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Publications (10 of 22) Show all publications
Sjöstrand, B., Nilsson, L. & Barbier, C. (2017). Modeling of forming fabric structure influence on vacuum box dewatering. TAPPI Journal (8), 477
Open this publication in new window or tab >>Modeling of forming fabric structure influence on vacuum box dewatering
2017 (English)In: TAPPI Journal, ISSN 0734-1415, no 8, p. 477-Article in journal (Refereed) Published
National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-47598 (URN)000413824000005 ()
Available from: 2017-01-09 Created: 2017-01-09 Last updated: 2019-03-06Bibliographically approved
Hämäläinen, P., Hallbäck, N. & Barbier, C. (2016). Development and evaluation of a high-speed creping simulator for tissue. Nordic Pulp & Paper Research Journal, 31(3), 448-458
Open this publication in new window or tab >>Development and evaluation of a high-speed creping simulator for tissue
2016 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 31, no 3, p. 448-458Article in journal (Refereed) Published
Abstract [en]

An innovative creping simulator for tissue has been developed to meet the requirements set by both industrial needs, such as speed and process step duration, and research ambitions, such as flexibility for modifications and efficient operation. Some of these factors can be difficult to achieve with the previously introduced simulators. Lower speeds and much longer process step times can jeopardize results when, for instance, the drying time of chemicals is longer and the speed of creping is slower than in a tissue mill. The newly developed simulator has been used to investigate the effects of paper grammage, creping angle, temperature of dryer, speed and the horizontal force experienced during tissue creping. Results show good agreement with results of industrial-scale tissue production, with the exception of shrinkage which was greater. It was observed that the grammage influences the final thickness and the shrinkage of creped sheets, and that creping speed affects the creping frequency, thickness and shrinkage. The temperature of the surface of a sled mimicking the Yankee cylinder was shown to influence creping frequency and thickness. The horizontal friction force during creping appears to increase if drying temperature is lowered.

Place, publisher, year, edition, pages
AB SVENSK PAPPERSTIDNING, 2016
Keywords
Creping, Test methods, Tissue, Adhesives, Low weight papers, Adhesion, Yankee dryer
National Category
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-65094 (URN)000387976000005 ()
Available from: 2017-11-02 Created: 2017-11-02 Last updated: 2019-12-10Bibliographically approved
Sjöstrand, B., Barbier, C. & Nilsson, L. (2016). Influence on sheet dewatering by structural differences in forming fabrics. In: Paper Conference and Trade Show (PaperCon 2016); Vol. 2: Proceedings of a meeting held 15-18 May 2016, Cincinnati, Ohio, USA.. Paper presented at Paper Conference and Trade Show (PaperCon 2016), 15-18 May 2016, Cincinnati, Ohio, USA. (pp. 767-776). Peachtree Corners, Georgia: TAPPI Press
Open this publication in new window or tab >>Influence on sheet dewatering by structural differences in forming fabrics
2016 (English)In: Paper Conference and Trade Show (PaperCon 2016); Vol. 2: Proceedings of a meeting held 15-18 May 2016, Cincinnati, Ohio, USA., Peachtree Corners, Georgia: TAPPI Press, 2016, p. 767-776Conference paper, Published paper (Refereed)
Abstract [en]

Forming fabrics for paper manufacturing are designed with great care to enhance both process and products and are accountable for a lot of the performance of paper machines in the forming section, both with regards to energy and quality aspects. Different approaches to the design of the weave pattern and the choice of yarn materials and diameters have given the market different fabric structures. Fabric parameters that have been shown to cause differences in dewatering are caliper, void volume and permeability. To understand how the structure of the forming fabrics affects sheet dewatering selected fabrics have been tested experimentally, with dewatering equipment that simulates vacuum dewatering.

Dryness of the paper sheet was determined after dewatering and the air volume sucked through sheet and fabric was calculated. The fabrics that were chosen had similar values for all the known parameters previously shown to affect dewatering but had different structures that are defined by the open area (%) in the paper side and the wear side. Tests were performed with three fabric structures and 80 g/m2 softwood sheets. The sheets were made of both unbeaten and highly beaten pulp, and two vacuum levels were used during trials.

