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EFFECT OF UV-TREATMENT ON
PROPERTIES OF COATED PAPER
WITH BIOPOLYMERS
Urška Vrabič Brodnjak, PhD
University of Ljubljana, Faculty of Natural Sciences and Engineering, Ljubljana, Slovenia
urska.vrabic@ntf.uni-lj.si
EFPRO-CEPI European Paper Week, 17th-19th November 2015

Why biopolymers?
Coatings with biopolymers
 Research focus
 Results
 Summary

 BIOPOLYMERS HAVE BEEN WIDELY STUDIED IN
RECENT YEARS
 COMMONLY USED BIOPOLYMERS: STARCH,
PECTIN, CHITIN, CHITOSAN, XYLAN, LIGNIN
 ENVIROMENTAL CONCERNS-LOW
ENVIRONMENTAL FOOTPRINT
 RECYCLABILITY OF PACKAGING MATERIALS
 GREAT BARRIER COATINGS ON PAPER, BOARD
ETC.

CHITOSAN AND RICE STARCH COATING
Improved:
 PHYSICAL PROPERTIES
 Tensile properties
 Rougness
 Mass per area
 Moisture…
 BARRIER PROPERTIES: gas, grease, moisture, …
 OPTICAL PROPERTIES
 Colour
 Gloss
 Opacity…
• Physical Properties
• Barrier Properties
• Optical Properties

WHY UV radiation/treatment?
- Increases bonding
- quicker drying
- Improves scratches, surface

RESEARCH
FOCUS
RESEARCH FOCUS
 Chitosan and rice starch coating
(two different ratios 2:1 and 1:1)
 UV treatment (drying paper)
 Improved mechanical, optical, barrier
properties
 Improved surface properties with the most
suitable ratio of the coating

FUNCTIONALISATION OF PAPER
SURFACE WITH CHITOSAN+RICE STARCH
COATING USING UV
 Potential target applications:
 Packaging materials for fruits, vegetables,
baker‘s wares
 Barrier properties which are very important
for biobased food packaging materials

Uncoated paper
Coated paper and dryed in a
standard drier (1:1)
Coated paper and dryed in a
standard drier (2:1)

Coated paper and dryed in UV
drier (1:1)
Uncoated paper
Coated paper and dryed in UV
drier (2:1)

 The tensile strength and elongation at break
increased on coated paper compared to uncoated.
 Optical properties of coated paper increased due to
smoother surface of the paper.
 Coated paper dried in a conventional drier has lower
tensile strength, elongation and break and water
vapour permeability due to coated paper treated with
UV drier.
 Observations using scanning electron microscope
have proven that mixture of chitosan and rice starch
penetrated into the paper and still exhibited good
water absorptivness and tensile properties.

 The results showed the changes of UV treated paper in
the FTIR spectra as expected.
 Paper coated with ratio 2:1 of chitosan and rice starch
showed increase in yellowing compared to coating
with ratio 1:1.
 The research has proven increased physical and
optical properties on coated, UV treated paper.
 To be continued….

THANK YOU FOR YOUR
ATTENTION!
Faculty of Natural Sciences and Engineering
Department of Textiles, Graphic Arts and Design
Snežniška 5, SI-1000 Ljubljana
Slovenia
E-mail: urska.vrabic@ntf.uni-lj.si

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