Pigment coating of porous foam formed structures

Hanna Koskela (Corresponding author), Christiane Laine, Eija Kenttä, Antti Oksanen, Tuomas Turpeinen, Ulla Forsström

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review


Coating of bulky foam formed products having more surface voids is challenging with traditional application methods. Our aim was to improve the coating hold-out of foam formed webs. This was done either by precalendering or by surface foam coating with starch before pigment coating. The effects of these pretreatments were studied with a metered size press (MSP) and curtain coating. Foam formed samples had lower coating hold-out than water formed ones. Precalendering reduced the proportion of large pores of the structures and therefore improved coating hold-out. Applying starch with the foam coating reduced large pores at the surface. Precalendering improved coating hold-out and smoothness better than starch but simultaneously it reduced bulk. Starch applied by foam coating closed the surface effectively and maintained the high bulk. Non-contact curtain coating led to higher coating hold-out than the MSP application with a high pressure pulse. Curtain coating is a suitable method for porous foam formed structures but coating formulations should be further developed for different printing methods.

Original languageEnglish
Title of host publicationPaper Conference and Trade Show, PaperCon 2019
PublisherTAPPI Press
Number of pages9
ISBN (Electronic)978-151089394-8
Publication statusPublished - 2019
MoE publication typeA4 Article in a conference publication
EventPaper Conference and Trade Show, PaperCon 2019 - Indianapolis, United States
Duration: 5 May 20198 May 2019


ConferencePaper Conference and Trade Show, PaperCon 2019
Country/TerritoryUnited States


  • Aqueous foam
  • Calendering
  • Hold-out
  • Paper
  • Pigment coating
  • Starch
  • Surface properties


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