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Publications (10 of 260) Show all publications
Mesic, B., Cairns, M., Järnström, L., Le Guen, M. J. & Parr, R. (2019). Film formation and barrier performance of latex based coating: Impact of drying temperature in a flexographic process. Progress in organic coatings, 129, 43-51
Open this publication in new window or tab >>Film formation and barrier performance of latex based coating: Impact of drying temperature in a flexographic process
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2019 (English)In: Progress in organic coatings, ISSN 0300-9440, E-ISSN 1873-331X, Vol. 129, p. 43-51Article in journal (Refereed) Published
Abstract [en]

The post-application behaviour of aqueous dispersion barrier coatings is investigated. We have adapted a dispersion formulation initially optimised for rod coating, for application to linerboard by a flexographic press. The clay/talc/wax/poly(styrene-butadiene) latex dispersion coatings demonstrated a 60% reduction in water vapour transport rate across the barrier, and a 75% reduction in direct water uptake when the applied film was dried at 75 degrees C. Multi-layer coatings with a combined application rate of 7 g m(-2) exhibited Cobb(120) direct water uptake of 16.3 +/- 3.7g m(-2) (120s water contact duration) and a water vapour transport rate of 140 +/- 12g m(-2) d(-1) (23 degrees C, 50% RH). Investigation of the post-coating curing regime demonstrated a decrease in the prevalence of crack defects within the cured film, and corresponding improvement in barrier properties when higher drying temperatures were employed. Dynamic mechanical analysis of the cured films indicated improvements in homogeneity and a greater extent of intermolecular interactions in the coating formulations cured at elevated temperatures.

Place, publisher, year, edition, pages
Elsevier, 2019
Keywords
Barrier coating, Dispersion, Latex film formation, Flexography, WVTR, Cobb
National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-71725 (URN)10.1016/j.porgcoat.2018.12.025 (DOI)000460495800006 ()
Available from: 2019-04-05 Created: 2019-04-05 Last updated: 2019-04-10Bibliographically approved
Javed, A., Rättö, P., Järnström, L. & Ullsten, H. (2018). Crack analysis of barrier coatings based on starch and starch-PVOH with and without plasticizer. Nordic Pulp & Paper Research Journal, 33(2), 336-347
Open this publication in new window or tab >>Crack analysis of barrier coatings based on starch and starch-PVOH with and without plasticizer
2018 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 33, no 2, p. 336-347Article in journal (Refereed) Published
Place, publisher, year, edition, pages
Walter de Gruyter, 2018
Keywords
Starch, Glycerol, Barrier coatings, Mechanical properties, Creasing, Folding
National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-66849 (URN)10.1515/npprj-2018-3039 (DOI)000450922400018 ()
Available from: 2018-03-26 Created: 2018-03-26 Last updated: 2019-07-10Bibliographically approved
Javed, A., Rättö, P., Järnström, L. & Ullsten, H. (2018). Lignin-containing coatings for packaging materials. Nordic Pulp & Paper Research Journal, 33(3), 548-556
Open this publication in new window or tab >>Lignin-containing coatings for packaging materials
2018 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 33, no 3, p. 548-556Article in journal (Refereed) Published
Place, publisher, year, edition, pages
Walter de Gruyter, 2018
National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-66852 (URN)10.1515/npprj-2018-3042 (DOI)000450923900021 ()
Note

Artikeln ingick som manuskript i Javeds doktorsavhandling Effects of plasticizing and crosslinking on coatings based on blends of starch-PVOH and starch-lignin

Available from: 2018-03-26 Created: 2018-03-26 Last updated: 2019-07-10Bibliographically approved
Petkova-Olsson, Y., Oelschlaeger, C., Ullsten, H. & Järnström, L. (2018). Structural, microrheological and kinetic properties of a ternary silica-Pluronic F127-starch thermosensitive system. Journal of Colloid and Interface Science, 514, 459-467
Open this publication in new window or tab >>Structural, microrheological and kinetic properties of a ternary silica-Pluronic F127-starch thermosensitive system
2018 (English)In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 514, p. 459-467Article in journal (Refereed) Published
Abstract [en]

