Flocculation and rheological properties of pulp suspensions

Daisuke Tatsumi, B. Chen, D. Inaba, T. Matsumoto

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Rheological properties of pulp fiber suspensions were investigated in the wide range of fiber concentrations. In the low concentration range, the structure of the flowing suspension was observed with a high speed CCD camera. The flow properties of the suspensions were discussed from the viewpoint of the structural change of the suspensions. With two-dimensional fast Fourier transform technique, the power spectral patterns of the suspensions were obtained. According to Guinier approximation, the radius of gyration Rg of the flocks in the suspensions can be calculated from the power spectral patterns. In the high concentration range, the dynamic storage moduli G' were independent of the angular frequency; they were considered to be the pseudo-equilibrium moduli. The power law correlation was found between the pseudo-equilibrium moduli Ge and the volume concentrations cv of the suspensions, i.e. Ge = Acvα. The factor A changed with the beating degree, so that it reflects the individual fiber characteristics. On the other hand, the exponent α was constant (α = 3), regardless of the beating degree. It indicates that the exponent reflects the properties of the whole suspensions.

Original languageEnglish
Title of host publicationProceedings of the Pulp and Paper Research Conference
Pages46-49
Number of pages4
Publication statusPublished - 2001
Externally publishedYes
Event68th Pulp and Paper Research Conference 2001 - Tokyo, Japan
Duration: Jun 18 2001Jun 19 2001

Other

Other68th Pulp and Paper Research Conference 2001
CountryJapan
CityTokyo
Period6/18/016/19/01

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Materials Science(all)

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