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  1. discrete element model
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Roller Compactor

Posted 02 Jan, 2008 in Tools

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Available Versions

  • 1.0 (published)

This tool is closed source.

Version 1.0 - published on 11 Jan. 2008
Contributor(s) Kamal Kuriyan
Purdue University
At a glance Calculate nip angle, normal and shear stresses for roller compactor using Johanson's model
Description

The impact of material properties and process parameters are determined using a continuum model. Normal stresses for roller compaction are calculated from Johanson's rolling theory. The boundary between the slip and nip regions is calculated using Johanson's criterion, i.e. gradients of stress in slip and nip regions are assumed to be equal at nip angle. Shear stresses are calculated from the normal stresses using the method of Schonert and Sander.

roller INPUT PARAMETERS:
Roll Gap / Roll Diameter,
Effective angle of friction,
Applied feed pressure,
Horizontal load ratio,
Compressibility.

OUTPUT:
Normal stress plot,
Shear stress plot,
Nip angle,
Slip region gradient plot,
Nip region gradient plot.

nipangle-compressibility Variation in nip angle
with compressibility
constant

nipangle-friction Variation in nip angle
with effective angle of
friction

credits

Model developed by A.J. Hlinak,
pharmaHUB tool developed by K. Kuriyan,
Pharmaceutical Technology and Education Center, Discovery Park, Purdue Univeristy

references

Johanson, J. R. (1965) A rolling theory for granular solids. J Appl Mech, 32(4), 842-848.
Sommer, K., Hauser, G. (2003) Flow and compression properties of feed solids for roll-type presses and extrusion presses. Powder Technol, 130(1-3), 272-276.
Schonert, K., Sander, U. (2002) Shear stresses and material slip in high pressure roller mills. Powder Technol, 122(2-3), 136-144.

publications

K. Kuriyan, A.C. Catlin, A.J. Hlinak, G. Joglekar, P. Basu, G.V. Reklaitis, Hub-based simulations of unit operations in pharmaceutical manufacturing, submitted to Computer Applications in Engineering Education.

Cite this work

If you reference this work in a publication, please cite as follows:

  • Kamal Kuriyan (2008), "Roller Compactor," http://pharmahub.org/resources/rollr.

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Tags
  1. dry granulation
  2. Johanson's model
  3. process modeling
  4. roller compaction