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Structural Studies and Modelling of Oxygen Transport in Barrier Materials for Food Packaging
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences.
2014 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

The requirements of food packages are to ensure food safety and quality, to minimize spoilage, and to provide an easy way to store and handle food. To meet these demands for fibre-based food packages, barrier coatings are generally used to regulate the amount of gases entering a package, as some gases are detrimental to food quality. Oxygen, for example, initiates lipid oxidation in fatty foods. Bakery products may also be sensitive to oxygen.

This thesis focused on mass transport of oxygen in order to gain deeper knowledge in the performance of barrier coatings and to develop means to optimize the performance of barrier coatings. This experimental study along with computer modelling characterized the structure of barrier materials with respect to the mass transport process.This project was performed as part of the multidisciplinary industrial graduate school VIPP (www.kau.se/en/vipp) - Values Created in Fibre Based Processes and Products – at Karlstad University, with the financial support from the Knowledge Foundation, Sweden, and Stora Enso.

Place, publisher, year, edition, pages
Karlstad: Karlstads universitet, 2014. , 45 p.
Series
Karlstad University Studies, ISSN 1403-8099 ; 2014:64
Keyword [en]
Barrier coating; Permeability; Dynamic Mass Transport; Modeling; Diffusion; Polymer; Dispersion; Kaolin
National Category
Polymer Technologies Chemical Engineering
Research subject
Materials Science
Identifiers
URN: urn:nbn:se:kau:diva-34468ISBN: 978-91-7063-604-2 (print)OAI: oai:DiVA.org:kau-34468DiVA: diva2:757661
Presentation
2014-12-11, Eva Eriksson, 21A 342, 10:15 (Swedish)
Opponent
Supervisors
Note

Artikel 2 "The influence of clay orientation..." ingick som manuskript i avhandlingen, då med titeln: "Influence of clay orientation in dispersion barrier coatings on oxygen permeation". Nu publicerad.

Available from: 2014-11-20 Created: 2014-10-23 Last updated: 2017-12-05Bibliographically approved
List of papers
1. Influence of kaolin addition on the dynamics of oxygen mass transport in polyvinyl alcohol dispersion coatings
Open this publication in new window or tab >>Influence of kaolin addition on the dynamics of oxygen mass transport in polyvinyl alcohol dispersion coatings
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2015 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 30, no 3, 385-392 p.Article in journal (Refereed) Published
Abstract [en]

The permeability of dispersion barriers produced from polyvinyl alcohol (PVOH) and kaolin clay blends coated onto polymeric supports has been studied by employing two different measurement methods: the oxygen transmission rate (OTR) and the ambient oxygen ingress rate (AOIR). Coatings with different thicknesses and kaolin contents were studied. Structural information of the dispersion-barrier coatings was obtained by Fourier transform infrared spectroscopy (FTIR) spectroscopy and scanning electron microscopy (SEM). These results showed that the kaolin content influences both the orientation of the kaolin and the degree of crystallinity of the PVOH coating. Increased kaolin content increased the alignment of the kaolin platelets to the basal plane of the coating. Higher kaolin content was accompanied by higher degree of crystallinity of the PVOH. The barrier thickness proved to be less important in the early stages of the mass transport process, whereas it had a significant influence on the steady-state permeability. The results from this study demonstrate the need for better understanding of how permeability is influenced by (chemical and physical) structure.

Keyword
Barrier coating, Dynamic mass transport, Kaolin, Permeability, Polyvinyl alcohol
National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-34457 (URN)10.3183/NPPRJ-2015-30-03-p385-392 (DOI)000361615500002 ()
Funder
Knowledge Foundation
Note

Ingår i lic.uppsats Structural Studies and Modelling of Oxygen Transport in Barrier Materials for Food Packaging som manuskript med titeln: Influence of kaolin addition in polyvinyl alcohol dispersion coating on the dynamics of oxygen mass transport.

Available from: 2014-10-22 Created: 2014-10-22 Last updated: 2017-12-06Bibliographically approved
2. The influence of clay orientation and crystallinity on oxygen permeation in dispersion barrier coatings
Open this publication in new window or tab >>The influence of clay orientation and crystallinity on oxygen permeation in dispersion barrier coatings
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2016 (English)In: Applied Clay Science, ISSN 0169-1317, E-ISSN 1872-9053, Vol. 126, 17-24 p.Article in journal (Refereed) Published
Abstract [en]

In this study oxygen permeability in dispersion barriers produced from poly(vinyl alcohol) (PVOH) and kaolin clay blends coated onto polymeric supports was investigated. To determine the oxygen permeability, two measurement methods were used: the oxygen transmission rate (OTR) and the ambient oxygen ingress rate (AOIR). It was found that with increasing kaolin content the oxygen permeability increased, up to about 5 wt% kaolin, whereafter the oxygen permeability decreased, as was expected. The increased (> 5%) kaolin loading lowered the diffusion because of an increased tortuosity. Structural information about the dispersion-barrier coatings, such as kaolin orientation and polymer crystallinity, was obtained from Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). Kaolin orientation was influenced by the drying temperature, the thickness of the samples, and the kaolin concentration. The polymer crystallinity increased in thicker samples. The drying temperature did not show any clear effect on the crystallinity of thin samples, while for the thicker barriers, combined with a kaolin concentration lower than 20 wt%, a higher crystallinity was achieved at lower drying temperatures. This study demonstrates the strong influence of chemical and physical structures on the permeability of the investigated coatings.

Keyword
Barrier coating; Kaolin; Polyvinyl alcohol; Permeability; Dynamic mass transport; Crystallinity; Kaolin orientation
National Category
Chemical Engineering
Research subject
Materials Engineering
Identifiers
urn:nbn:se:kau:diva-41069 (URN)10.1016/j.clay.2016.02.029 (DOI)000376213900003 ()
Funder
Knowledge Foundation, 20100268
Available from: 2016-03-16 Created: 2016-03-16 Last updated: 2017-11-30Bibliographically approved
3. Modeling of oxygen diffusion through flake-filled polymeric layers applied to barrier coatings
Open this publication in new window or tab >>Modeling of oxygen diffusion through flake-filled polymeric layers applied to barrier coatings
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2014 (English)Manuscript (preprint) (Other academic)
National Category
Chemical Engineering
Research subject
Materials Engineering
Identifiers
urn:nbn:se:kau:diva-34459 (URN)
Available from: 2014-10-22 Created: 2014-10-22 Last updated: 2015-10-21Bibliographically approved

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