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|Researchers of the LGP2 (EFPG, INPG, CNRS, CTP)
Documents taken from the
"Scientific Report of the Laboratory of Pulp and Paper Science and Graphic
Arts - UMR 5518
Grenoble - France
January 2002-November 2005"
V - Packaging and converting
V - 1 - Introduction
The objective of the
Packaging and converting group is to develop knowledge
about the properties of complex fluids and solids used in this industrial sector, in order to propose
specific treatments to improve the runnability of the processes and the quality of the final products.
The three main topics developed in the packaging and converting
- Surface treatment.
- Mechanics - Engineering of paper and paperboard converting and
the study of functional properties of converted products.
- Cellulose- and starch-based Composites and Nano-composites
Improving basic knowledge in this field is a necessity
for the design, the realisation and the characterization of paper-based packaging. Work on
adhesion and coating will benefit the coating processes and the operations where waxes, hot melts,
lacquers and seals are used. Paper and paperboard converting and finishing include calendering, tube
formation, corrugated board and paperboard manufacturing, flexographic printing, cutting and
creasing. The functional properties of the converted products are studied in terms of quality and runnability.
The main studies currently carried out by our group are the
- Surface treatment of paper:
this topic includes different aspects, namely the rheology of coating colours,
paper coating, characterization of coated paper and their calendering.
Before paper coating, the colours are filtered in order to eliminate the
non-dispersed pigment particles. This topic constituted to study the
parameters affecting the rapid clogging of filters used in coating technology.
Other work on coating of papers was carried out and was aimed at establishing
relationships between the coating colours composition and the surface
properties of coated papers, namely its printability.
Calendering is a thermo-mechanical operation currently used in surface
treatment of paper. Its main objective is similar to that of coating. In this
context, a PhD thesis was also carried out and dealt with the development of
relationships between the process parameters and the thermo-physical
properties of the treated papers.
- Optimization of processes and materials used in paper
converting and finishing. First, an investigation aimed at the classification
of the different phenomena governing the dispersion of fibre glass in aqueous
media for the preparation of battery separators was carried out successfully.
The results obtained allowed the development of separators with an optimized
design for easy mounting and use. The second investigation in this field dealt
with the valorisation of different agricultural residues as a source of
lignocellulosic fibres for packaging materials. In fact, wheat straw, banana
and cartoon crops were submitted to different delignification processes and
the pulps obtained were used as starting materials to prepare fluting papers,
as well as, multi-layered materials such as tubes and reels.
- Preparation of new sustainable and biodegradable packaging materials. These studies consisted in the preparation and characterization of composite
films based on biodegradable matrices and reinforcing fibres. As an example, composite materials
based on hydroxypropyl cellulose (matrix) and cellulose fibres (reinforcing elements) were successfully
prepared and displayed promising mechanical and barrier properties. Recently, we started
developing the preparation of whiskers of cellulose and nano-particles of starch. After adequate
surface modification, they were incorporated in the formulation of nano-composites. This topic is
supported by the European Integrated Project
Some studies carried out in our group are presented in the next pages.