The results show that the fabric structure influences the sheet dewatering rate even if the caliper, void volume and permeability are the same. The air volume sucked through the structure of sheet and wire during the dewatering increased linearly with dwell time indicating that a constant air volume was reached. No significant differences were observed between the different fabrics in terms of the air volume at steady state. The conclusions are that the structure of forming fabrics affects the dewatering rate at certain conditions even with constant air volume and outgoing dryness. This is believed to be connected to (i) the fibers’ penetration of the fabric’s surface during the dewatering process or to (ii) the different resistances to in-plane and thickness- direction flow of the fabrics or to a combination of (i) and (ii). Studies of surface topography are used to explain the phenomenon and numerical simulations will be made in a later study to further evaluate this. 

Place, publisher, year, edition, pages
Peachtree Corners, Georgia: TAPPI Press, 2016
National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-47597 (URN)9781510831193 (ISBN)
Conference
Paper Conference and Trade Show (PaperCon 2016), 15-18 May 2016, Cincinnati, Ohio, USA.
Available from: 2017-01-09 Created: 2017-01-09 Last updated: 2019-05-23Bibliographically approved
Sjöstrand, B., Barbier, C. & Nilsson, L. (2015). Rewetting after high vacuum suction boxes in a pilot paper machine. Nordic Pulp & Paper Research Journal, 30(4), 667-672
Open this publication in new window or tab >>Rewetting after high vacuum suction boxes in a pilot paper machine
2015 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 30, no 4, p. 667-672Article in journal (Refereed) Published
Abstract [en]

Increased energy efficiency is a major concern for all companies today. Not only does the cost efficiency follow energy efficiency but also environmental and sustainability aspects motivate more energy efficient production lines. A study has been made on a pilot paper machine with the purpose to show the magnitude and time of rewetting after high vacuum suction box dewatering. The grammages used in this study were 20 and 100 g/m2 to cover both tissue and printing paper grades. Machine speed was varied from 400 to 1600 m/min and the maximum pressure drop in the suction box was 32 kPa. The pulp used was unbeaten, chemical, fully bleached softwood from Sweden. Rewetting is observed when the dewatering in the suction box is sufficiently high. No rewetting takes place when the dewatering in the suction box is limited due to insufficient pressure drop and dwell time. The time for the rewetting is in the range of 10-50 ms and in this study the maximum rewetting observed is 180 g/m2, or 6.1% decrease in dryness. The mechanisms behind the phenomenon are believed to be capillary forces caused by sufficiently low sheet moisture and expansion of the network. This study shows that rewetting is so fast that it would be difficult to prevent it without changing major machine parameters.

Place, publisher, year, edition, pages
AB SVENSK PAPPERSTIDNING, Sweden, 2015
Keywords
Energy efficiency, Forming fabric, High vacuum, Paper forming, Pilot study, Rewetting, Suction box dewatering
National Category
Paper, Pulp and Fiber Technology
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-46408 (URN)10.3183/NPPRJ-2015-30-04-p667-672 (DOI)000366040300015 ()
Available from: 2016-10-06 Created: 2016-10-06 Last updated: 2019-09-19Bibliographically approved
Hallbäck, N., Korin, C., Barbier, C. & Nygårds, M. (2014). Finite Element Analysis of Hot Melt Adhesive Joints in Carton Board. Packaging technology & science, 27(9), 701-712
Open this publication in new window or tab >>Finite Element Analysis of Hot Melt Adhesive Joints in Carton Board
2014 (English)In: Packaging technology & science, ISSN 0894-3214, E-ISSN 1099-1522, Vol. 27, no 9, p. 701-712Article in journal (Refereed) Published
Place, publisher, year, edition, pages
Wiley Online Library, 2014
National Category
Engineering and Technology Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:kau:diva-33788 (URN)10.1002/pts.2060 (DOI)000341142400003 ()
Available from: 2014-09-22 Created: 2014-09-22 Last updated: 2017-12-05Bibliographically approved
Boudreau, J. & Barbier, C. (2014). Laboratory creping equipment. Journal of Adhesion Science and Technology, 28(6), 561-572
Open this publication in new window or tab >>Laboratory creping equipment
2014 (English)In: Journal of Adhesion Science and Technology, ISSN 0169-4243, E-ISSN 1568-5616, Vol. 28, no 6, p. 561-572Article in journal (Refereed) Published
Abstract [en]

Tissue production is largely dependent on the creping process as creping influences the paper properties and thus the quality of the end product and the runnability of the tissue machine. The process is very complex and includes numerous variables affecting the adhesion, and ultimately the creping of the tissue paper. To perform experiments on a full scale machine, or even a pilot machine, is very costly, therefore a laboratory scale creping device is demanded, able to replicate conditions encountered on a tissue machine. In this paper new laboratory testing equipment is developed, whereby the adhesion between paper and metal surfaces (when scraping off the paper with configurations similar to the industrial process) can be studied. A new method to adhere paper to metal, used in the new laboratory creping equipment, is also developed. To evaluate the equipment, different creping angles were tested. The scraping tests show a trend in decreasing creping force for an increasing creping angle.

