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Publications (10 of 29) Show all publications
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
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.

Keywords
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
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.

Keywords
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
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
Nyflött, Å., Bonnerup, C., Carlsson, G., Järnström, L., Moons, E. & Lestelius, M. (2014). Modeling of oxygen diffusion in flake-filled polymer system. In: : . Paper presented at 8th ECNP international conference on Nanostructured polymers and nanocomposites, Dresden, 16-19 September 2014.
Open this publication in new window or tab >>Modeling of oxygen diffusion in flake-filled polymer system
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2014 (English)In: , 2014Conference paper, Oral presentation with published abstract (Other academic)
National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-34295 (URN)
Conference
8th ECNP international conference on Nanostructured polymers and nanocomposites, Dresden, 16-19 September 2014
Funder
Knowledge Foundation
Available from: 2014-10-13 Created: 2014-10-13 Last updated: 2017-11-06Bibliographically approved
Nyflött, Å., Moons, E., Bonnerup, C., Järnström, L., Gunilla, C. & Lestelius, M. (2014). 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
Carlsson, G., Axrup, L., Ljungqvist, C.-H. & Nyflott, A. (2013). The use of fluorescence microscopy and image analysis to characterize the porous structure in micro fibrillar cellulose gel - Part I: Brownian motion. Nordic Pulp & Paper Research Journal, 28(2), 190-197
Open this publication in new window or tab >>The use of fluorescence microscopy and image analysis to characterize the porous structure in micro fibrillar cellulose gel - Part I: Brownian motion
2013 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 28, no 2, p. 190-197Article in journal (Refereed) Published
Abstract [en]

The porous structure of a micro fibrilar cellulose, MFC, gel was studied by fluorescence microscopy and image analysis. The Brownian motion of fluorescent labelled carboxylated latex spheres, probes, was investigated at both high, 0.1-5 wt%, and low, 0-20 ppm, concentrations of MFC. The developed tracking program provides trajectories for probes. The trajectories can be studied according to either the individual approach or the ensemble approach to give complementary information regarding the fibrilar system. The Brownian motion can be used in the range 0 to 1.0 wt% MFC and the percentage of idle probes can be used when the concentrations exceeds 1.0 wt% MFC. The Brownian motion was found to be pH dependent both for the low and the high concentration regimes.

Place, publisher, year, edition, pages
Mittuniversitetet, 2013
Keywords
MFC, Micro fibrillar cellulose, Wet state conditions, Characterization, Tracking, Brownian motion, Fluorescence microscopy
National Category
Chemical Process Engineering
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-38670 (URN)10.3183/NPPRJ-2013-28-02-p190-197 (DOI)000321291900003 ()
Available from: 2015-11-23 Created: 2015-11-23 Last updated: 2017-12-01Bibliographically approved
Bohlin, M., Johannesson, I., Carlsson, G., Heegaard, N. H. & Blomberg, L. G. (2012). Estimation of the amount of β2-glycoprotein I adsorbed at the inner surface of fused silica capillaries after acidic, neutral and alkaline pretreatment. Electrophoresis, 33(12), 1695-1702
Open this publication in new window or tab >>Estimation of the amount of β2-glycoprotein I adsorbed at the inner surface of fused silica capillaries after acidic, neutral and alkaline pretreatment
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2012 (English)In: Electrophoresis, ISSN 0173-0835, E-ISSN 1522-2683, Vol. 33, no 12, p. 1695-1702Article in journal (Refereed) Published
Abstract [en]

Sample adsorption to the inner surface of fused silica capillaries is a common problem in

CE when analyzingmacromolecules and is harmful to the analysis. We previously utilized

the pH hysteresis effect of fused silica to facilitate electrophoresis of the strongly adsorbing

protein β2gpI in plain-fused silica capillaries at neutral pH. In the present paper, the

effect of different pretreatments of the capillary on the adsorption of the β2-glycoprotein

I has been investigated using electroosmosis markers, SDS mobilization, and imaging

based on indirect immunofluorescence microscopy for direct visualization. The amount

of β2gpI adsorbed on the surface was probed using all these independent techniques after

electrophoresis at neutral pH on capillaries pretreated with HCl, background electrolyte

(BGE), and NaOH. BGE pretreatment was included as a positive control. We found that

80% or more of the starting material was adsorbed to the inner surface of the silica

capillaries during electrophoresis after pretreatment with only BGE or with NaOH, but

after acidic pretreatment the loss was consistently less than 20%. NaOH most efficiently

removes adsorbed protein between runs. A theoretical calculation of the pH change of

the BGE showed that electrolysis affects the pH more than the deprotonation of silanols

during electrophoresis. We conclude that acidic pretreatment of fused silica capillaries

diminishes adsorption of β2gpI by decreasing charge-dependent wall adsorption.

