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Publications (10 of 14) Show all publications
Sjöstrand, B., Barbier, C., Ullsten, H. & Nilsson, L. (2019). Dewatering of Softwood Kraft Pulp with Additives of Microfibrillated Cellulose and Dialcohol Cellulose. BioResources, 14(3), 6370-6383
Open this publication in new window or tab >>Dewatering of Softwood Kraft Pulp with Additives of Microfibrillated Cellulose and Dialcohol Cellulose
2019 (English)In: BioResources, ISSN 1930-2126, E-ISSN 1930-2126, Vol. 14, no 3, p. 6370-6383Article in journal (Refereed) Published
Abstract [en]

The addition of nano-and micro-fibrillated cellulose to conventional softwood Kraft pulps can enhance the product performance by increasing the strength properties and enabling the use of less raw material for a given product performance. However, dewatering is a major problem when implementing these materials to conventional paper grades because of their high water retention capacity. This study investigated how vacuum dewatering is affected by different types of additives. The hypothesis was that different types of pulp additions behave differently during a process like vacuum suction, even when the different additions have the same water retention value. One reference pulp and three additives were used in a laboratory-scaled experimental study of high vacuum suction box dewatering. The results suggested that there was a linear relationship between the water retention value and how much water that could be removed with vacuum dewatering. However, the linear relationship was dependent upon the pulp type and the additives. Additions of micro-fibrillated cellulose and dialcohol cellulose to the stock led to dewatering behaviors that suggested their addition in existing full-scale production plants can be accomplished without a major redesign of the wire or high vacuum section.

Place, publisher, year, edition, pages
NORTH CAROLINA STATE UNIV DEPT WOOD & PAPER SCI, 2019
Keywords
Vacuum dewatering, Dewatering, Microfibrillated cellulose, Dialcohol cellulose, Papermaking, Strength additives, Retention aids, Drainage, Water retention value
National Category
Chemical Engineering
Research subject
Chemical Engineering; Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-74224 (URN)10.15376/biores.14.3.6370-6383 (DOI)000473204700100 ()
Available from: 2019-08-06 Created: 2019-08-06 Last updated: 2019-12-19Bibliographically 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
Kudahettige-Nilsson, R. L., Ullsten, H. & Henriksson, G. (2018). Plastic Composites Made from Glycerol, Citric Acid, and Forest Components. BioResources, 13(3), 6600-6612
Open this publication in new window or tab >>Plastic Composites Made from Glycerol, Citric Acid, and Forest Components
2018 (English)In: BioResources, ISSN 1930-2126, E-ISSN 1930-2126, Vol. 13, no 3, p. 6600-6612Article in journal (Refereed) Published
Abstract [en]

An ecofriendly approach for the synthesis of plastic biomaterials based on renewable materials suitable for 3D printing application or other applications has been developed. The material was prepared from native (microcrystalline) or amorphous cellulose, citric acid, and glycerol or ethylene glycol, by a pretreatment at 40 degrees C and a curing at 175 degrees C for 1 h. The results showed that tensile properties and the water absorption level of the material were acceptable. The highest strain at break (14%) was obtained from materials made of 10% amorphous cellulose with 90% glycerol/citric acid. It had a maximum stress at 37 MPa. Moreover, materials were without ash content. Possible applications of the material in 3D-printers were discussed. In addition, application of mechanical pulp and wood powder into novel plastic material production was discussed. Foaming during curing might be a problem for this type of material, but this can be avoided by using amorphous cellulose in the recipe.

Place, publisher, year, edition, pages
North Carolina State University, 2018
National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-69108 (URN)000440506300128 ()
Available from: 2018-09-07 Created: 2018-09-07 Last updated: 2019-12-20Bibliographically 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
Elsevier, 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: 2019-10-23Bibliographically approved
Hedenqvist, M., Johansson, E., Newson, W., Gallstedt, M., Kuktaite, R., Ullsten, H. & Ture, H. (2017). Extrusion of protein plastics. Paper presented at 253rd National Meeting of the American-Chemical-Society (ACS) on Advanced Materials, Technologies, Systems, and Processes, APR 02-06, 2017, San Francisco, CA. Abstract of Papers of the American Chemical Society, 253, Article ID 449.
Open this publication in new window or tab >>Extrusion of protein plastics
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2017 (English)In: Abstract of Papers of the American Chemical Society, ISSN 0065-7727, Vol. 253, article id 449Article in journal, Meeting abstract (Other academic) Published
Place, publisher, year, edition, pages
American Chemical Society (ACS), 2017
National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-69649 (URN)000430568503406 ()
Conference
253rd National Meeting of the American-Chemical-Society (ACS) on Advanced Materials, Technologies, Systems, and Processes, APR 02-06, 2017, San Francisco, CA
Available from: 2018-10-23 Created: 2018-10-23 Last updated: 2019-07-10Bibliographically 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
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: 2019-12-09Bibliographically approved
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, 30(8), 399-410
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 0894-3214, Vol. 30, no 8, p. 399-410Article 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)000406002100004 ()
Note

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Available from: 2015-11-06 Created: 2015-11-06 Last updated: 2019-12-09Bibliographically approved
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