Preparation and investigation of unsupported multilayer coating composites concerning their in-plane stress-strain and bending characteristics

M. Wildberger, W. Bauer

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

Abstract

In many converting processes, the material behaviour of coated paper and especially of its coating layers is responsible for paper quality performance. Quality imperfections of printed products addressed in this paper are coating cracking and fold cracking which can lead to expensive claims. This study presents the results of a new methodology for preparation and testing of unsupported multilayer coating films concerning in-plane stress and bending behaviour. By applying the new methodology, multilayer coating composites were prepared and tested concerning material properties like e.g. E-modulus, in-plane stress-strain characteristics and bending characteristics. The influence of the synthetic binder (latex)-starch ratio and pigment type on the strength properties of unsupported single coating layers and multilayer coating composites was investigated. The in-plane stress-strain and bending stress measurements showed the embrittling or "hardening" effect of starch application on stress-strain curves (yielding behaviour) and bending behaviour of single and multilayer composites. Variation in pigment type at the equal latex-starch ratio had a comparably lower influence on stress-strain behaviour than the starch application; finer pigments with a steep particle size distribution led to a more ductile "softer" material behaviour at a lower level of maximum strength. The combination of fine pigments, low starch and high synthetic binder (latex) amount resulted in "soft" in-plane stress-strain behaviour at sufficient strength level and good bending stress development. The behaviour of multilayer coating composites is determined by the behaviour of the more rigid single coating layer leading to a coating composite with high E-modulus and low yielding behaviour. Low E-modulus and high yielding behaviour of multilayer coating composites lead to a lower bending stresses, which should lead to a less critical fold cracking behaviour (CaF).

Original languageEnglish
Title of host publicationTAPPI Advanced Coating Fundamentals Symposium Proceedings
Pages251-261
Number of pages11
Publication statusPublished - 2008
EventTAPPI Advanced Coating Fundamentals Symposium - Montreal, QC, Canada
Duration: 11 Jun 200813 Jun 2008

Conference

ConferenceTAPPI Advanced Coating Fundamentals Symposium
CountryCanada
CityMontreal, QC
Period11/06/0813/06/08

Fingerprint

Composite coatings
Multilayers
Starch
Pigments
Latex
Latexes
Coatings
Binders
Coating techniques
Stress measurement
Stress-strain curves
Particle size analysis
Hardening
Materials properties
Defects
Composite materials
Testing

ASJC Scopus subject areas

  • Surfaces, Coatings and Films

Treatment code (Nähere Zuordnung)

  • Basic - Fundamental (Grundlagenforschung)

Cite this

Preparation and investigation of unsupported multilayer coating composites concerning their in-plane stress-strain and bending characteristics. / Wildberger, M.; Bauer, W.

TAPPI Advanced Coating Fundamentals Symposium Proceedings. 2008. p. 251-261.

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

Wildberger, M & Bauer, W 2008, Preparation and investigation of unsupported multilayer coating composites concerning their in-plane stress-strain and bending characteristics. in TAPPI Advanced Coating Fundamentals Symposium Proceedings. pp. 251-261, TAPPI Advanced Coating Fundamentals Symposium, Montreal, QC, Canada, 11/06/08.
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