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Barrier properties and heat sealability/failure mechanisms of dispersion coated paperboard
YKI – Ytkemiska institutet.
2002 (English)In: Packaging technology & science, ISSN 0894-3214, E-ISSN 1099-1522, Vol. 15, 209-224 p.Article in journal (Refereed)
Abstract [en]

Plate-like fillers are often added to improve barrier properties and to prevent blocking of dispersion coatings on paper and board. We have studied the effects of clay addition, neutralizing agent and drying conditions on water vapour permeability, water absorption, oxygen permeability and heat sealability of carboxylated styrene/butyl acrylate dispersion coatings on a pilot scale. The barrier dispersions were applied on a pre-coated side of a three-ply board, using a pre-metering roll coater. Coated strips were sealed under specified conditions of temperature, time and pressure and the sealability was assessed by measuring the peak load necessary to break the joints. The surface composition of the barrier-coated board was analysed and the mode of failure was characterized by ESCA. The occurrence of pinholes in the barrier coatings was assessed by both staining tests and ESEM/EDX analysis of the surface topography. The resulting barrier properties were satisfactory as far as resistance to water transport in both liquid and vapour form is concerned. The oxygen permeability was similar to that of similar amorphous polymers. Heat-sealing tests showed that the mode of failure was mainly cohesive in nature, as fibre tear occurred when sealed strips were separated. Neutralization with sodium hydroxide gave poor adhesion and had a negative effect on the seal strength. Barrier measurements and ESEM/EDX analysis both showed that the pinholes present extended only through the barrier coating

Place, publisher, year, edition, pages
2002. Vol. 15, 209-224 p.
Keyword [en]
Barrier coating, carboxylated styrene/butyl acrylate latex, clay, WVTR, Cobb, heat sealability
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-27362OAI: oai:DiVA.org:ri-27362DiVA: diva2:1054366
Note
A1553Available from: 2016-12-08 Created: 2016-12-08Bibliographically approved

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