Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • 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
Barrier and Surface Properties of Chitosan-Coated Greaseproof Paper
Karlstad University, Faculty of Technology and Science.
STFI-Packforsk - Packaging and Logistics, Stockholm.
Karlstad University, Faculty of Technology and Science.
Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Technology and Science, Paper Surface Centre.ORCID iD: 0000-0002-1256-1708
2006 (English)In: Carbohydrate Polymers, ISSN 0144-8617, E-ISSN 1879-1344, Vol. 65, no 4, 453-460 p.Article in journal (Refereed) Published
Place, publisher, year, edition, pages
2006. Vol. 65, no 4, 453-460 p.
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:kau:diva-1981DOI: 10.1016/j.carbpol.2006.02.005OAI: oai:DiVA.org:kau-1981DiVA: diva2:5287
Available from: 2008-02-08 Created: 2008-02-08 Last updated: 2015-10-19Bibliographically approved
In thesis
1. Barrier properties of greaseproof paper
Open this publication in new window or tab >>Barrier properties of greaseproof paper
2005 (English)Licentiate thesis, comprehensive summary (Other scientific)
Abstract [en]

The barrier properties of greaseproof paper are achieved by extensive beating of the fibres. This treatment results in high costs for energy, both as beating energy and drying energy. A full-scale trial has been performed to investigate the role of the pulp with respect to energy demand and the barrier properties of the final papers. The paper made of 100% sulphite pulp with a low degree of beating showed the lowest energy consumption at a given level of barrier properties such as air permeance, grease resistance and water vapour transmission rate.

The papers produced in the full-scale trial have been used as substrates for coating. Greaseproof paper has a closed surface and should therefore be a good base paper for barrier coatings.

Chitosan has been used as a barrier coating because of its good oxygen barrier properties. Moreover, chitosan is a renewable material. Coating trials on a bench-scale showed that greaseproof paper can be upgraded to provide a good oxygen barrier. The oxygen barrier could not be achieved on a pilot-scale using the metered size press technique, because of the low coat weight applied.

The influence of the base paper on the barrier properties of chitosan-coated paper has been investigated. It was found that greaseproof paper is better than a paper with a higher porosity. The coating seemed to stay more on the surface of the greaseproof papers and to form a continuous coating layer with better barrier properties.

Place, publisher, year, edition, pages
Institutionen för kemi, 2005
Series
Karlstad University Studies, ISSN 1403-8099 ; 2005:17
National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-1411 (URN)91-85335-57-6 (ISBN)
Presentation
2005-05-14, Nyqvistsalen, 9C 203, Karlstads universitet, Karlstad, 09:00
Opponent
Supervisors
Available from: 2008-02-08 Created: 2008-02-08 Last updated: 2010-09-17
2. Influence of paper properties and polymer coatings on barrier properties of greaseproof paper
Open this publication in new window or tab >>Influence of paper properties and polymer coatings on barrier properties of greaseproof paper
2007 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

Greaseproof paper has a dense structure and therefore provides a natural barrier against materials like fat and oils. The barrier is obtained by extensive refining of the pulp. This refining is however a costly operation, not only in terms of direct costs for the refining but also in terms of indirect costs because the energy consumption for the drying of the paper is affected by the refining. A full-scale trial was performed to investigate the role of the pulp with respect to the energy demand and the barrier properties of the final papers. Paper made of 100% sulphite pulp with a low degree of refining exhibited the lowest energy consumption at a given level of air permeance. In addition, the effect of refining on the air permeance was compared with that of calendering. The calendering affected the air permeance less than the refining. The papers produced in the full-scale trial were later used as substrates for coatings and for detailed studies of the paper structure. Coating with chitosan was examined on a bench-scale and on a pilot scale. The studies showed that greaseproof paper can be upgraded with an oxygen barrier, but also that suitable coating techniques are lacking for the application of the coating in a sufficient amount. The influence of the base paper on the barrier properties of chitosan-coated paper was investigated in another study, in which it was found that greaseproof paper possesses a unique coating hold-out which cannot be met by other types of paper with a more open structure. It was also found that the coated paper had a lower oxygen permeability than the chitosan coating itself, and this indicates that the dense surface layer of greaseproof paper contributed to the oxygen permeability of the coated paper. The pore volume fraction of the greaseproof paper was found to be approximately 40% and it is therefore surprising that its air permeance is so low. To bring understanding to this question, the structure of greaseproof paper was studied using several methods. It was found that the structure was dominated by very small pores with a median diameter of <0.3 µm. The fraction of closed pores was also substantial. A porosity gradient was also found, indicating that the papers used in the study had a closed surface. The hypothesis that the surface layer of the paper contributed to the oxygen barrier was tested in an experiment in which greaseproof paper was extrusion-coated with polyethylene. The oxygen permeability was measured at 0%, 50% and 90% relative humidity, and the permeability was found to increase with increasing moisture content. Because only the cellulose layer in the paper and not the polyethylene layer in the coating is affected by moisture, this result supports the hypothesis that the surface layer of the paper contributed to the oxygen barrier properties of the coated paper.

Place, publisher, year, edition, pages
Karlstad: Karlstads universitet, 2007
Series
Karlstad University Studies, ISSN 1403-8099 ; 2007:40
Keyword
Greaseproof paper, Barrier properties, Gas barrier, Paper properties, Coatings
National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-1238 (URN)978-91-7063-144-3 (ISBN)
Public defence
2007-11-30, 203, 9C, Nyqvistsalen, Karlstad, 10:00
Opponent
Supervisors
Available from: 2007-11-09 Created: 2007-11-09 Last updated: 2010-09-17

Open Access in DiVA

No full text

Other links

Publisher's full text

Search in DiVA

By author/editor
Järnström, Lars
By organisation
Faculty of Technology and ScienceDepartment of Chemical EngineeringPaper Surface Centre
In the same journal
Carbohydrate Polymers
Chemical Sciences

Search outside of DiVA

GoogleGoogle Scholar

Altmetric score

Total: 136 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • 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