Experimental Method Development for MRI Moisture Measurements in Paper Materials
Typ
Examensarbete för masterexamen
Program
Publicerad
2022
Författare
Hobson, Stuart
Venkatesh, Niketh
Modellbyggare
Tidskriftstitel
ISSN
Volymtitel
Utgivare
Sammanfattning
An understanding of moisture transport within sized paperboards is an important
quality aspect for the packaging industry. In this study, the experimental technique
of magnetic resonance imaging (MRI) is used to develop a testing methodology
which can measure, characterise and quantify the transport of water within paper
materials.
A methodology for in-plane liquid uptake measurements within the MRI was developed
and found to be applicable for hydrophilic materials. Through thickness
testing was performed in the MRI and 1-D profiles were obtained along the throughthickness
direction of the paper materials with a spatial resolution of 31μm and a
temporal resolution of 2 minutes measurement acquisition time. To give further
insight into the mechanisms of liquid transport within the fibre structure of the paper
materials apparent diffusion coefficients were estimated and found to be on the
order of 10−12 m2/s which strongly suggest that the rate defining mechanism for hydrophobized
paper is moisture diffusion within the fibers. This study also explores
the various issues encountered during method development and lays a foundation
for further work.
Beskrivning
Ämne/nyckelord
MRI , Paperboard , Moisture diffusion; , Through thickness measurement