Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
The influence of pH on fiber and paper properties: Different pH levels during beating and sheet forming
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences.
2015 (English)Independent thesis Advanced level (degree of Master (Two Years)), 300 HE creditsStudent thesisAlternative title
Inverkan av pH på fiber- och pappersegenskaper : Olika pH-nivåer vid malning och arkformning (Swedish)
Abstract [en]

The effect of pH on fiber and paper properties, during beating and sheet formation, was investigated for three different pulps. The pulps were pH adjusted to four different pH levels between 3 and 9. Isotropic laboratory sheet were made of both unbeaten and beaten pulps. The beaten neutral sulfite semi-chemical pulp and bleached softwood kraft pulp were affected by changes in pH; bleached softwood kraft pulp in a minor extent due to less fiber surface charges. Compared to the other pH levels, pH 3 showed a lower fiber surface charge, water retention value, tensile index, tensile stiffness index, compressive index and edge crush resistance index. SEM pictures showed a denser network at pH 9 than for pH 3. This was seen for both neutral sulphite semi-chemical and softwood kraft pulp. The unbeaten pulps and beaten bleached hardwood kraft pulp were not affected by changes in pH. SEM pictures showed no difference in the fiber network for bleached hardwood kraft pulp. A mill trial, with neutral sulphite semi-chemical pulp, at pH levels between pH 4.8 and pH 5.6 was completed. No significant difference was seen for any mechanical property.

Place, publisher, year, edition, pages
2015. , 43 p.
Keyword [en]
pH, beating, WRV, fiber charge
National Category
Chemical Engineering
Identifiers
URN: urn:nbn:se:kau:diva-36514OAI: oai:DiVA.org:kau-36514DiVA: diva2:823180
External cooperation
BillerudKorsnäs
Subject / course
Chemistry
Educational program
Engineering: Chemical Engineering (300 ECTS credits)
Supervisors
Examiners
Available from: 2015-06-18 Created: 2015-06-17 Last updated: 2015-06-18Bibliographically approved

Open Access in DiVA

The influence of pH on fiber and paper properties(1926 kB)31804 downloads
File information
File name FULLTEXT01.pdfFile size 1926 kBChecksum SHA-512
306c9eaafe680d3daebb4afb9d1c9760ea68d42f36e828cbd36d6079f00214ddffe72d11c3645590c0d73952285faa8855b88737e36975d96dbad8dff4af0043
Type fulltextMimetype application/pdf
fulltext(1794 kB)136 downloads
File information
File name FULLTEXT02.pdfFile size 1794 kBChecksum SHA-512
b53f4a94f2deb4452af512ebbada5c419683447ebe2890d9bce709f7d7242b74598f47bada3574caad2f425256202177df6855d97e093c5d2456ebd832f078c8
Type fulltextMimetype application/pdf

By organisation
Department of Engineering and Chemical Sciences
Chemical Engineering

Search outside of DiVA

GoogleGoogle Scholar
Total: 31940 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

urn-nbn

Altmetric score

urn-nbn
Total: 471 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf