Models of light diffusion within prints
Event details
| Date | 29.06.2009 |
| Hour | 14:15 |
| Speaker | Dr Jean-Francis Bloch, Institut National Polytechnique de Grenoble |
| Location |
BC-01
|
| Category | Conferences - Seminars |
Paper is a well known material as it is used every day, at least for
printing or read a newspaper. However, it exists for many other applications, such as filter, blotter, bank note, cigarette or tracing
papers. Classically, the expected end used properties do depend on the
considered application. However, they consist usually in a compromise
between the needed mechanical properties and the desired optical
properties. Essentially, colour gloss, opacity and brightness (and/or
whiteness) are the main optical properties taken into account.
However, these optical properties do depend on the structure of the
fibrous network constituting paper. Therefore, it is essential to be
able to describe the 3D structure of paper in order to understand and
analyse its optical properties. Furthermore, this 3D structure and its
relation with a fluid, such as ink, are of major interest for many
applications. Consequently, we will first present first the 2D characterisation of paper, in order to explain the relation between topography and gloss. Then the analysis of the penetration of ink will be exemplified using different experimental techniques. However, as fluid flows involve the 3D structure of paper, we will present experimental results of 3D structure obtained at the European Synchrotron Radiation Facility (ESRF, Grenoble) using X-Ray microtomography. The aim is here to characterise the 3D structure. Some example of paper structures will be presented including the description of both the fibrous structure and the fillers that modify the paper’s optical properties. ...
Practical information
- General public
- Free