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Looseness in bovine leather: microstructural characterization.

Hannah C Wells1, Geoff Holmes2, Richard G Haverkamp1

  • 1School of Engineering and Advanced Technology, Massey University, Private Bag 11222, Palmerston North, New Zealand.

Journal of the Science of Food and Agriculture
|August 26, 2015
PubMed
Summary

Looseness in bovine leather, a defect reducing value, is caused by excessive collagen fibril alignment. This alignment weakens inter-layer connections and increases fibre gaps, despite higher tensile strength in loose leather.

Keywords:
collagenelectron microscopyleatherloosenessmicrostructuresmall-angle X-ray scatteringultrasonics

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Area of Science:

  • Materials Science
  • Biomaterials Engineering
  • Leather Technology

Background:

  • A significant portion of bovine leather exhibits looseness, a defect impacting appearance and value.
  • The underlying structural causes of leather looseness remain poorly understood.

Purpose of the Study:

  • To investigate the structural and mechanical properties of loose versus tight bovine leather.
  • To elucidate the physical basis of the looseness defect in leather.

Main Methods:

  • Characterization of loose and tight leather samples using small-angle X-ray scattering (SAXS).
  • Ultrasonic imaging for visualizing fibre distribution and density.
  • Electron microscopy to analyze collagen fibril structure and packing.
  • Tensile strength testing to quantify mechanical properties.

Main Results:

  • Loose leather exhibits more highly aligned collagen fibrils compared to tight leather.
  • Fibre packing is looser in loose leather, with increased inter-bundle gaps, particularly in the lower grain region.
  • Ultrasonic imaging effectively visualizes these structural differences in fibre packing.
  • Despite structural weaknesses, loose leather demonstrates higher tensile strength than tight leather.

Conclusions:

  • Excessive collagen fibril alignment, while typically associated with strength, paradoxically leads to the looseness defect in leather.
  • Understanding the structural basis of looseness is crucial for identifying and preventing this defect during leather manufacturing.