Impact of non-uniform water absorption on water-interference print mottle in offset printing

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Impact of non-uniform water absorption on water-interference print mottle in offset printing. / Thorman, Sofia; Ström, Göran; Gane, Patrick A.C.

In: Nordic Pulp and Paper Research Journal, Vol. 33, No. 1, 26.03.2018, p. 150-163.

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@article{1c4e17c19f8b4a49bcd05b66250a134f,
title = "Impact of non-uniform water absorption on water-interference print mottle in offset printing",
abstract = "Print mottle is a serious and yet common print defect in offset printing. An imbalance between the feed of fountain solution and the ability of the paper substrate to absorb and transport this water away from the surface can cause moisture/water interference problems. In the study presented here, we have investigated the uniformity of aqueous absorption and coating structure of pilot-coated papers with different types and dosages of dispersants and linked this to print mottle and uncovered areas (UCA). In earlier studies, the print quality of these papers indicated that a moderate addition of excess dispersant caused ink refusal, ink-lift-off (ink-surface adhesion failure) and water-interference mottle when printing at elevated fountain feed. In the present study, we have shown that a majority of the samples with uneven water/moisture absorption and an uneven burn-out reflectance tended to have more severe printing problems related to surface-moisture/water.An aqueous staining technique was used to characterise the absorption non-uniformities. This method has been developed previously with focus on absorption of flexographic water-based inks but can clearly give relevant information also for offset printing, when it comes to moisture/water interference mottle.",
keywords = "absorption non-uniformity, coated paper, dispersant, offset printing, uncovered area, water-interference mottle",
author = "Sofia Thorman and G{\"o}ran Str{\"o}m and Gane, {Patrick A.C.}",
year = "2018",
month = "3",
day = "26",
doi = "10.1515/npprj-2018-3011",
language = "English",
volume = "33",
pages = "150--163",
journal = "Nordic Pulp and Paper",
issn = "0283-2631",
number = "1",

}

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TY - JOUR

T1 - Impact of non-uniform water absorption on water-interference print mottle in offset printing

AU - Thorman, Sofia

AU - Ström, Göran

AU - Gane, Patrick A.C.

PY - 2018/3/26

Y1 - 2018/3/26

N2 - Print mottle is a serious and yet common print defect in offset printing. An imbalance between the feed of fountain solution and the ability of the paper substrate to absorb and transport this water away from the surface can cause moisture/water interference problems. In the study presented here, we have investigated the uniformity of aqueous absorption and coating structure of pilot-coated papers with different types and dosages of dispersants and linked this to print mottle and uncovered areas (UCA). In earlier studies, the print quality of these papers indicated that a moderate addition of excess dispersant caused ink refusal, ink-lift-off (ink-surface adhesion failure) and water-interference mottle when printing at elevated fountain feed. In the present study, we have shown that a majority of the samples with uneven water/moisture absorption and an uneven burn-out reflectance tended to have more severe printing problems related to surface-moisture/water.An aqueous staining technique was used to characterise the absorption non-uniformities. This method has been developed previously with focus on absorption of flexographic water-based inks but can clearly give relevant information also for offset printing, when it comes to moisture/water interference mottle.

AB - Print mottle is a serious and yet common print defect in offset printing. An imbalance between the feed of fountain solution and the ability of the paper substrate to absorb and transport this water away from the surface can cause moisture/water interference problems. In the study presented here, we have investigated the uniformity of aqueous absorption and coating structure of pilot-coated papers with different types and dosages of dispersants and linked this to print mottle and uncovered areas (UCA). In earlier studies, the print quality of these papers indicated that a moderate addition of excess dispersant caused ink refusal, ink-lift-off (ink-surface adhesion failure) and water-interference mottle when printing at elevated fountain feed. In the present study, we have shown that a majority of the samples with uneven water/moisture absorption and an uneven burn-out reflectance tended to have more severe printing problems related to surface-moisture/water.An aqueous staining technique was used to characterise the absorption non-uniformities. This method has been developed previously with focus on absorption of flexographic water-based inks but can clearly give relevant information also for offset printing, when it comes to moisture/water interference mottle.

KW - absorption non-uniformity

KW - coated paper

KW - dispersant

KW - offset printing

KW - uncovered area

KW - water-interference mottle

UR - http://www.scopus.com/inward/record.url?scp=85047988264&partnerID=8YFLogxK

U2 - 10.1515/npprj-2018-3011

DO - 10.1515/npprj-2018-3011

M3 - Article

VL - 33

SP - 150

EP - 163

JO - Nordic Pulp and Paper

JF - Nordic Pulp and Paper

SN - 0283-2631

IS - 1

ER -

ID: 25881750