University of Oulu

Ilpo Niskanen, Janne Lauri, Jukka Räty, Rauno Heikkilä, Henrikki Liimatainen, Taro Hashimoto, Tapio Fabritius, Kaitao Zhang, Masayuki Yokota, Monitoring drying process of varnish by immersion solid matching method, Progress in Organic Coatings, Volume 136, 2019, 105299, ISSN 0300-9440,

Monitoring drying process of varnish by immersion solid matching method

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Author: Niskanen, Ilpo1,2; Lauri, Janne3; Räty, Jukka4;
Organizations: 1Faculty of Technology, Structures and Construction Technology, University of Oulu, P.O. Box 7300, FI-90014 Oulu, Finland
2Public Works Research Institute, 1-6 Minamihara, Tsukuba, Ibaraki 300-2621, Japan
3Faculty of Information Technology and Electrical Engineering, Optoelectronics and Measurement Techniques Research Unit, University of Oulu, P.O. Box 4300, FI-90014, Oulu, Finland
4Unit of Measurement Technology (MITY), University of Oulu, Technology Park 127, FI-87400 Kajaani, Finland
5Faculty of Technology, Fibre and Particle Engineering, University of Oulu, P.O. Box 4300, FI-90014, Oulu, Finland
6Department of Mechanical, Electrical and Electronic Eng., Faculty of Science and Engineering, Shimane University, 1060 Nishikawatsu-cho, Matsue-shi, Shimane 690-8504, Japan
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 0.4 MB)
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Language: English
Published: Elsevier, 2019
Publish Date: 2021-09-06


The characterization of the drying process of paints and coatings on the surfaces is important for many industrial applications. We present a new optical method to study the drying process of varnish based on immersion solid matching technique. The principle of the method is to match the refractive index of dry varnish with the added particles, making the dried varnish optically transparent. The state of the drying process can be evaluated by following the transparency of the varnish by visual inspection or imaging by camera. The method has several merits since it is non-contact, fast, simple and low-cost. In addition, particles that are invisible in dry varnish can provide improved properties such as hardness, abrasion and corrosion resistance or retard flammability without sacrificing the optical appearance of the coating.

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Series: Progress in organic coatings
ISSN: 0300-9440
ISSN-E: 1873-331X
ISSN-L: 0300-9440
Volume: 136
Article number: 105299
DOI: 10.1016/j.porgcoat.2019.105299
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
213 Electronic, automation and communications engineering, electronics
116 Chemical sciences
114 Physical sciences
111 Mathematics
Funding: Authors would also like to thank the financial support from the Academy of Finland’s FIRI funding (grant no. 320017).
Academy of Finland Grant Number: 320017
Detailed Information: 320017 (Academy of Finland Funding decision)
Copyright information: © 2019 Elsevier B.V. All rights reserved. This manuscript version is made available under the CC-BY-NC-ND 4.0 license