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The investigation of the dynamic visco-elastic functions of printing inks

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Summary

Measurements of the dynamic rigidities and viscosties of some inks have been made in the frequency range 0.01 to 25 c. p. s. in the linear region. The dependency of the visco-elastic properties on concentration of pigment and added solvent is discussed. The dynamic mechanical properties of non-thixotropic inks are found to be distinct from those of thixotropic inks.

Zusammenfassung

Es wurden Messungen der dynamischen Steifigkeiten und Viskositäten verschiedener Tinten im Frequenzbereich zwischen 0,01 und 25 Hz im linearen Bereich durchgeführt. Es wird die Abhängigkeit der viskoelastischen Eigenschaften von der Pigmentkonzentration und dem Lösungsmittelgehalt diskutiert. Es zeigt sich, daß die dynamisch-mechanischen Eigenschaften nichtthixotroper Tinten sich deutlich von denen thixotroper Tinten unterscheiden.

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Abbreviations

α :

cone angle

K :

torsional elastic constant for torsion bar

I :

moment of inertia

R :

radius of cone

f :

frequency

ω :

angular velocity of oscillation, ω=2πf

ϑ :

amplitude ratio. If θ1 is the angular amplitude of movement of the plate, which serves as torsion head and is thus related to the stress, and θ2 that of the cone, proportional to strain, then ϑ=θ1/θ2

ϕ :

phase lag of plate behind cone; complex rigidityG * (ω)=G′(ω)} + iG″(ω); dynamic viscosityη′=G″ (ω)/ω; loss tangent tanδ=G″/G′; limiting viscosity (ω→0) η0; and\(\mathop {\lim \eta ' = \eta _0 .}\limits_{\omega \to 0} \)

References

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Author notes

  1. A. F. Douglas, G. A. Lewis & A. J. B. Spaull

    Present address: The Chemistry Department, Brunel University, Middlesex, England

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    1. A. F. Douglas
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    2. G. A. Lewis
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    3. A. J. B. Spaull
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    Douglas, A.F., Lewis, G.A. & Spaull, A.J.B. The investigation of the dynamic visco-elastic functions of printing inks. Rheol Acta 10, 382–386 (1971). https://doi.org/10.1007/BF01993714

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    • DOI: https://doi.org/10.1007/BF01993714

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