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Impact of different calendering strategies on barrier coating pickup
RISE Research Institutes of Sweden, Bioekonomi och hälsa, Massa, papper och förpackningar.ORCID-id: 0000-0003-0783-4959
RISE Research Institutes of Sweden, Bioekonomi och hälsa, Massa, papper och förpackningar.ORCID-id: 0009-0005-9206-4128
RISE Research Institutes of Sweden, Bioekonomi och hälsa, Massa, papper och förpackningar.ORCID-id: 0000-0001-6169-8332
2023 (engelsk)Inngår i: TAPPI Journal, ISSN 0734-1415, Vol. 22, nr 11, s. 665-673Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Paper was pre-calendered in a pilot scale configuration with a traditional soft nip calender and a metal belt calender. All calendering strategies reduced surface roughness and permeability of the samples, but dif-ferent strategies affected the surface roughness and permeability differently. The metal belt calender seemed to have a larger effect on the large-scale variations compared to the soft nip calender.Six test points from the pilot calendered papers were chosen for laboratory coating studies. Uncalendered paper was included as reference samples. The calendered samples and the reference were pre-coated with a regular pig-mented coating consisting of a ground calcium carbonate (GCC) pigment and a styrene acrylate (SA) latex. Both uncoated and pre-coated substrates were barrier coated with a polyvinyl alcohol (PVOH) in one and two layers. The coating pickup was determined gravimetrically, and the barrier properties were evaluated with TAPPI Standard Test Method T 454 grease resistance test.All samples needed two PVOH coating layers to form a grease barrier. The uncalendered sheets showed the best results with one coating layer, but this was at the expense of a higher coating pickup compared to the calendered sheets. The barrier coating pickup could be reduced by a combination of high temperature metal belt calendering and pre-coating. The high temperature and long residence time in the nip enabled plasticization of the fibers. This led to an irreversible deformation, even after water application. This meant that the smoothness obtained during cal-endering would be less affected by water-induced roughening during the coating operation.Application: Most works on barrier research have previously focused on either coating formulations or coating processes. This work complements earlier research by demonstrating that the amount of required coating color can be reduced through an appropriate calendering strategy and use of pre-coating.

sted, utgiver, år, opplag, sider
TECH ASSOC PULP PAPER IND INC , 2023. Vol. 22, nr 11, s. 665-673
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Identifikatorer
URN: urn:nbn:se:ri:diva-70128DOI: 10.32964/TJ22.11.665OAI: oai:DiVA.org:ri-70128DiVA, id: diva2:1850149
Tilgjengelig fra: 2024-01-22 Laget: 2024-04-09 Sist oppdatert: 2024-02-27bibliografisk kontrollert

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