Finally, particles and fibres may be folded due to the pelleting process and thus plied
around each other (Rumpf, 1958). This phenomenon will also aid in building structure in
the pellet. However, up until now no theoretical framework has been developed to
quantify this type of binding (Rumpf, 1958). In Thomas et al. (1996a) some of the
effects of raw material components, for instance starch, protein and fibre, are discussed
with respect to their effects on physical pellet quality