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Publications (10 of 248) Show all publications
Javed, A., Ullsten, H. & Järnström, L. (2016). Effects on Oxygen-barrier Properties of Pretreating Paperboard with a Starch–Poly(Vinyl Alcohol) Blend before Polyethylene Extrusion. Packaging technology and science
Open this publication in new window or tab >>Effects on Oxygen-barrier Properties of Pretreating Paperboard with a Starch–Poly(Vinyl Alcohol) Blend before Polyethylene Extrusion
2016 (English)In: Packaging technology and science, ISSN 0894-3214Article in journal (Refereed) Published
Place, publisher, year, edition, pages
John Wiley & Sons, 2016
National Category
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-38336 (URN)10.1002/pts.2210 (DOI)
Note

ej publicerats än

Available from: 2015-11-06 Created: 2015-11-06 Last updated: 2018-03-26Bibliographically approved
Javed, A., Ullsten, H., Ernstsson, M. & Järnström, L. (2016). Study of starch and starch-PVOH blends and effects of plasticizers on mechanical and barrier properties of coated paperboard. Nordic Pulp & Paper Research Journal, 31(3), 499-510
Open this publication in new window or tab >>Study of starch and starch-PVOH blends and effects of plasticizers on mechanical and barrier properties of coated paperboard
2016 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 31, no 3, p. 499-510Article in journal (Refereed) Published
Abstract [en]

The mechanical properties of self-supporting films based on starch-plasticizer and starch-PVOH-plasticizer and the barrier properties of paperboard coated with solutions of these polymers have been studied. The plasticizers used were glycerol, polyethylene glycol and citric acid. It was shown that the addition of a plasticizer and PVOH to starch substantially increases the flexibility of starch films. It was seen that curing the self-supporting films led to a decrease in flexibility. After heat-treatment, a substantial increase in storage modulus was observed only in the starch-PVOH-citric-acid blend films. Tensile tests on the films indicate that citric acid did not cause any noticeable phase separation. Citric acid acted as a compatibilizer for starch-PVOH blends even though a similar enrichment of PVOH at the air-solid interface was observed with both citric acid and polyethylene glycol as plasticizer. The properties of barrier coatings greatly reflected the compatibility of starch-PVOH blends containing citric acid. The only plasticizer that resulted in a lower water vapour transmission rate through the starch and starch-PVOH coatings was citric acid, which suggests that cross-linking took place. With four layers, coatings based of starch-PVOH possessed the same oxygen-transmission rate with citric acid as without citric acid.

Place, publisher, year, edition, pages
AB SVENSK PAPPERSTIDNING, 2016
Keyword
Citric acid; Glycerol; Polyethylene glycol; Barrier coatings; Starch; Mechanical properties
National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-38334 (URN)000387976000010 ()
Available from: 2015-11-06 Created: 2015-11-06 Last updated: 2018-03-26Bibliographically approved
Nyflött, Å., Moons, E., Bonnerup, C., Gunilla, C., Järnström, L. & Lestelius, M. (2016). The influence of clay orientation and crystallinity on oxygen permeation in dispersion barrier coatings. Applied Clay Science, 126, 17-24
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, p. 17-24Article 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
Olsson, E., Johansson, C. & Järnström, L. (2015). Impact of dispersing agents on the flow behaviour of montmorillonite-starch coating formulations. In: Annual Transactions of the Nordic Rheology Society: . Paper presented at 24th Nordic Rheology Conference, August 19-20, 2015, Karlstad (pp. 143-150). The Nordic Reology Society, 23
Open this publication in new window or tab >>Impact of dispersing agents on the flow behaviour of montmorillonite-starch coating formulations
2015 (English)In: Annual Transactions of the Nordic Rheology Society, The Nordic Reology Society , 2015, Vol. 23, p. 143-150Conference paper, Published paper (Other academic)
Place, publisher, year, edition, pages
The Nordic Reology Society, 2015
Series
Annual Transactions of the Nordic Rheology Society, ISSN 1601-4057 ; 2015
National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-44413 (URN)978-91-637-9104-8 (ISBN)
Conference
24th Nordic Rheology Conference, August 19-20, 2015, Karlstad
Available from: 2016-07-06 Created: 2016-07-06 Last updated: 2016-07-06Bibliographically approved
Nyflött, Å., Axrup, L., Gunilla, C., Järnström, L., Lestelius, M., Moons, E. & Wahlström, T. (2015). Influence of kaolin addition on the dynamics of oxygen mass transport in polyvinyl alcohol dispersion coatings. Nordic Pulp & Paper Research Journal, 30(3), 385-392
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, p. 385-392Article 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
Mesic, B. B., Järnström, L. & Johnston, J. (2015). Latex-based barrier dispersion coating on linerboard: Flexographic multilayering versus single step conventional coating technology. Nordic Pulp & Paper Research Journal, 30(2), 349-359
Open this publication in new window or tab >>Latex-based barrier dispersion coating on linerboard: Flexographic multilayering versus single step conventional coating technology
2015 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 30, no 2, p. 349-359Article in journal (Refereed) Published
Abstract [en]

