Alpaca Fiber Structure
what makes it unique
Cortical cells are the load-bearing elements of the fiber, whereas the cuticle imparts the inherent aesthetic qualities of the fiber such as softness of handle and luster. Other functions of the cuticle include water repellence, felting during washing, and resistance to chemical and physical attack. The entire assembly of cells is held together by a type of 'cement' called the intracellular binder.
Research has shown that the cuticle cells on sheep wool fiber protrude approximately 0.8 micron from the shaft whereas alpaca cuticle cells protrude approximately 0.4 micron. It would therefore be simple to conclude that the softness of alpaca over that of sheep wool of the same fiber diameter is due to the scale height (protrusion).
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December 12, 2011

