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Paper, print media and biomaterials

LGP2, a center of innovative research
LGP2, a center of innovative research

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LGP2 - Design of self-adhesive labels by microencapsulation adhesive

Published on January 14, 2013
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December 12, 2012

Robin Abderrahmen defended his PhD thesis from the University of Grenoble entitled "Design of self-adhesive labels by microencapsulation adhesive".

Laboratory of Pulp and Paper Science and Graphic Arts (LGP2)This thesis was prepared at the Laboratory of Pulp and Paper Science and Graphic Arts (LGP2), under the supervision of Professor Naceur Belgacem and Professor Didier Chaussy from Grenoble INP-Pagora.

The main objective of this study is to prepare innovative silicone liner-free labels. It can be achieved by the adhesive self protection', thanks to its incorporation into microcapsules. This allows the preparation of dry labels' gluing under the application of a pressure, which induces the rupture of the microcapsules, thus releasing the core material, a pressure sensitive adhesive. The first step was to analyse 3 water-based PSA in view of their encapsulation. Then, the most suitable adhesive was microencapsulated by coacervation (using biopolymer as shell) and by in situ polymerisation. Two other encapsulation processes (spray-cooling and spray-drying), were also carried out and were compared with the 2 former processes. Coating colour formulations were prepared with spray-cooling microcapsules (the most adhesive ones). Coating trials were carried out by blade coating, and by screen printing. Compatibility between microcapsules and the label making process, using a flexographic printing press, was determined. Finally, the mains characteristics of the prepared innovative products (adhesion, application pressure) were compared to industrial self-adhesive homologues, and found that they could be suitable for the preparation of silicon liner-free envelops and stamps.

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Date of update January 23, 2013

Grenoble INP Institut d'ingénierie Univ. Grenoble Alpes