Influence of environmental relative humidity on the polarization behaviour of paper and paper-dielectric structures
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ORIGINAL RESEARCH
Influence of environmental relative humidity on the polarization behaviour of paper and paper-dielectric structures R. Maldzius
. T. Lozovski . J. Sidaravicius . K. Backfolk . I. Heiskanen
Received: 22 April 2020 / Accepted: 12 September 2020 Ó Springer Nature B.V. 2020
Abstract In paper containing multilayer composite structures and laminates, polarization is usually investigated under dry environmental conditions. The aim of this research is to determine polarization dependence of paper and paper-dielectric structures on environmental relative humidity (RH). The role of each component was identified. The obtained and recorded data are used for identification and clarification of the physical mechanism of polarization. The polarization was studied by applying a dosed charging and forced discharge method and was evaluated by a depolarization potential and its formation kinetics. The polarization level of investigated structures increases with RH and is determined mainly by the paper (cellulose) and moisture content in it. In
composite structures of the paper between dielectric films and dielectric on paper the polarization dependence on RH correlates with moisture absorption isotherm. It was found that the surface electrical conductivity of paper distorts the results of the paper and structure paper on dielectric. Analysis of the formation kinetics of the depolarization potential together with the potential decay of the charged paper has determined the role of orientation polarization and space charges. The formation of space charges is faster than orientation polarization and dominates in polarization process at higher RH. The process modeling by superposition of two exponents confirms this polarization mechanism.
R. Maldzius (&) T. Lozovski J. Sidaravicius Institute of Chemical Physics, Vilnius University, Vilnius, Lithuania e-mail: [email protected] K. Backfolk I. Heiskanen Imatra Research Center, Stora Enso Oyj, Imatra, Finland K. Backfolk School of Energy Systems, Packaging Technology, Lappeenranta-Lahti University of Technology LUT, Lappeenranta, Finland
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Cellulose
Graphic abstract
Keywords charging
Polarization Paper Cellulose Dosed
Introduction Paper and packaging materials made from cellulose fiber offer a sustainable and versatile substrate for various end uses and applications. The usage of plain or coated paper and paperboard for packaging is growing and gradually replacing plastics (Qi 2017). Both neat cellulose fibers and the substrates made thereof provide surfaces for functionalization. One characteristic functionalization is coating or printing, which can provide e.g. high barrier properties or selective modification or deposition of chemicals or colorants. The unique properties of plain or coated paper offer an excellent substrate for conventional and digital laser and ink-jet printing (Thomson 1998; Johansson et al. 2007; Niskanen 2008; Abbott 2018). Paper is an important electrotechnical materia
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