Place, publisher, year, edition, pages
Taylor & Francis, 2014
Keywords
adhesion, tissue paper, creping, testing, Yankee
National Category
Engineering and Technology Chemical Engineering
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-29920 (URN)10.1080/01694243.2013.849843 (DOI)000328728200003 ()
Available from: 2013-10-30 Created: 2013-10-29 Last updated: 2017-12-06Bibliographically approved
Barbier, C., Rättö, P. & Hornatowska, J. (2012). Coating models for an analysis of cracking behavior between folded paper and creased board. Paper presented at 12th TAPPI advanced coating fundamentals symposium proceedings, September 10-12, 2012, Atlanta, GA, USA.
Open this publication in new window or tab >>Coating models for an analysis of cracking behavior between folded paper and creased board
2012 (English)Conference paper, Oral presentation only (Refereed)
Abstract [en]

Creasing coated carton board or folding coated magazine paper, result in large strains in the surface layer of the paper product and might result in surface cracks, which decrease the quality of the products. A better understanding of the mechanical properties of coated layers increases the knowledge needed to reduce crack formation in coated fiberbased materials.The crack area on a coated board was measured after creasing and folding and the crack area on a coated copy paper was measured after folding. A clay pigment and a Ground Calcium Carbonate (GCC) pigment were used. The binder was either an S/B latex or an S/B latex combined with starch.

Keywords
Anisotropy, clay, coating, cracking, creasing, folding, GCC, mechanical properties, shear properties
National Category
Paper, Pulp and Fiber Technology
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-15693 (URN)978-1-59510-220-1 (ISBN)
Conference
12th TAPPI advanced coating fundamentals symposium proceedings, September 10-12, 2012, Atlanta, GA, USA
Available from: 2012-11-20 Created: 2012-11-20 Last updated: 2014-10-28Bibliographically approved
Kullander, J., Nilsson, L. & Barbier, C. (2012). Evaluation of furnishes for tissue manufacturing; suction box dewatering and paper testing. Nordic Pulp & Paper Research Journal, 27(1), 143-150
Open this publication in new window or tab >>Evaluation of furnishes for tissue manufacturing; suction box dewatering and paper testing
2012 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 27, no 1, p. 143-150Article in journal (Refereed) Published
Abstract [en]

Water removal on a tissue machine becomes progressively more difficult and expensive in each successive zone. A good way to reduce cost can therefore be to improve the dewatering prior to evaporative drying. This can be done by selecting proper raw materials and optimizing the treatment of the fibres in the furnish.

In this work, four pulps beaten to different levels were studied in vacuum dewatering trials. Mixing of the pulps, common in tissue manufacturing, was also performed. To simulate the suction boxes on a tissue machine, bench-scale laboratory equipment was used. Conditions typically used on a tissue machine regarding dwell times and vacuum levels were chosen. Paper properties relevant for tissue, like wet strength and absorption were measured on non-creped papers. To obtain information about the fibre properties, fibre characterization and microscope studies were also conducted.

Vacuum dewatering in tissue manufacturing is shown to be affected by the choice of pulp which can be explained by structural differences in the networks caused by variations in fibre properties. Beating has a strong negative impact on the solids contents reached, which is believed to be an effect of both internal and external fibrillation. These results, together with additional data from mixing and paper testing, give a better understanding of how the furnish should be prepared to reduce energy use in the process and still fulfil consumer requirements on properties.