Hypothesis: The sol-gel transition in aqueous suspensions consisting of silica particles and thermosensitive polymer is controlled by inter-particle forces and solution properties of the polymer. Addition of a second non-thermosensitive polymer may affect the transition. The purpose of this work was to characterize the kinetics of the sol-gel transition and to understand the effects of a second non-thermosensitive polymer on the microstructure, using a combination of classical rheology and microrheology. Experiments: Classical rotational rheology as well as two microrheology methods, Multiple Particle Tracking (MPT) and Diffusing Wave Spectroscopy (DWS), were used to investigate the sol-gel transition of a ternary silica-Pluronic F127-starch thermosensitive system. Findings: Classical rheometry and DWS indicated sol-gel transition temperature similar to 25 degrees C at 1 wt% Pluronic, independently of the concentration of the other components. DWS showed a fast gelation process, less than two minutes for all samples, beside a second slow kinetic process. In the gel state, MPT indicated micro-structural and micro-viscoelastic differences compared to rotational rheology. This was explained by formation of an elastic matrix of silica and polymers in combination with assembly of silica particles in large macroporous agglomerates. Presence of starch led to breakdown of the macro porous network, leaving the homogeneous elastic network left.

Place, publisher, year, edition, pages
Academic Press, 2018
Keywords
Thermosensitive; Silica-pluronic-starch; Sol-gel transition; Kinetic; Microrheology; Microstructure
National Category
Chemical Sciences
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-66616 (URN)10.1016/j.jcis.2017.12.051 (DOI)000424963700050 ()29289030 (PubMedID)
Available from: 2018-03-08 Created: 2018-03-08 Last updated: 2019-07-10Bibliographically approved
Nyflött, Å., Petkova-Olsson, Y., Moons, E., Bonnerup, C., Järnström, L., Carlsson, G., . . . Minelli, M. (2017). Modelling of oxygen permeation through filled polymeric layers for barrier coatings. Journal of Applied Polymer Science, 134(20), Article ID 44834.
Open this publication in new window or tab >>Modelling of oxygen permeation through filled polymeric layers for barrier coatings
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2017 (English)In: Journal of Applied Polymer Science, ISSN 0021-8995, E-ISSN 1097-4628, Vol. 134, no 20, article id 44834Article in journal (Refereed) Published
Place, publisher, year, edition, pages
Wiley-Blackwell, 2017
National Category
Polymer Technologies
Research subject
Materials Science
Identifiers
urn:nbn:se:kau:diva-47461 (URN)10.1002/app.44834 (DOI)000395129600020 ()
Funder
Knowledge FoundationStora Enso
Available from: 2016-12-13 Created: 2016-12-07 Last updated: 2019-09-20Bibliographically approved
Christophliemk, H., Johansson, C., Ullsten, H. & Järnström, L. (2017). Oxygen and water vapor transmission rates of starch-poly(vinyl alcohol) barrier coatings for flexible packaging paper. Progress in organic coatings, 113, 218-224
Open this publication in new window or tab >>Oxygen and water vapor transmission rates of starch-poly(vinyl alcohol) barrier coatings for flexible packaging paper
2017 (English)In: Progress in organic coatings, ISSN 0300-9440, E-ISSN 1873-331X, Vol. 113, p. 218-224Article in journal (Refereed) Published
Abstract [en]

Creating efficient water-borne dispersions based mainly on renewable materials for coating of flexible packaging paper was the aim of this study. The effects of an ethylene modified poly(vinyl alcohol) grade and a standard poly(vinyl alcohol) on the oxygen and water vapor barrier performance of corn starch and potato starch coatings was studied. The results showed that a coating composition with a high fraction of a renewable polymer was effective in keeping the oxygen barrier at a technically and commercially applicable level. An ethylene modified poly(vinyl alcohol) grade was found to provide lower oxygen transmission rates at high relative humidity, as compared to a standard poly(vinyl alcohol) grade. The oxygen barrier properties of blends of starch and poly (vinyl alcohol) were similar to that of the pure modified poly(vinyl alcohol) in the range from 0% starch to 60% starch. This was observed with both hydroxypropylated and octenyl succinate modified starch grades. The drying conditions of the mixed starch:poly(vinyl alcohol) coatings were based on drying trials with pure poly (vinyl alcohol) coatings. Drying at moderate temperatures indicated the possibility to slightly decrease water vapor transmission rate by higher drying temperature. Several secondary effects of increased drying temperature such as coating hold-out and formation of defects may also be of importance.