The aim of this study was to investigate the possibility of using the flexographic printing process for the deposition of multilayered latex-based barrier dispersion coatings on linerboard to improve its moisture barrier properties. A coating formulation developed for a conventional coater has been tested using a flexographic printing web press. The performance of multi-layering of up to six layers was compared with a single step conventional coating process in terms of runnability and barrier performance. A commercial linerboard was used as substrate for both processes. The coated linerboard samples were examined using scanning electron microscopy and surface profiling, and were characterized with respect to their coating grammage, WVTR and water absorption (Cobb(120)) properties. The impact of waxes on water absorption was also investigated for the two coating strategies. The results show that for a similar total coating grammage ( about 6 g m(-2)), samples coated using the flexographic press showed better barrier performance and less cracks on the coated surfaces than samples coated using a conventional coating process.

Place, publisher, year, edition, pages
SPCI, 2015
Keyword
Flexography, Multilayering, Latex-based, Barrier, Dispersion
National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-41649 (URN)000354806700022 ()edselc.2-52.0-84951968673 (Scopus ID)
Available from: 2016-04-11 Created: 2016-04-11 Last updated: 2017-11-30Bibliographically approved
Johansson, K., Gillgren, T., Winestrand, S., Järnström, L. & Jonsson, L. J. (2014). Comparison of lignin derivatives as substrates for laccase-catalyzed scavenging of oxygen in coatings and films. Journal of Biological Engineering, 8, Article ID 1.
Open this publication in new window or tab >>Comparison of lignin derivatives as substrates for laccase-catalyzed scavenging of oxygen in coatings and films
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2014 (English)In: Journal of Biological Engineering, ISSN 1754-1611, E-ISSN 1754-1611, Vol. 8, article id 1Article in journal (Refereed) Published
Abstract [en]

Background: Lignin derivatives are phenylpropanoid biopolymers derived from pulping and biorefinery processes. The possibility to utilize lignin derivatives from different types of processes in advanced enzyme-catalyzed oxygen-scavenging systems intended for active packaging was explored. Laccase-catalyzed oxidation of alkali lignin (LA), hydrolytic lignin (LH), organosolv lignin (LO), and lignosulfonates (LS) was compared using oxygen-scavenging coatings and films in liquid and gas phase systems. Results: When coatings containing lignin derivatives and laccase were immersed in a buffered aqueous solution, the oxygen-scavenging capability increased in the order LO < LH < LA < LS. Experiments with coatings containing laccase and LO, LH or LA incubated in oxygen-containing gas in air-tight chambers and at a relative humidity (RH) of 100% showed that paperboard coated with LO and laccase reduced the oxygen content from 1.0% to 0.4% during a four-day period, which was far better than the results obtained with LA or LH. LO-containing coatings incubated at 92% RH also displayed activity, with a decrease in oxygen from 1.0% to 0.7% during a four-day period. The oxygen scavenging was not related to the content of free phenolic hydroxyl groups, which increased in the order LO < LS < LH < LA. LO and LS were selected for further studies and films containing starch, clay, glycerol, laccase and LO or LS were characterized using gel permeation chromatograpy, dynamic mechanical analysis, and wet stability. Conclusions: The investigation shows that different lignin derivatives exhibit widely different properties as a part of active coatings and films. Results indicate that LS and LO were most suitable for the application studied and differences between them were attributed to a higher degree of laccase-catalyzed cross-linking of LS than of LO. Inclusion in active-packaging systems offers a new way to utilize some types of lignin derivatives from biorefining processes.