Place, publisher, year, edition, pages
Stockholm: Nordic pulp and paper, 2012
Keywords
Beating, Fibre properties, Mixing, Solids content, Suction box dewatering, Tissue, Water removal
National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-14541 (URN)10.3183/NPPRJ-2012-27-01-p143-150 (DOI)000311019900017 ()
Available from: 2012-08-21 Created: 2012-08-21 Last updated: 2017-12-07Bibliographically approved
Kullander, J., Nilsson, L. & Barbier, C. (2012). Evaluation of furnishes for tissue manufacturing: wet pressing. Nordic Pulp & Paper Research Journal, 27(5), 947-951
Open this publication in new window or tab >>Evaluation of furnishes for tissue manufacturing: wet pressing
2012 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 27, no 5, p. 947-951Article in journal (Refereed) Published
Abstract [en]

Wet pressing is the last operation on the tissue machine in which water can be removed prior to the expensive evaporative drying of the web. An increase in dryness at this stage can lead to major savings during the manufacturing process. A higher solids content can be achieved by suitable selection of raw materials and by optimizing the treatment of the fibres in the furnish. In this work, wet pressing was evaluated with four pulps beaten to different levels in a PFI mill. Wet pressing was done in a dynamic press simulator and conditions representative of tissue machines with regard to nip pressures and dwell times were chosen. Water retention and thermoporometry were used to determine the pore structure of the fibres. Thickness measurements were made to determine the permanent deformation of the sheets after the pressure pulse.

Wet pressing in tissue manufacturing is shown to be affected by the choice of pulp, which can be explained by differences in pore structure of the fibres and consequently differences in ability to retain water. More water available before pressing leads to more water that can be removed. Beating has a negative impact on the solids contents reached after pressing, which is believed to be an effect of both internal and external fibrillation. These effects of beating seem mainly to affect the dryness after vacuum dewatering, which is also reflected after pressing. Beating delaminates macropores in the fibre wall but has a minor effect on micropores. Both water between the fibres and water in macropores are removed during pressing. These results give knowledge of how the furnish should be prepared in order to reduce energy consumption in the process.

Place, publisher, year, edition, pages
Mittuniversitetet, 2012
Keywords
Beating, Pore structure, Solids content, Thermoporosimetry, Tissue, Water removal, Water retention value, Wet pressing
National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-14542 (URN)10.3183/NPPRJ-2012-27-05-p947-951 (DOI)000313375400015 ()
Available from: 2012-08-21 Created: 2012-08-21 Last updated: 2019-06-17Bibliographically approved
Rättö, P., Hornatowska, J. & Barbier, C. (2012). Influence of the distribution of the shape and size distribution of pigment particles on cracking in coating layers during creasing. Nordic Pulp & Paper Research Journal, 27(4), 714-720
Open this publication in new window or tab >>Influence of the distribution of the shape and size distribution of pigment particles on cracking in coating layers during creasing
2012 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 27, no 4, p. 714-720Article in journal (Refereed) Published
Abstract [en]

The crack area on a coated board was measured after creasing and folding and the crack area on a coated copy paper was measured after folding. A clay pigment and two Ground Calcium Carbonate (GCC) pigments were used. The GCC pigments differed in their particle size distribution. The binder was either an S/B latex or an S/B latex combined with starch. The type of pigment seemed to have the greatest influence on the crack area in creased and folded board. Clay showed a larger crack area than the GCC with a broad particle size distribution. The GCC with a narrow particle size distribution showed a considerably larger crack area than both the clay pigment and the GCC with a broad particle size distribution. The coatings containing starch generally showed a larger crack area than the coatings that only contained the S/B latex. After the folding of the copy paper, the crack area showed a slightly different pattern. Here, it seemed that the binder was of greater importance than the type of pigment, with the coatings containing only latex showing a considerably lower crack area than the coatings containing starch. The coatings that were based on the clay pigment showed similar values as the coatings based on the GCC pigment with the broad particle size distribution. The coatings based on the GCC with the narrow particle size distribution showed displayed considerably higher crack areas than the coatings based on the other two pigments. The cracking tendency of the coatings, based on the GCC with the narrow particle size distributions was probably due to a greater demand for latex, i.e. smaller particles in the GCC with broad particle size distribution would probably fill in the voids and the GCC with the broad particle size distribution will therefore demand less binder. It was further suggested that the different loadings on the coating layer during the creasing and folding of the board, compared to the folding of copy paper, explain the different results obtained with the two base-substrates. 

Place, publisher, year, edition, pages
Stockholm: , 2012
Keywords
Clay, Coating, Cracking, Creasing, Folding, GCC, Latex, Particle size distribution, Starch
National Category
Paper, Pulp and Fiber Technology
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-15692 (URN)10.3183/NPPRJ-2012-27-04-p714-720 (DOI)000315063800006 ()
Available from: 2012-11-20 Created: 2012-11-20 Last updated: 2017-12-07Bibliographically approved
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Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0001-9545-7836

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