Predicting The Causes Of Operational Anomalies
In Blade Coating
Author(s)
P. Alam, C. Stoor & M. Toivakka
Abstract
Blade coating is a high speed (~ 20ms-1) coating operation that involves the
squeezing of shear thinning coating slurry between a base paper substrate and a
steel metering blade. The gap between the blade and the paper can be as small as
1μm and mineral pigments in the slurry can become trapped, giving rise to
streaks and scratches on the coating surface. The objective of the research
presented herein is to develop a model for simulating the process of blade
metering and to use the model to investigate operational anomalies connected to
the process. The effects of specific variables were studied notably; blade shape
and backing roll stiffness. Virtual experimentation was undertaken to study the
deformation of the paper surface, the coating colour thickness and the position of
the stagnation point (where pigments may gather). The choice of blade type was
found to have a highly localised influence on the area close to the nip. The
backing roll stiffness was shown to be one of the most important parameters in
blade metering. Lowering the stiffness decreases the coating thickness and
pushes the stagnation point further away from the heel region.
Keywords: solid mechanics, fluid dynamics, multiphysics, modelling simulation,
metering, coating, time dependent non-Newtonian hyperelastic process
engineering.
1 Introduction
The coating of paper is a process by which coating colour is applied to one or
both sides of the paper. Paper and board are primarily coated in order to improve
the optical and printing properties. Though, functional coatings might be coated
on a variety of speciality papers, such as greaseproof paper for food packaging
[1]. Blade coating is currently the most commonly used method for pigment
Keywords
solid mechanics, fluid dynamics, multiphysics, modelling simulation,
metering, coating, time dependent non-Newtonian hyperelastic process
engineering
Related Book
Other papers in this volume
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