Place, publisher, year, edition, pages
Elsevier, 2017
National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-65894 (URN)10.1016/j.porgcoat.2017.04.019 (DOI)000414114700024 ()
Funder
EU, FP7, Seventh Framework Programme
Available from: 2018-01-25 Created: 2018-01-25 Last updated: 2019-07-10Bibliographically approved
Lestelius, M., Nyflött, Å., Moons, E., Järnström, L., Carlsson, G., Bonnerup, C. & Govindarajan, V. (2017). Oxygen permeabilityand economic-environmental impact studies of some polyvinyl alcohol dispersionbarrier coatings for packaging applications. In: : . Paper presented at PTS Coating Symposium, September 5-6, Munich, Germany.
Open this publication in new window or tab >>Oxygen permeabilityand economic-environmental impact studies of some polyvinyl alcohol dispersionbarrier coatings for packaging applications
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2017 (English)Conference paper, Oral presentation only (Other academic)
Abstract [en]

Purposes of employing barrier coatings in packaging, and in particular food packaging, can be to increase the shelf life, preserve colour, odour, and taste, and to protect from a harmful environment in general. Barrier coatings can thus help to reduce food waste along the value chain until end use. Including both materials choice for packaging and the possible fates of the used package, even further steps to provide greater knowledge for decisions on choices of packaging solutions. To that end, we have conducted several experimental and transport modeling studies on oxygen barrier coatings performance. The coating system of choice    has been dispersion coatings of poly vinyl alcohol (PVOH), with additions of kaolin. Physical and chemical features of the coatings were characterized to obtain information on polymer crystallinity, free volume and filler orientation as these characteristics are influential to the oxygen mass transport performance. In turn, the oxygen mass transport was also measured, both in steady state and dynamically. In so doing, we obtained information    useful for developing a general model to describe the oxygen permeability taking into account the physical and chemical features, described above, of the coating layer. Attempts on describing the interdependence and impact, for instance between crystalline and amorphous polymer regions and moisture, was added to the model. The model showed agreement to experimental data for PVOH-kaolin coating in this particular case. However, the basic permeability model has been applied to  many different polymers.

To further explore the potential of these types of coating, which are technically possible to    produce in paperboard production, an economic-environmental impact comparison to other existing material solutions was made. Four barrier material alternatives – starch, polyethylene, ethyl vinyl alcohol (chosen as an alternative for PVOH, where data was difficult to obtain) and kaolin, and latex and kaolin, were analyzed with respect to cost and global warming potential. Weighting and comparing cost to environmental aspect, weighting    factors based on interviews with experts in the packaging value chain, starch emerges as the most sustainable alternative. However, previous coating and mass transport studies also shows how these renewable materials require some further technical development to be competitive.

The mass transport model can serve as a tool for customizing barrier coatings and to predict the barrier performance, as permeability is obtained and thus shelf-life estimation is    possible. The overall concept, the combination of assessment of structural performance and the environmental studies, can be employed to find sustainable food packaging solutions.

National Category
Paper, Pulp and Fiber Technology
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-63024 (URN)
Conference
PTS Coating Symposium, September 5-6, Munich, Germany
Projects
VIPP
Funder
Knowledge FoundationStora Enso
Available from: 2017-09-11 Created: 2017-09-11 Last updated: 2018-06-25Bibliographically approved
Christophliemk, H., Ullsten, H., Johansson, C. & Järnström, L. (2017). Starch-poly(vinyl alcohol) barrier coatings for flexible packaging paper and their effects of phase interactions. Progress in organic coatings, 111, 13-22
Open this publication in new window or tab >>Starch-poly(vinyl alcohol) barrier coatings for flexible packaging paper and their effects of phase interactions
2017 (English)In: Progress in organic coatings, ISSN 0300-9440, E-ISSN 1873-331X, Vol. 111, p. 13-22Article in journal (Refereed) Published
Abstract [en]

Starch and poly(vinyl alcohol) based barrier coatings for flexible packaging papers were studied. Both octenyl succinate modified and hydroxypropylated corn and potato starches were blended with regular and ethylene modified poly(vinyl alcohol) to increase the water vapor barrier properties and enhance the flexibility of the starch coatings, in order to accomplish superior barrier performance. Phase separation between starch and poly (vinyl alcohol) was studied in detail, both in the solution and in dry draw-down coatings on paper. The barrier performance of the coated paper was evaluated with respect to water vapor transmission rate. Conditions for the creation of a thin surface layer consisting of only one of the pure polymers were identified and discussed in terms of phase separation in solution migration of poly(vinyl alcohol) to the uppermost surface layer. The phase separation promoted low water vapor transmission rates also with a rather high fraction of starch in the coatings

