Consolidation of particulate suspension - model study with plastic pigments

Martti Toivakka, Pekka Salminen, Yohannes Chonde, Douglas Bousfield

    Research output: Chapter in Book/Conference proceedingConference contributionScientificpeer-review


    The microscopic mechanisms and parameters controlling consolidation and leveling of particulate suspension coatings on paper were studied.  A simplified model system consisting of a model suspension of plastic pigment and impermeable substrates with well defined topog. was used.  The suspension contains spherical carboxylated polystyrene plastic pigment in water and the substrates were a photocopier transparency and an ink jet printer transparency.  A math. model based on a dynamic simulation technique was used to clarify the mechanisms influencing leveling of suspensions.  High initial solids content resulted in smooth surfaces, high opacity, and high light scattering efficiency of the coated samples.  The compression of electrostatic potential through addn. of electrolyte resulted in high packing d. of the coating layer.  The leveling movement of the particulate suspension was limited by build-​up of a dense layer of particles at the coating-​air interface, and by flocculation of the suspension.  The difference in immobilization and initial solids content controlled the final surface roughness of the coatings.
    Original languageUndefined/Unknown
    Title of host publication1997 TAPPI Advanced Coating Fundamentals Symposium
    PublisherTAPPI Press
    Number of pages13
    ISBN (Print)9780898526899
    Publication statusPublished - 1997
    MoE publication typeA4 Article in a conference publication
    Eventconference; 1997-05-09; 1997-05-10 - TAPPI Advanced Coating Fundamentals Symposium
    Duration: 9 May 199710 May 1997


    Conferenceconference; 1997-05-09; 1997-05-10

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