 

Place, publisher, year, edition, pages
Weinheim, Germany: John Wiley & Sons, 2012
Keywords
Acidic pretreatment / Capillary electrophoresis / pH-hysteresis effect / Protein adsorption
National Category
Chemical Sciences
Research subject
Chemistry
Identifiers
urn:nbn:se:kau:diva-30939 (URN)10.1002/elps.201100592 (DOI)000305792500003 ()22674218 (PubMedID)
Available from: 2014-01-20 Created: 2014-01-20 Last updated: 2017-08-15Bibliographically approved
Carlsson, G., Rådberg, W., Ljungqvist, C.-H. & Axrup, L. (2011). A model system for understanding the distribution of fines in a paper structure using fluorescence microscopy. In: : . Paper presented at The 25th European Colloid and Interface Society Conference. Berlin, Germany, September 4-9, 2011.
Open this publication in new window or tab >>A model system for understanding the distribution of fines in a paper structure using fluorescence microscopy
2011 (English)Conference paper, Published paper (Refereed)
Abstract [en]

When making paper a sheet is formed by draining a specific amount of dilute water suspension of pulp and wet end additives through a wire-cloth. The procedure is well known but the underlying mechanisms are not fully understood. The pulp stock is composed by different particles such as fines, fibers, retention aids and other additives that interact with each other during the papermaking process. These interactions are important since they influence the properties of the formed paper. Pulp fibers have different sizes and the finest particle fraction is referred to as fines. In this study fines from bleached Kraft pulp were used.

The fines were oxidized to some extent as a consequence of the Kraft pulp process.A model system containing fibers and latex was used together with fluorescence microscopyand image analysis to study the Brownian motion of a probe in different electrolyte concentrations. The model system was built up of:

• A water suspension of 1 % fines, negatively charged. At this concentration the fines are interacting with each other, forming a gel like structure.

• Negatively charged probes with three different sizes (radii 50, 100 and 500 nm).

• Two types of electrolytes (NaCl and CaCl2). The electrolytes were used for altering the electrical double layer of the charged surfaces in the system.

By studying the Brownian motion of the probes with different sizes in the network of fines more can be understood about this model system. The knowledge obtained from this model system can be used for further understanding of the paper chemistry mechanisms.

References

Carlsson G., Warszynski P., van Stam J., J. Colloid Interface Sci., 2003, 267, 500-508

Carlsson G., van Stam J., Nord. Pulp Pap. Res. J., 2005, 20, 192-199

Carlsson G.,  Järnström L., van Stam J., J. Colloid Interface Sci., 2006, 298, 162-171

Rådberg W., Bachelor thesis, Karlstad University, 2010

Keywords
Fluorescence microscopy, diffusion coefficient, image analysis
National Category
Chemical Sciences
Research subject
Chemistry; Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-12327 (URN)
Conference
The 25th European Colloid and Interface Society Conference. Berlin, Germany, September 4-9, 2011
Available from: 2012-03-16 Created: 2012-03-16 Last updated: 2015-12-28Bibliographically approved
Carlsson, G., Ljungqvist, C.-H., Nyflött, Å. & Axrup, L. (2011). Characterization of Micro Fibrillated Cellulose using fluorescence microscopy: Evaluation of pretreatments of Micro Fibrillated Cellulose using fluorescence microscopy. Paper presented at Soft and hard materials, A symposium on surface and materials chemistry, Lund, Sweden, October 25-27, 2011..
Open this publication in new window or tab >>Characterization of Micro Fibrillated Cellulose using fluorescence microscopy: Evaluation of pretreatments of Micro Fibrillated Cellulose using fluorescence microscopy
2011 (English)Conference paper, Published paper (Refereed)
Abstract [en]

The paper making process is well known but the underlying mechanisms are not fully understood. Paper builds up from cellulose fibers and many additives are needed in the process. The interactions between components in the furnish are important. Pulp fibers have a wide size distribution and the finest particle fraction is called fines. The fines used in this study are Micro Fibrillated Cellulose (MFC) from bleached craft pulp.

 

A model system containing fibers and latex was used together with fluorescence microscopy and image analysis. By studying the motion of a labeled latex particle more can be understood about the internal structure of the system. The system consists of:

  • A water suspension of MFC. At the concentrations used the fines are interacting with each other, forming a gel like structure.
  • Negatively charged labeled latex particles (probes), with radius 0,1 µm.
  • Two types of electrolytes (NaCl and CaCl2). The electrolytes were used for altering the electrical double layer of the charged surfaces in the system.

Different pretreatments of the MFC has been investigated and evaluated using the movements of the probe in the network of fibers.

Keywords
Fluorescence microscopy, image analysis, diffusion coefficient
National Category
Chemical Sciences
Research subject
Chemistry; Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-12328 (URN)
Conference
Soft and hard materials, A symposium on surface and materials chemistry, Lund, Sweden, October 25-27, 2011.
Available from: 2012-03-16 Created: 2012-03-16 Last updated: 2014-09-10Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0001-7235-0905

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