Place, publisher, year, edition, pages
BioMed Central, 2014
Keyword
Lignin derivatives, Laccase, Coating, Film, Oxygen scavenger
National Category
Biological Sciences Chemical Sciences
Identifiers
urn:nbn:se:kau:diva-41556 (URN)10.1186/1754-1611-8-1 (DOI)000335792000001 ()24382027 (PubMedID)
Available from: 2016-04-25 Created: 2016-04-11 Last updated: 2017-11-30Bibliographically approved
Järnström, L., Olsson, E., Menzel, C., Johansson, C., Koch, K. & Andersson, R. (2014). Cross-linked starch films for barrier coatings. In: : . Paper presented at Conference of 13th TAPPI Advanced Coating Fundamentals Symposium 2014 ; Conference Date: 7 October 2014 Through 9 October 2014 (pp. 134-148).
Open this publication in new window or tab >>Cross-linked starch films for barrier coatings
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2014 (English)Conference paper, Published paper (Refereed)
Keyword
Cross-linking, starch films, barrier coatings
National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-43171 (URN)2-s2.0-84942567664 (Scopus ID)978-151080129-5 (ISBN)
Conference
Conference of 13th TAPPI Advanced Coating Fundamentals Symposium 2014 ; Conference Date: 7 October 2014 Through 9 October 2014
Available from: 2016-06-30 Created: 2016-06-15 Last updated: 2016-06-30Bibliographically approved
Nyflött, Å., Axrup, L., Carlsson, G., Järnström, L., Lestelius, M. & Moons, E. (2014). Effects of dispersion barrier coating structure on oxygen barrier performance. In: : . Paper presented at Nordic Polymer Days, Gothenburg, 10-12 June 2014.
Open this publication in new window or tab >>Effects of dispersion barrier coating structure on oxygen barrier performance
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2014 (English)Conference paper, Oral presentation with published abstract (Other academic)
National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-34294 (URN)
Conference
Nordic Polymer Days, Gothenburg, 10-12 June 2014
Funder
Knowledge Foundation
Available from: 2014-10-13 Created: 2014-10-13 Last updated: 2017-11-06Bibliographically approved
Johansson, K., Kotkamo, S., Rotabakk, B. T., Johansson, C., Kuusipalo, J., Jönsson, L. J. & Järnström, L. (2014). Extruded polymer films for optimal enzyme-catalyzed oxygen scavenging. Chemical Engineering Science, 108, 1-8
Open this publication in new window or tab >>Extruded polymer films for optimal enzyme-catalyzed oxygen scavenging
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2014 (English)In: Chemical Engineering Science, ISSN 0009-2509, E-ISSN 1873-4405, Vol. 108, p. 1-8Article in journal (Refereed) Published
Abstract [en]

The use of enzymes as oxygen scavengers has a great potential in the food packaging industry. Enzymes can be incorporated into a coating layer that can be applied directly onto the packaging material. For the system to be fully functional, there is however a need for the packaging to have some barrier properties, to be sealable through heat, and to ensure low or no migration of the active coating to the food. Various combinations of the polypropylene (PP), poly(lactic acid) (PLA) and low density polyethylene (LDPE) were extruded onto board coated with the oxygen-scavenging enzyme. Properties such as oxygen-transmission rate, water-vapor transmission rate, heat-sealability, migration and oxygen scavenging capacity were evaluated. All combinations of extruded material resulted in a packaging material able to scavenge the oxygen at both 84% and 100% relative humidity. The greatest decrease in oxygen concentration of the head space of air-tight chambers was achieved with the material extruded with PLA on at least one side. It was found that the extruded plastic is necessary in order to meet the EU directives on migration from food packaging materials of not more than a total of 10 mg/dm2 material. All plastics were heat sealable against themselves but not against any of the other plastics and only LDPE adhered strongly to the enzyme-containing coating

Place, publisher, year, edition, pages
Amsterdam: Elsevier, 2014
Keyword
Oxygen scavenging, glucose oxidase, water vapor, migration, extrusion coating
National Category
Chemical Engineering Industrial Biotechnology
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-28460 (URN)10.1016/j.ces.2013.12.035 (DOI)000332392100001 ()
Available from: 2013-07-08 Created: 2013-07-08 Last updated: 2017-12-06Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-1256-1708

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