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

Fingerprint

Foams
Coatings
Cellulose
Water
Color
Foam
Microscopic examination
Liquids
Pressing
Penetration

Keywords

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

Cite this

@article{369b5fdf51a5437b8d9b798cac623466,
title = "Challenges and possibilities in coating of foam formed structure",
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.",
keywords = "foam forming, porous, structure, coating, metered size press, hold-out",
author = "Ulla Forsstr{\"o}m and Johanna Uotila and Katariina Torvinen and Harri Kiiskinen",
note = "SDA: SHP: Bioeconomy Project code: 86156",
year = "2016",
language = "English",
pages = "20 -- 27",
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issn = "1615-1720",
publisher = "DPW-Verlagsgesellschaft GmbH",
number = "2-3",

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Challenges and possibilities in coating of foam formed structure. / Forsström, Ulla; Uotila, Johanna; Torvinen, Katariina; Kiiskinen, Harri.

In: International Paperworld IPW, No. 2-3, 2016, p. 20 - 27.

Research output: Contribution to journalArticleProfessional

TY - JOUR

T1 - Challenges and possibilities in coating of foam formed structure

AU - Forsström, Ulla

AU - Uotila, Johanna

AU - Torvinen, Katariina

AU - Kiiskinen, Harri

N1 - SDA: SHP: Bioeconomy Project code: 86156

PY - 2016

Y1 - 2016

N2 - 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.

AB - 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.

KW - foam forming

KW - porous

KW - structure

KW - coating

KW - metered size press

KW - hold-out

M3 - Article

SP - 20

EP - 27

JO - International Paperworld IPW

JF - International Paperworld IPW

SN - 1615-1720

IS - 2-3

ER -