Volume 12
Issue 2/volume12
Agricultural Engineering
JOURNAL OF
POLISH
AGRICULTURAL
UNIVERSITIES
Available Online: http://www.ejpau.media.pl/volume12/issue2/volume12/abs-09.html
COMPRESSION AND FLOW BEHAVIOUR OF COHESIVE POWDERS
Mateusz Stasiak1, Jürgen Tomas2, Marek Molenda1, Peter Müller2
1 Department of Physical and Technological Properties
of Agricultural Materials, Institute of Agrophysics,
Polish Academy of Science, Lublin, Poland
2 Department of Mechanical Process Engineering,
Otto-von-Guericke University, Magdeburg, Germany
ABSTRACT
Research was conducted to examine the influences of consolidation A strong influence of consolidation time on
time, consolidation pressure, temperature, addition of lubricant, speed of deformation
and dimension of the probe on properties of two powders – microcrystalline cellulose
(MCC) and potato starch (PS). A low pressure range (up to 10 kPa) was applied
in direct shear test to determine flowability and friction properties. A medium
pressure range (50–1000 kPa) was applied in the press shear cell to evaluate
friction properties of MCC. The compression behaviour of MCC was determined in
uniaxial compression tests at high pressure range (30–60 MPa).
flow function was observed. In the case of PS a strong slip stick effect was
also noted. An increase in temperature from 23°C to 40°C resulted in
a 10% increase of the internal friction angle value determined in the press shear
cell in the range of preshear displacement from 0.1 to 2 m. There were no
strong influences of temperature, speed of deformation and initial sample height
on compression behaviour determined in uniaxial compression tests at high pressure
range.
Key words: powder, flowability, compressibility, slip-stick effect.
Mateusz Stasiak
Department of Physical and Technological Properties
of Agricultural Materials, Institute of Agrophysics,
Polish Academy of Science, Lublin, Poland
Do¶wiadczalna 4,
P.O. Box 201, 20-290 Lublin 27, Poland
Phone: (+48) 81 743 85 58
Fax: (+48) 81 744 50 67
email: mstasiak@ipan.lublin.pl
Jürgen Tomas
Department of Mechanical Process Engineering,
Otto-von-Guericke University, Magdeburg, Germany
Marek Molenda
Department of Physical and Technological Properties
of Agricultural Materials, Institute of Agrophysics,
Polish Academy of Science, Lublin, Poland
Do¶wiadczalna 4,
P.O. Box 201, 20-290 Lublin 27, Poland
Peter Müller
Department of Mechanical Process Engineering,
Otto-von-Guericke University, Magdeburg, Germany
Responses to this article, comments are invited and should be submitted within three months of the publication of the article. If accepted for publication, they will be published in the chapter headed 'Discussions' and hyperlinked to the article.