The importance of the measurement of paper differential CD shrinkage

Detalhes bibliográficos
Autor(a) principal: Mendes, Afonso H. T.
Data de Publicação: 2012
Outros Autores: Kim, Hae Y., Ferreira, Paulo J. T., Park, Song W.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10316/33052
Resumo: During the drying stage of the papermaking process, paper undergoes dimensional changes caused by fiber dehydration, but exhibiting uneven width reduction magnitudes along the cross-machine direction. The degree of cross-direction (CD) shrinkage can be very different at the edges when compared to the center of the web. The highest shrinkage amplitude at the web edges can vary according to the operation conditions and the drying section configuration, as well. The difference in the degree of CD shrinkage gives rise to adverse effects on the finished CD paper sheet properties, particularly strength and hygroelastic properties, which can vary many percents from the edges to the center of the web. Extreme property values lead to different problems, such as sheet differential dimensional instability, which can limit paper quality and converting efficiency, especially in high speed machines (e.g., multi-color offset printing and office copier machines). The issues considered above make clear the advantages of measuring and carefully analyzing the differential CD shrinkage profile of finished paper. This work reviews the CD differential shrinkage profile development in the drying section, its impact on finished paper properties and presents an accurate and low cost measurement method based on image analysis techniques, supported by digital processing through the two-dimensional Fast Fourier Transform (2D-FFT). The experimental results show that image analysis applied to paper samples taken from the jumbo roll represents a reliable method for determining the differential CD shrinkage profile, and a practical tool for monitoring paper quality and evaluating its CD dimensional stability profile.
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spelling The importance of the measurement of paper differential CD shrinkageDimensional stabilityHygroexpansabilityPaper image analysisReprographic paperShrinkageDuring the drying stage of the papermaking process, paper undergoes dimensional changes caused by fiber dehydration, but exhibiting uneven width reduction magnitudes along the cross-machine direction. The degree of cross-direction (CD) shrinkage can be very different at the edges when compared to the center of the web. The highest shrinkage amplitude at the web edges can vary according to the operation conditions and the drying section configuration, as well. The difference in the degree of CD shrinkage gives rise to adverse effects on the finished CD paper sheet properties, particularly strength and hygroelastic properties, which can vary many percents from the edges to the center of the web. Extreme property values lead to different problems, such as sheet differential dimensional instability, which can limit paper quality and converting efficiency, especially in high speed machines (e.g., multi-color offset printing and office copier machines). The issues considered above make clear the advantages of measuring and carefully analyzing the differential CD shrinkage profile of finished paper. This work reviews the CD differential shrinkage profile development in the drying section, its impact on finished paper properties and presents an accurate and low cost measurement method based on image analysis techniques, supported by digital processing through the two-dimensional Fast Fourier Transform (2D-FFT). The experimental results show that image analysis applied to paper samples taken from the jumbo roll represents a reliable method for determining the differential CD shrinkage profile, and a practical tool for monitoring paper quality and evaluating its CD dimensional stability profile.ABTCP2012info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://hdl.handle.net/10316/33052http://hdl.handle.net/10316/33052engAfonso H. T. Mendes, Hae Y. Kim. Paulo J. T. Ferreira, Song W. Park (2012) – The importance of the measurement of paper differential CD shrinkage, O Papel (Revista da Associação Brasileira de Tecnologia em Celulose e Papel), LXXIII (2), 45-50.0031-1057Mendes, Afonso H. T.Kim, Hae Y.Ferreira, Paulo J. T.Park, Song W.info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2021-09-28T09:37:41Zoai:estudogeral.uc.pt:10316/33052Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T20:59:12.822850Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv The importance of the measurement of paper differential CD shrinkage
title The importance of the measurement of paper differential CD shrinkage
spellingShingle The importance of the measurement of paper differential CD shrinkage
Mendes, Afonso H. T.
Dimensional stability
Hygroexpansability
Paper image analysis
Reprographic paper
Shrinkage
title_short The importance of the measurement of paper differential CD shrinkage
title_full The importance of the measurement of paper differential CD shrinkage
title_fullStr The importance of the measurement of paper differential CD shrinkage
title_full_unstemmed The importance of the measurement of paper differential CD shrinkage
title_sort The importance of the measurement of paper differential CD shrinkage
author Mendes, Afonso H. T.
author_facet Mendes, Afonso H. T.
Kim, Hae Y.
Ferreira, Paulo J. T.
Park, Song W.
author_role author
author2 Kim, Hae Y.
Ferreira, Paulo J. T.
Park, Song W.
author2_role author
author
author
dc.contributor.author.fl_str_mv Mendes, Afonso H. T.
Kim, Hae Y.
Ferreira, Paulo J. T.
Park, Song W.
dc.subject.por.fl_str_mv Dimensional stability
Hygroexpansability
Paper image analysis
Reprographic paper
Shrinkage
topic Dimensional stability
Hygroexpansability
Paper image analysis
Reprographic paper
Shrinkage
description During the drying stage of the papermaking process, paper undergoes dimensional changes caused by fiber dehydration, but exhibiting uneven width reduction magnitudes along the cross-machine direction. The degree of cross-direction (CD) shrinkage can be very different at the edges when compared to the center of the web. The highest shrinkage amplitude at the web edges can vary according to the operation conditions and the drying section configuration, as well. The difference in the degree of CD shrinkage gives rise to adverse effects on the finished CD paper sheet properties, particularly strength and hygroelastic properties, which can vary many percents from the edges to the center of the web. Extreme property values lead to different problems, such as sheet differential dimensional instability, which can limit paper quality and converting efficiency, especially in high speed machines (e.g., multi-color offset printing and office copier machines). The issues considered above make clear the advantages of measuring and carefully analyzing the differential CD shrinkage profile of finished paper. This work reviews the CD differential shrinkage profile development in the drying section, its impact on finished paper properties and presents an accurate and low cost measurement method based on image analysis techniques, supported by digital processing through the two-dimensional Fast Fourier Transform (2D-FFT). The experimental results show that image analysis applied to paper samples taken from the jumbo roll represents a reliable method for determining the differential CD shrinkage profile, and a practical tool for monitoring paper quality and evaluating its CD dimensional stability profile.
publishDate 2012
dc.date.none.fl_str_mv 2012
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/10316/33052
http://hdl.handle.net/10316/33052
url http://hdl.handle.net/10316/33052
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Afonso H. T. Mendes, Hae Y. Kim. Paulo J. T. Ferreira, Song W. Park (2012) – The importance of the measurement of paper differential CD shrinkage, O Papel (Revista da Associação Brasileira de Tecnologia em Celulose e Papel), LXXIII (2), 45-50.
0031-1057
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
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dc.publisher.none.fl_str_mv ABTCP
publisher.none.fl_str_mv ABTCP
dc.source.none.fl_str_mv reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
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