THE EFFECTS OF BIOLATEX BINDERS ON THE DYNAMIC WATER
RETENTION PROPERTIES OF PAPER COATING FORMULATIONS
Authors*: Steven Bloembergen
Marcelo Pampolha Santos
Phil Greenall
Ralph DeJong
Jae Y. Shin
Nathan Jones
Paul D. Fleming
Margaret K. Joyce
Ik Lee
ABSTRACT
The following paper is a continuation of findings presented by the
authors at PaperCon 2012 demonstrating the interesting rheological
properties of biolatex binder dispersions and their coating colors
relative to conventional coating starches and SB latex binders. The
previous work indicated that the rheological performance of biolatex
binder is significantly different from that of conventional cooked
coating starches and all-synthetic latex containing formulations. This
study investigates the dynamic water retention and wall slip properties
of the same materials in order improve the understanding on coater
runnability performance. Ensuring the correct rheology and water
retention of coating colors is important as coater speeds increase and
in order to achieve good runnability, productivity and final product
quality it is critical to have a comprehensive understanding. It is
common that quality and runnability problems originate from the
interaction between base paper and the water phase of the coating
color. Failure to control this interaction can lead to excessive migration
of coating color to the base paper. This results in poor machine
runnability, unstable systems and a non-uniform coating layer. In
these evaluations an ultra-high shear ACA Viscometer (ACAV) was
used to provide further insight into the wall slip properties of coating
colors at shear rates that are relevant to industrial-scale paper coating
processes. Results from these studies in combination with the results
from previously presented rheological studies help explain some of
the fundamental differences of these binder systems.
Keywords: biolatex binders, dynamic water retention, rheological
performances, SB latex binders, wall slip properties.
O PAPEL vol. 75, num. 3, pp. 55 – 66 MAR 2014
RETENTION PROPERTIES OF PAPER COATING FORMULATIONS
Authors*: Steven Bloembergen
Marcelo Pampolha Santos
Phil Greenall
Ralph DeJong
Jae Y. Shin
Nathan Jones
Paul D. Fleming
Margaret K. Joyce
Ik Lee
ABSTRACT
The following paper is a continuation of findings presented by the
authors at PaperCon 2012 demonstrating the interesting rheological
properties of biolatex binder dispersions and their coating colors
relative to conventional coating starches and SB latex binders. The
previous work indicated that the rheological performance of biolatex
binder is significantly different from that of conventional cooked
coating starches and all-synthetic latex containing formulations. This
study investigates the dynamic water retention and wall slip properties
of the same materials in order improve the understanding on coater
runnability performance. Ensuring the correct rheology and water
retention of coating colors is important as coater speeds increase and
in order to achieve good runnability, productivity and final product
quality it is critical to have a comprehensive understanding. It is
common that quality and runnability problems originate from the
interaction between base paper and the water phase of the coating
color. Failure to control this interaction can lead to excessive migration
of coating color to the base paper. This results in poor machine
runnability, unstable systems and a non-uniform coating layer. In
these evaluations an ultra-high shear ACA Viscometer (ACAV) was
used to provide further insight into the wall slip properties of coating
colors at shear rates that are relevant to industrial-scale paper coating
processes. Results from these studies in combination with the results
from previously presented rheological studies help explain some of
the fundamental differences of these binder systems.
Keywords: biolatex binders, dynamic water retention, rheological
performances, SB latex binders, wall slip properties.
O PAPEL vol. 75, num. 3, pp. 55 – 66 MAR 2014