Place, publisher, year, edition, pages
Elsevier, 2017
National Category
Polymer Chemistry Polymer Technologies Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:kau:diva-65723 (URN)10.1016/j.porgcoat.2017.04.018 (DOI)000407184600002 ()
Available from: 2018-01-18 Created: 2018-01-18 Last updated: 2019-07-10Bibliographically approved
Petkova-Olsson, Y., Altun, S., Ullsten, H. & Järnström, L. (2017). Temperature effect on the complex formation between Pluronic F127 and starch. Carbohydrate Polymers, 166, 264-270
Open this publication in new window or tab >>Temperature effect on the complex formation between Pluronic F127 and starch
2017 (English)In: Carbohydrate Polymers, ISSN 0144-8617, E-ISSN 1879-1344, Vol. 166, p. 264-270Article in journal (Refereed) Published
Abstract [en]

In this study a systematic investigation of the temperature effect on the interactions between Pluronic F127 and hydroxypropylated oxidised potato starch by surface tension titrations and quartz crystal microbalance (QCM) analysis is presented. The binary mixture examined was subjected to 20 degrees C and 30 degrees C and the results indicated no presence of binary complexes at the lower temperature. However, at elevated temperature, an ability for inclusion complex formation was detected by the here used independent techniques. The formed inclusion complexes at 30 degrees C are presumably a product of hydrophobic interaction between Pluronic F127 and starch, where starch acts as a host molecule and Pluronic F127 due to its increased hydrophobicity is the guest molecule in this complex. (C) 2017 Elsevier Ltd. All rights reserved.

Place, publisher, year, edition, pages
Elsevier, 2017
Keywords
Starch, Pluronic F127, Inclusion complex, Quartz crystal microbalance
National Category
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-65477 (URN)10.1016/j.carbpol.2017.02.012 (DOI)000400213300029 ()28385232 (PubMedID)
Available from: 2017-12-29 Created: 2017-12-29 Last updated: 2019-07-10Bibliographically approved
Nyflött, Å., Meriçer, Ç., Minelli, M., Moons, E., Jarnstrom, L., Lestelius, M. & Giacinti Baschetti, M. (2017). The influence of moisture content on the polymer structure of polyvinyl alcohol in dispersion barrier coatings and its effect on the mass transport of oxygen. JCT Research, 1345-1355
Open this publication in new window or tab >>The influence of moisture content on the polymer structure of polyvinyl alcohol in dispersion barrier coatings and its effect on the mass transport of oxygen
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2017 (English)In: JCT Research, ISSN 1547-0091, E-ISSN 2168-8028, p. 1345-1355Article in journal (Refereed) Published
Abstract [en]

This paper presents a study of the effect of moisture on the gas permeability of polyvinyl alcohol (PVOH) and PVOH–kaolin dispersion barrier coatings. The oxygen permeability was measured at different humidity levels, and the material properties were characterized under the same conditions: polymer crystallinity, kaolin concentration, and kaolin orientation were all evaluated. The experimental results revealed that the water plasticizes the PVOH material of the coatings, and the presence of kaolin filler is unable to affect such behavior significantly. The PVOH crystallinity was affected drastically by the humidity, as water melts polymer crystallites, which is a reversible process under removal of water. The permeability data were analyzed using a thermodynamicbased model able to account for the water effect on both the solubility of the gas and the diffusivity coefficients in the polymer and composite. The results showed good agreement between the model’s predictions and the experimental data in terms of the overall permeability of the material.

Place, publisher, year, edition, pages
Springer, 2017
Keywords
Mass transport, Permeability, Modeling, Barrier coating, Moisture, Kaolin, PVOH
National Category
Polymer Technologies
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-47462 (URN)10.1007/s11998-017-9937-2 (DOI)000422975500012 ()
Funder
Knowledge Foundation, 20100268Stora Enso
Available from: 2016-12-13 Created: 2016-12-07 Last updated: 2019-08-02Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-1256-1708

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