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Crack analysis of barrier coatings based on starch and starch-PVOH with and without plasticizer
Karlstad University, Sweden.
RISE - Research Institutes of Sweden, Bioeconomy, Papermaking and Packaging. Karlstad University, Sweden.ORCID iD: 0000-0003-0783-4959
Karlstad University, Sweden.
Karlstad University, Sweden.
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
Abstract [en]

Barrier coatings based on starch and starch-PVOH plasticized with glycerol and without plasticizer were applied to two different paperboard substrates, a triple coated board and duplex board, in order to investigate the tendency for cracks to develop in the barrier coating layers during creasing and folding. Tensile properties of films based on the starch and starch-PVOH blend were determined to investigate the relationship between the flexibility of the films and the cracking in the barrier coating layers. Furthermore, the oxygen transmission rate through the barrier-coated paperboard was measured before and after creasing and folding. The oxygen transmission rate through the barrier-coated samples was over the measurable range i. e. OTR > 10000 cm 3 / m 2 day\text{OTR}>10000\hspace{0.1667em}{\text{cm}}^{3}/{\text{m}}^{2}\hspace{0.1667em}\text{day} after creasing and folding, which indicated failure in the barrier coating layers. Optical microscopy revealed small cracks in the barrier coating layers, probably related to an increase in flexibility of the barrier coating layers. It was observed in scanning electron micrographs that cracks in the barrier coating layers seemed to follow the fibers when the barrier coating was applied on the rear side of the duplex board. Scanning electron micrographs and surface profiler images revealed that cracks in the barrier coating layers might have originated from the mineral coating layer when the starch and starch/PVOH coating layers were applied on the mineral-coated side of the triple coated board. An increase in the thickness of the barrier coating layer did not seem to increase the resistance to failure.

Place, publisher, year, edition, pages
2018. Vol. 33, no 2, p. 336-347
Keywords [en]
barrier coatings, creasing, folding, glycerol, mechanical properties, starch, Cracks, Nanofiltration membranes, Oxygen, Oxygen permeable membranes, Paperboards, Plasticizers, Reinforced plastics, Scanning electron microscopy, Coated paperboard, Crack analysis, Oxygen transmission rates, Scanning electron micrographs, Surface profilers, Coatings, Vapor Barriers
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-34432DOI: 10.1515/npprj-2018-3039Scopus ID: 2-s2.0-85049145359OAI: oai:DiVA.org:ri-34432DiVA, id: diva2:1237191
Note

 Funding details: 20100268, Knowledge Foundation; Funding text: Funding: This work was performed as part of the multidisciplinary Industrial Graduate School VIPP (Value Created in Fibre-based Processes and Products at Karlstad University and was supported by grants from the Knowledge Foundation (Sweden), grant registration number 20100268.

Available from: 2018-08-07 Created: 2018-08-07 Last updated: 2018-08-15Bibliographically approved

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Rättö, Peter

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