Hybrid yarns have reinforcing and matrix-forming filaments combined together in order
to reduce the problems associated with high melt viscosity of thermoplastic
matrices. Among hybrid yarns, commingled and air-textured yarns, which are produced
with air jets have demonstrated high flexibility and good mixing of constituent
filaments. Many research findings have been reported on the structure and properties
of intermingled and air-textured yarns having low-modulus apparel-grade filaments.
The relationships between air jet, filament yarn, and the processing parameters are
critically reviewed. It is emphasized that there is an immediate need to study the
mixing behavior of combination of high- and low-modulus filaments in air jet, which
has not been investigated in detail in the published literature, in order to improve
the mixing of these filaments. The methods used to characterize hybrid yarns are
discussed. The need to study and improve the stability of the hybrid yarns in terms
of maintaining the level of mixing of constituent filaments across the cross section
is also established.
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