Change search
Link to record
Permanent link

Direct link
BETA
Engström, Gunnar
Publications (10 of 32) Show all publications
Ragnarsson, M., Engström, G. & Järnström, L. (2013). Porosity Variations in Coating Layers - Impact on Back-trap Mottle. Nordic Pulp & Paper Research Journal, 28(2), 257-263
Open this publication in new window or tab >>Porosity Variations in Coating Layers - Impact on Back-trap Mottle
2013 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 28, no 2, p. 257-263Article in journal (Other academic) Published
Abstract [en]

A pilot coating trial was performed to study 1) whether the drying strategy introduces porosity variations in the coating layer and 2) whether porosity variations caused by the subsequent supercalendering are linked to back-trap mottle in offset prints. The porosity variations and the mean porosity were indirectly measured using a burn-out test. Coating colours were compared with three different binder systems 1) carboxy methyl cellulose (CMC)/SB-latex, 2) dextrin/SB-latex and 3) oxidized starch/SB-latex. The results showed that neither the mean porosity nor the porosity variations were affected by the drying strategies studied. During calendering the coating with the CMC/SB-latex binder system was compressed the most, but the porosity variations were nevertheless small. Both the compression and the porosity variations were influenced by the drying strategy, which shows that the strategy had an impact on the mechanical properties of the dry coating layer. With CMC/SB-latex and dextrin/SB-latex, the mottle increased when the porosity variations introduced by the calendering increased. In the case of the oxidized starch/SB-latex, the opposite was true. It was concluded that with CMC/SB-latex and dextrin/SB-latex, print mottle is caused by calendering and with oxidized starch/SB-latex by non-uniformities introduced during dewatering and drying, possibly binder migration.

Place, publisher, year, edition, pages
Sundsvall: Mid Sweden University, 2013
Keywords
coated papers, porosity variations, binders, back trap mottle
National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-14407 (URN)000321291900010 ()
Note

Part of the thesis: Variations Related to Print Mottle in Starch-Containing Paper Coatings, http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-14409

Available from: 2012-07-30 Created: 2012-07-30 Last updated: 2018-06-27Bibliographically approved
Kjellgren, H. & Engström, G. (2008). Influence of paper structure on barrier properties of starch-coated greaseproof paper. Nordic Pulp & Paper Research Journal, 23(1), 87-90
Open this publication in new window or tab >>Influence of paper structure on barrier properties of starch-coated greaseproof paper
2008 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 23, no 1, p. 87-90Article in journal (Refereed) Published
National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-1932 (URN)10.3183/NPPRJ-2008-23-01-p087-090 (DOI)
Available from: 2007-11-09 Created: 2007-11-09 Last updated: 2017-12-07Bibliographically approved
Kjellgren, H. & Engström, G. (2008). Oxygen permeability of polyethylene-extrusion-coated greaseproof paper. Nordic Pulp & Paper Research Journal, 23(3), 272-276
Open this publication in new window or tab >>Oxygen permeability of polyethylene-extrusion-coated greaseproof paper
2008 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 23, no 3, p. 272-276Article in journal (Refereed) Published
Abstract [en]

Polyethylene-extrusion-coated greaseproof paper exhibited significantly lower oxygen permeability than predicted from the oxygen permeability of polyethylene and greaseproof paper itself. Two mechanisms proposed for the superior oxygen permeability of polyethylene-extrusion-coated greaseproof paper were compared. 

