Interfacial Adhesion Failure: Impact on print-coating surface defects

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Kamal Alm, Hajer,1981-KTH,Fiber- och polymerteknologi (författare)

Interfacial Adhesion Failure : Impact on print-coating surface defects

BokEngelska2016

Förlag, utgivningsår, omfång ...

Stockholm :KTH Royal Institute of Technology,2016
102 s.
electronicrdacarrier

Nummerbeteckningar

LIBRIS-ID:oai:DiVA.org:kth-194166
ISBN:9789177291367
https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-194166URI

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Språk:engelska
Sammanfattning på:engelska

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SwePubSwePub

Klassifikation

Ämneskategori:vet swepub-contenttype
Ämneskategori:dok swepub-publicationtype

Serie

TRITA-CHE-Report,1654-1081 ;2016:35

Anmärkningar

QC 20161019
The aim of this work was to develop a solid knowledge on formulation effects controlling offset ink-paper coating adhesion and to identify key factors of the coating and printing process affecting it. Focus lay on comprehending the impact of pigment dispersant on ink-paper coating adhesion and ultimately on the print quality of offset prints.The work covers laboratory studies, a pilot coating trial designed to produce coated material with a span in surface chemistry and structure, and an industrial offset printing trial.The lab scale studies quantified ink-paper coating adhesion failure during ink setting with a developed laboratory procedure based on the Ink-Surface Interaction Tester (ISIT) and image analysis. Additional polyacrylate dispersant resulted in slower ink setting and reduced ink-paper coating adhesion, with a dependence on its state of salt neutralisation and cation exchange, mainly in the presence of moisture/liquid water.The industrial printing trial on pilot coated papers was designed to study how these laboratory findings affected full scale offset print quality. These trials confirmed the dispersant-sensitive effect on ink-paper coating adhesion, especially at high water feeds. Evaluation of prints from the printing trial resulted in two fundamentally different types of ink adhesion failure being identified. The first type being traditional ink refusal, and the second type being a novel mechanism referred to as ink-lift-off adhesion failure. Ink-lift-off adhesion failure occurs when ink is initially deposited on the paper but then lifted off in a subsequent print unit. In this work, ink adhesion failure by this ink-lift-off mechanism was observed to occur more often than failure due to ink refusal.Print quality evaluation of the industrial prints suggested that water induced mottle was caused by a combination of ink-surface adhesion failure, creating white spots on the print, together with variation in ink layer thickness due to emulsified ink.

Ämnesord och genrebeteckningar

TEKNIK OCH TEKNOLOGIER Kemiteknik hsv//swe
ENGINEERING AND TECHNOLOGY Chemical Engineering hsv//eng
Ink-paper coating adhesion
offset printing
calcium carbonate pigments
polyacrylate
dispersant
print mottle
surface chemistry
hygroscopy of surfaces
coating structure
print quality
water interference mottle
Fiber- och polymervetenskap
Fibre and Polymer Science

Biuppslag (personer, institutioner, konferenser, titlar ...)

Wågberg, Lars,Prof.KTH,Fiber- och polymerteknologi(Swepub:kth)u14jbte3 (preses)
Ström, Göran,Dr.Innventia AB (preses)
Preston, Janet,Doc.Imerys Minerals Ltd (opponent)
KTHFiber- och polymerteknologi (creator_code:org_t)

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Av författaren/redakt...: Kamal Alm, Hajer ...; Wågberg, Lars, P ...; Ström, Göran, Dr ...; Preston, Janet, ...

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TEKNIK OCH TEKNOLOGIER: TEKNIK OCH TEKNO ...; och Kemiteknik

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Av lärosätet: Kungliga Tekniska Högskolan

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