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Influence of processing variables on the mechanical properties of extruded maize

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Abstract

Maize was extrusion cooked under different conditions of feed moisture and extruder screw speed to produce foams of different bulk density. The foams were tested in tension, com-pression and flexure according to British Standards for plastic materials. A power law corre-lation between mechanical properties and bulk density was used with a density power law index in the range 1.5 to 2.3. This represents a special case of Ashby's treatments of foams where the foam wall properties have not been included. These pore wall properties were a function of processing conditions. A pin identation test was used to obtain localized mech-anical properties and indicated the different deformation behaviour of low- and high-density foams together with the greater strength of the foam surface.

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Authors and Affiliations

  1. Sunderland Polytechnic, Chester Road, SR 1 3SD, Sunderland, UK

    R. J. Hutchinson & G. D. E. Siodlak

  2. Norwich Laboratory, AFRC Institute of Food Research, Colney Lane, NR4 7UA, Norwich, UK

    A. C. Smith

Authors
  1. R. J. Hutchinson
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  2. G. D. E. Siodlak
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  3. A. C. Smith
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Hutchinson, R.J., Siodlak, G.D.E. & Smith, A.C. Influence of processing variables on the mechanical properties of extruded maize. J Mater Sci 22, 3956–3962 (1987). https://doi.org/10.1007/BF01133345

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  • DOI: https://doi.org/10.1007/BF01133345

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