-oai.php||cienciaflorestal@ufsm.br|| cienciaflorestal@gmail.com|| cf@smail.ufsm.br1980-50980103-9954opendoar:2017-05-08T11:39:45Ciência Florestal (Online) - Universidade Federal de Santa Maria (UFSM)false |
dc.title.none.fl_str_mv |
PHYSICAL-MECHANICAL PROPERTIES EVALUATION OF PULPS PRODUCED WITH NOVEL BLEACHING SEQUENCES Avaliação das propriedades físico-mecânicas de polpas produzidas por novas sequências de branqueamento. |
title |
PHYSICAL-MECHANICAL PROPERTIES EVALUATION OF PULPS PRODUCED WITH NOVEL BLEACHING SEQUENCES |
spellingShingle |
PHYSICAL-MECHANICAL PROPERTIES EVALUATION OF PULPS PRODUCED WITH NOVEL BLEACHING SEQUENCES Pedrazzi, Cristiane physical-mechanical properties modified cooking bleaching delignification degree Hexenuronic acid cellulose Eucalyptus. propriedades físico-mecânicas cozimento modificado branqueamento ácidos hexenurônicos celulose eucalipto |
title_short |
PHYSICAL-MECHANICAL PROPERTIES EVALUATION OF PULPS PRODUCED WITH NOVEL BLEACHING SEQUENCES |
title_full |
PHYSICAL-MECHANICAL PROPERTIES EVALUATION OF PULPS PRODUCED WITH NOVEL BLEACHING SEQUENCES |
title_fullStr |
PHYSICAL-MECHANICAL PROPERTIES EVALUATION OF PULPS PRODUCED WITH NOVEL BLEACHING SEQUENCES |
title_full_unstemmed |
PHYSICAL-MECHANICAL PROPERTIES EVALUATION OF PULPS PRODUCED WITH NOVEL BLEACHING SEQUENCES |
title_sort |
PHYSICAL-MECHANICAL PROPERTIES EVALUATION OF PULPS PRODUCED WITH NOVEL BLEACHING SEQUENCES |
author |
Pedrazzi, Cristiane |
author_facet |
Pedrazzi, Cristiane Colodette, Jorge Luiz Oliveira, Rubens Chaves de Muguet, Marcelo Coelho dos Santos Gomide, José Lívio |
author_role |
author |
author2 |
Colodette, Jorge Luiz Oliveira, Rubens Chaves de Muguet, Marcelo Coelho dos Santos Gomide, José Lívio |
author2_role |
author author author author |
dc.contributor.author.fl_str_mv |
Pedrazzi, Cristiane Colodette, Jorge Luiz Oliveira, Rubens Chaves de Muguet, Marcelo Coelho dos Santos Gomide, José Lívio |
dc.subject.por.fl_str_mv |
physical-mechanical properties modified cooking bleaching delignification degree Hexenuronic acid cellulose Eucalyptus. propriedades físico-mecânicas cozimento modificado branqueamento ácidos hexenurônicos celulose eucalipto |
topic |
physical-mechanical properties modified cooking bleaching delignification degree Hexenuronic acid cellulose Eucalyptus. propriedades físico-mecânicas cozimento modificado branqueamento ácidos hexenurônicos celulose eucalipto |
description |
The efficiency of oxygen delignification is very low for pulps of low number kappa and with high concentrations of hexenuronic acids, therefore the oxygen does not react with these acids, so being minimum the elimination of these during the oxygen delignification (pre-O2) in simple or double stage. In this study, the physical-mechanical properties of pulp of kappa number 17 and 14, produced with modified cooks and with the application of AD(EO)D techniques for pulp of kappa 17 and DHT(EPO)DP for pulp of kappa 14 for the bleaching up to 90% ISO, had been investigated. The main objective of this study was to evaluate the physical-mechanical properties in pulps submitted to the bleaching sequences without oxygen in the beginning of the sequence. As references, cooks had been carried until numbers kappa 17 and 14, oxygen delignification and conventional bleaching for sequences A/D(EO)D for pulp of kappa 17 and DHT(EPO)DP for pulp of kappa 14. The alternative bleaching, without pre-O2, resulted in bleached pulps with bigger integrity that of the reference, what it was confirmed by the values significantly higher of bulk, tear index, opacity and air resistance of the pulp weakly refined (for tissue papers). However, the high integrity of the fibers from pulps bleached with alternative processes lowered their conformabilities and collapsibility, with consequent reduction of tensile index of the pulp weakly refined. Therefore, with more intensive beating (for printing and writing papers), the tensile index was recovered. The high integrity of the bleaching pulps without pre-O2 makes beating difficulty. To reach the draining degree of 35°SR with the pulps proceeding from alternative processes of bleaching, it was necessary to apply 30% more energy than the reference. |
publishDate |
2010 |
dc.date.none.fl_str_mv |
2010-03-30 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
https://periodicos.ufsm.br/cienciaflorestal/article/view/1766 10.5902/198050981766 |
url |
https://periodicos.ufsm.br/cienciaflorestal/article/view/1766 |
identifier_str_mv |
10.5902/198050981766 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.relation.none.fl_str_mv |
https://periodicos.ufsm.br/cienciaflorestal/article/view/1766/1033 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Universidade Federal de Santa Maria |
publisher.none.fl_str_mv |
Universidade Federal de Santa Maria |
dc.source.none.fl_str_mv |
Ciência Florestal; Vol. 20 No. 1 (2010); 123-135 Ciência Florestal; v. 20 n. 1 (2010); 123-135 1980-5098 0103-9954 reponame:Ciência Florestal (Online) instname:Universidade Federal de Santa Maria (UFSM) instacron:UFSM |
instname_str |
Universidade Federal de Santa Maria (UFSM) |
instacron_str |
UFSM |
institution |
UFSM |
reponame_str |
Ciência Florestal (Online) |
collection |
Ciência Florestal (Online) |
repository.name.fl_str_mv |
Ciência Florestal (Online) - Universidade Federal de Santa Maria (UFSM) |
repository.mail.fl_str_mv |
||cienciaflorestal@ufsm.br|| cienciaflorestal@gmail.com|| cf@smail.ufsm.br |
_version_ |
1799944126124261376 |