Challenges and possibilities in coating of foam formed structure

Research output: Contribution to journalArticleProfessional

Abstract

Foam formed paper was compared to water formed paper made with same process parameters. The variables in base papers were wet pressing line load, water/foam density and the amount of cellulose microfibrils. Test sheets were coated with a metered size press, with a pre-coating formulation containing CaCO3. Coating layer was analysed with microscopy and burn out tests. The results will be discussed in details. The main results are that the penetration of the coating colour clearly depends mostly on the used line load in wet pressing of the paper machine. With the highest line load, the penetration of the liquid phase is smaller and the coating colour stays more on the surface, while the base papers produced with the lowest line load in wet pressing had more bulky structure and more surface voids. With foam forming, the coating layer coverage is slightly poorer than with water forming. The addition of cellulose microfibrils to the base paper structure can improve the uniformity of the coating layer. In general, the surface of the base paper for coated products should be engineered to be dense.
Original languageEnglish
Pages (from-to)20 - 27
JournalInternational Paperworld IPW
Issue number2-3
Publication statusPublished - 2016
MoE publication typeD1 Article in a trade journal
Event27th PTS Coating Symposium 2015 - München, Germany
Duration: 16 Sep 201517 Sep 2015

Keywords

  • foam forming
  • porous
  • structure
  • coating
  • metered size press
  • hold-out

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