National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-1933 (URN)10.3183/NPPRJ-2008-23-03-p272-276 (DOI)
Available from: 2007-11-09 Created: 2007-11-09 Last updated: 2017-12-07Bibliographically approved
Mesic, B., Engström, G. & Lestelius, M. (2008). Water-Borne and Solvent-Based Flexographic Inks Influence on Uncovered Area and Ink Leveling on PEcoated Paperboard. TAGA Journal Vol 4 2008
Open this publication in new window or tab >>Water-Borne and Solvent-Based Flexographic Inks Influence on Uncovered Area and Ink Leveling on PEcoated Paperboard
2008 (English)In: TAGA Journal Vol 4 2008Article in journal (Refereed)
National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-25688 (URN)
Available from: 2013-01-22 Created: 2013-01-22 Last updated: 2013-01-22
Larsson, M., Vidal, D., Zou, X. & Engström, G. (2007). Impact of calendering on coating structures. NORDIC PULP AND PAPER RESEARCH JOURNAL 22(2): 267-274
Open this publication in new window or tab >>Impact of calendering on coating structures
2007 (English)In: NORDIC PULP AND PAPER RESEARCH JOURNAL 22(2): 267-274Article in journal (Refereed)
National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-20195 (URN)
Available from: 2013-01-21 Created: 2013-01-21 Last updated: 2013-01-21
Larsson, M., Vidal, D., Zou, X. & Engström, G. (2007). Paper coating properties as affected by pigment blendning and calendering study. TAPPI JOURNAL 6(8): 16-22
Open this publication in new window or tab >>Paper coating properties as affected by pigment blendning and calendering study
2007 (English)In: TAPPI JOURNAL 6(8): 16-22Article in journal (Refereed)
National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-22232 (URN)
Available from: 2013-01-21 Created: 2013-01-21 Last updated: 2013-01-21
Kjellgren, H., Gällstedt, M., Engström, G. & Järnström, L. (2006). Barrier and Surface Properties of Chitosan-Coated Greaseproof Paper. Carbohydrate Polymers, 65(4) 453-460 (2006)
Open this publication in new window or tab >>Barrier and Surface Properties of Chitosan-Coated Greaseproof Paper
2006 (English)In: Carbohydrate Polymers, 65(4) 453-460 (2006)Article in journal (Refereed)
Keywords
Greaseproof papers, Air permeance, Coatings, Chitosan, Oxygen Barrier properties
National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-17294 (URN)
Projects
Barrier coatings for greaseproof paper
Available from: 2013-01-21 Created: 2013-01-21 Last updated: 2013-01-21
Mesic, B., Lestelius, M. & Engström, G. (2006). Convertability Effects on Printability of Low-Density Polyethylene-Coated Packaging Material. Paper presented at Proc. For Printing Technology SPb´06 P, Saint Petersburg, Russia. Paper presented at Proc. For Printing Technology SPb´06 P, Saint Petersburg, Russia.
Open this publication in new window or tab >>Convertability Effects on Printability of Low-Density Polyethylene-Coated Packaging Material
2006 (English)Conference paper, Published paper (Refereed)
National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-17874 (URN)
Conference
Proc. For Printing Technology SPb´06 P, Saint Petersburg, Russia
Available from: 2013-01-21 Created: 2013-01-21 Last updated: 2013-01-21
Kjellgren, H. & Engström, G. (2006). Influence of base paper on the barrier properties of chitosan-coated papers. Nordic Pulp and Paper Research Journal 21 (5) pp 685-689
Open this publication in new window or tab >>Influence of base paper on the barrier properties of chitosan-coated papers
2006 (English)In: Nordic Pulp and Paper Research Journal 21 (5) pp 685-689Article in journal (Refereed)
Abstract [en]

A kraft paper and three greaseproof papers with different porosities were coated with chitosan to see whether the cheaper kraft paper can be used as a base paper for this coating and whether the final coated paper meets the demand for a low oxygen transmission rate. The coating was performed on a bench scale and two coat weights were applied: 3.4 and 6.0 g/m2. Besides the oxygen transmission rate, the coated material was also tested with respect to air permeance, grease resistance and water vapour transmission rate. The results showed that the coated kraft papers did not meet the demand for a low oxygen transmission rate. A lower oxygen transmission rate was obtained on the greaseproof paper with the lowest porosity, where the coating stayed on the surface and formed a continuous film without cracks. The chitosan coating gave a high grease resistance on the two densest greaseproof papers. Chitosan provided no barrier against water vapour transmission

National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-20310 (URN)
Available from: 2013-01-21 Created: 2013-01-21 Last updated: 2013-01-21
Mesic, B., Lestelius, M. & Engström, G. (2006). Influence of corona treatment decay on print quality in water-born flexographic printing of Low-Density Polyethylene-coated paperboard. Packaging Technology and Science, 19(2), 61-70 (2006)
Open this publication in new window or tab >>Influence of corona treatment decay on print quality in water-born flexographic printing of Low-Density Polyethylene-coated paperboard
2006 (English)In: Packaging Technology and Science, 19(2), 61-70 (2006)Article in journal (Refereed)
Keywords
surface energy, spreading, printability, water-borne flexography, low-density polyethylene-coated paperboard, LDPE-coated paperboard corona treatment, print density, dot gain, uncovered areas, mottling, contact angle
National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-20314 (URN)
Projects
Flexographic printing of PE-coated paperboard
Available from: 2013-01-21 Created: 2013-01-21 Last updated: 2013-01-21
Organisations

Search in DiVA

Show all publications