Surface elastic effects in premetered coating techniques

Jose E. Valentini, John T. Chandler, Qiang Jiang, Yee C. Chiew, Leslie J. Fina

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

The effect of the dilational surface elasticity ∈ on coating was investigated in two-layer slide coatings and single-layer slot and curtain coating experiments, respectively, up to 2 m/s. In the slide experiments both the surfactant concentration and ∈ were varied in the lower layer. While the position of the static contact line (SCL) is a function of the elasticity modulus ∈, the dynamic contact line (DCL) position is insensitive to this variable. Also, the vacuum range increases with increasing the modulus ∈. Best correlations were obtained when ∈ was measured at 1-2 Hz with a longitudinal wave generator. In curtain coating, the curtain edges can be stabilized and the wet thickness decreased by increasing the elasticity ∈. Also, in slot coating experiments the minimum wet thickness correlates with ∈ as well. The modulus that best characterizes these coating techniques was determined at 0.1-0.2 Hz by means of a Langmuir trough.

Original languageEnglish (US)
Pages (from-to)434-449
Number of pages16
JournalIndustrial and Engineering Chemistry Research
Volume35
Issue number2
DOIs
StatePublished - Feb 1996

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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