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Analysis of Spotty Deposits on Fine Paper and Investigation of Key Factors Affecting Alkyl Ketene Dimer Spot Formation
[Image: see text] Defect spots degrade paper quality and often cause sheet breaks and other problems in the subsequent coating process. We encountered sporadic surges of defect spots on paper from a paper machine producing printing and writing grades of paper. We found that white or light-colored fi...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
American Chemical Society
2020
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7331058/ https://www.ncbi.nlm.nih.gov/pubmed/32637828 http://dx.doi.org/10.1021/acsomega.0c01673 |
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author | Lee, Kyong Ho Youn, Hye Jung Lee, Hak Lae |
author_facet | Lee, Kyong Ho Youn, Hye Jung Lee, Hak Lae |
author_sort | Lee, Kyong Ho |
collection | PubMed |
description | [Image: see text] Defect spots degrade paper quality and often cause sheet breaks and other problems in the subsequent coating process. We encountered sporadic surges of defect spots on paper from a paper machine producing printing and writing grades of paper. We found that white or light-colored filler spots and waxy, translucent, elliptical spots accounted for 27.3 and 34.4% of these defects, respectively, and that both types of defect contained unhydrolyzed AKD as a major component. Paper machine’s wet-end deposits, however, did not contain unhydrolyzed AKD as a deposit component. We hypothesized that the colloidal stability of AKD was the main factor causing the increase in spot defects, and we verified this by deposit testing experiments. Among the papermaking additives tested, bentonite caused the most significant increase in AKD deposition during testing, which was attributed to its causing the electrostatic coagulation of cationically charged AKD emulsion particles. In contrast, anionically charged AKD emulsions showed improved stability and less deposit formation in the presence of bentonite. |
format | Online Article Text |
id | pubmed-7331058 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | American Chemical Society |
record_format | MEDLINE/PubMed |
spelling | pubmed-73310582020-07-06 Analysis of Spotty Deposits on Fine Paper and Investigation of Key Factors Affecting Alkyl Ketene Dimer Spot Formation Lee, Kyong Ho Youn, Hye Jung Lee, Hak Lae ACS Omega [Image: see text] Defect spots degrade paper quality and often cause sheet breaks and other problems in the subsequent coating process. We encountered sporadic surges of defect spots on paper from a paper machine producing printing and writing grades of paper. We found that white or light-colored filler spots and waxy, translucent, elliptical spots accounted for 27.3 and 34.4% of these defects, respectively, and that both types of defect contained unhydrolyzed AKD as a major component. Paper machine’s wet-end deposits, however, did not contain unhydrolyzed AKD as a deposit component. We hypothesized that the colloidal stability of AKD was the main factor causing the increase in spot defects, and we verified this by deposit testing experiments. Among the papermaking additives tested, bentonite caused the most significant increase in AKD deposition during testing, which was attributed to its causing the electrostatic coagulation of cationically charged AKD emulsion particles. In contrast, anionically charged AKD emulsions showed improved stability and less deposit formation in the presence of bentonite. American Chemical Society 2020-06-18 /pmc/articles/PMC7331058/ /pubmed/32637828 http://dx.doi.org/10.1021/acsomega.0c01673 Text en Copyright © 2020 American Chemical Society This is an open access article published under an ACS AuthorChoice License (http://pubs.acs.org/page/policy/authorchoice_termsofuse.html) , which permits copying and redistribution of the article or any adaptations for non-commercial purposes. |
spellingShingle | Lee, Kyong Ho Youn, Hye Jung Lee, Hak Lae Analysis of Spotty Deposits on Fine Paper and Investigation of Key Factors Affecting Alkyl Ketene Dimer Spot Formation |
title | Analysis of Spotty Deposits on Fine Paper and Investigation
of Key Factors Affecting Alkyl Ketene Dimer Spot Formation |
title_full | Analysis of Spotty Deposits on Fine Paper and Investigation
of Key Factors Affecting Alkyl Ketene Dimer Spot Formation |
title_fullStr | Analysis of Spotty Deposits on Fine Paper and Investigation
of Key Factors Affecting Alkyl Ketene Dimer Spot Formation |
title_full_unstemmed | Analysis of Spotty Deposits on Fine Paper and Investigation
of Key Factors Affecting Alkyl Ketene Dimer Spot Formation |
title_short | Analysis of Spotty Deposits on Fine Paper and Investigation
of Key Factors Affecting Alkyl Ketene Dimer Spot Formation |
title_sort | analysis of spotty deposits on fine paper and investigation
of key factors affecting alkyl ketene dimer spot formation |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7331058/ https://www.ncbi.nlm.nih.gov/pubmed/32637828 http://dx.doi.org/10.1021/acsomega.0c01673 |
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