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Effect of pressure and time on water absorption of coated paperboard based on a modified Cobb test method
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences (from 2013).
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences (from 2013).
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences (from 2013). Karlstad Univ Karlstad, Surface Treatment Dept Engn & Chem Sci, Karlstad, Sweden..
2024 (English)In: TAPPI Journal, ISSN 0734-1415, Vol. 23, no 4, p. 221-230Article in journal (Refereed) Published
Abstract [en]

This manuscript presents the study of water absorption by paperboard subjected to water at high hydrostatic pressure based on a modified Cobb tester. The new tester is based on TAPPI Standard Test Method T 441; however, the water column can reach up to 550 mm. The evaluation consisted of measurements of water absorption for coated and uncoated paperboard at different exposure times from 5 s to 45 s and water column heights from 10 mm to 500 mm (corresponding to hydrostatic pressures 98 Pa and 4.9 kPa, respectively). The coatings were formulated as a combination of styrene acrylate (SA; two binder levels) and two types of ground calcium carbonates (differing particle sizes) to form the two pre -coating structures: open and closed. The coating weight was 6 g/m2 applied on 210 g/m2 solid bleached board (SBB). In addition, 210 g/m2 uncoated boards were studied. Characterization of the coatings was performed with scanning electron microscopy (SEM), mercury intrusion, and roughness. It was found that the new device properly mimics the conditions of the current Cobb tester. The characterization of the coating also confirmed the presence of more open/larger pores of open coatings, confirming the desired coating structure. The absorption of boards was mainly driven by exposure pressure by comparing with exposure time. This was already evident after shorter periods of exposure time at 5 s and also 15 s exposure time. Paperboards with open coatings showed slightly higher absorption than other boards.

Place, publisher, year, edition, pages
TAPPI Press, 2024. Vol. 23, no 4, p. 221-230
National Category
Paper, Pulp and Fiber Technology
Research subject
Chemical Engineering
Identifiers
URN: urn:nbn:se:kau:diva-99855DOI: 10.32964/TJ23.4.221ISI: 001215538600001Scopus ID: 2-s2.0-85192829793OAI: oai:DiVA.org:kau-99855DiVA, id: diva2:1864189
Funder
Knowledge Foundation, 20180036; 20180142Available from: 2024-06-03 Created: 2024-06-03 Last updated: 2024-06-18Bibliographically approved

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Mesic, BekoRättö, Peter

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