A1 Journal article (refereed), original research

Inkjet Printability and Functional Properties of Synthetic Silicate-Filled Hydroxypropylated Starch-based Dispersion Coatings


Publication Details
Authors: Mielonen Katriina, Ovaska Sami-Seppo, Koivula Hanna M., Jalkanen Laura, Backfolk Kaj
Publisher: Is&t Society for Imaging Science and
Publication year: 2017
Language: English
Related Journal or Series Information: Journal of Imaging Science and Technology
Volume number: 61
Issue number: 5
Start page: 050502-1
End page: 050502-10
ISSN: 1062-3701
eISSN: 1943-3522
JUFO-Level of this publication: 1
Open Access: Not an Open Access publication

Abstract

Three-ply paperboard was coated using
hydroxypropylated starch (HPS) and styrene–butadiene latex as
polymeric components and kaolin or synthetic layered silicate as
the functional pigment. The coatings were designed to modify the
surface characteristics of the substrate to enhance the printability
and barrier properties and prevent the migration of mineral oil. The
substrates were printed with aqueous dye-based inkjet inks and the
ink–substrate interaction and print quality characteristics such as
print density, mottling, bleeding, and wet and dry ink rub resistance
were determined. The coated substrates showed extraordinarily
high print density values and reasonable good dry rub resistance,
but low wet ink adhesion, which was ascribed to dissolution of
the coating–ink interface. Water vapor transmission rate (WVTR)
determinations confirmed that the coatings were sensitive to
moisture, since the WVTR values more than doubled when the
relative humidity was increased from 50% to 75%. The highest print
density (2.66 in the 100% black area) was achieved on silicate- filled
coatings, which was 97% higher than that of the uncoated reference.
On kaolin-containing coatings, the print density was 60% higher than
that of the uncoated reference. The AFM images revealed not only
that the starch–silicate coatings were remarkably smooth, but also
that they were more homogeneous than the pure starch coating.
Although the resistance of the studied coatings to liquid oils was in
most cases only moderate, the migration of a gaseous mineral oil
simulant through the coated sample was low. A small addition of
synthetic silicate effectively prevented the migration of mineral oil in
the liquid phase through coatings with a solely starch binder. This
work demonstrates that starch-based coatings can be designed
for high-quality inkjet printing with dye-based inks and that such
coatings can simultaneously inhibit the migration of mineral oil in
packaging applications, suitable for e.g., hybrid printing applications.


Research Areas

Last updated on 2018-19-10 at 07:55