34
Y. Jhanji et al.
packing density in the outermost zone of the yarn cross-section. Rotor spun yarn has
a bipartite structure with an inner core which forms the bulk of the yarn and an outer
zone of wrapper fibres occurring irregularly along the core length. Rotor yarn shows
maximum packing density in the first zone from the core. The core part of rotor yarn is
relatively dense structure; sheath part is a less dense structure with belly-bands [3–5].
Several researchers have studied the influence of various yarn variables such as yarn
types, yarn spinning systems and fibre variables such as fibre fineness, fibre crosssectional shapes on comfort properties of woven and knitted fabrics. Behera et al.
[6] compared the comfort properties of the ring, rotor and friction spun yarn fabrics
and suggested that in the absence of perspiration, rotor spun yarn would be superior
to ring-spun yarns. Lord [7] investigated the relative moisture uptake characteristics
of ring and open-end yarns and reported that open-end yarn wicked better and more
evenly but for the given yarn count elevated about the same volume of water as
ring yarn. Erdumlu and Saricam [8] studied the wicking and drying properties of
vortex spun yarns and knitted fabrics in comparison with ring-spun yarns and fabrics
and concluded that fabrics knitted from ring-spun yarns wicked and absorbed water
more evenly than fabrics knitted from vortex spun yarns. There is a lack of systematic
study on the influence of yarn spinning systems on thermo-physiological properties
of plated knit structures. Yarns made on different spinning systems vary in their
structure and packing which may influence the transfer of moisture vapour and liquid
moisture through fabrics. Therefore, the selected variable is crucial in influencing the
moisture management properties of fabrics. The present study, therefore, attempts
to study moisture management properties of ring vis a vis rotor yarn plated knit
structures.
2 Materials and Methods
2.1 Materials
Cotton and polyester fibres were used in the production of the yarn samples. Cotton
carded roving of 0.9 hank was used to spin 24 Ne single ring-spun yarn on LR G5/1
ring spinning system. Cotton carded sliver of 0.12 hank was used for the production
of 24 Ne single rotor yarn on Trytex rotor spinning machine. The polyester fibre of
1.1, 3.3 decitex and circular profile was used to spin 24 Ne single ring-spun polyester
yarns on 6/S LMW pilot plant ring frame. The SEM images of the ring and rotor
spun yarn is provided in Fig. 1. The three yarn samples in totality were used for
the preparation of four single jersey plated fabrics. All the samples were prepared in
plating relationship with ring and rotor cotton yarn in the outer and polyester fibres in
the inner layer. The fabric samples were prepared on hand-operated flat-bed knitting
machine (Elex, China) with machine gauge of 14, needle bed of 42 inches and 588
needles in each bed. Table 1 summarises the plated fabric details.
Y. Jhanji et al.
packing density in the outermost zone of the yarn cross-section. Rotor spun yarn has
a bipartite structure with an inner core which forms the bulk of the yarn and an outer
zone of wrapper fibres occurring irregularly along the core length. Rotor yarn shows
maximum packing density in the first zone from the core. The core part of rotor yarn is
relatively dense structure; sheath part is a less dense structure with belly-bands [3–5].
Several researchers have studied the influence of various yarn variables such as yarn
types, yarn spinning systems and fibre variables such as fibre fineness, fibre crosssectional shapes on comfort properties of woven and knitted fabrics. Behera et al.
[6] compared the comfort properties of the ring, rotor and friction spun yarn fabrics
and suggested that in the absence of perspiration, rotor spun yarn would be superior
to ring-spun yarns. Lord [7] investigated the relative moisture uptake characteristics
of ring and open-end yarns and reported that open-end yarn wicked better and more
evenly but for the given yarn count elevated about the same volume of water as
ring yarn. Erdumlu and Saricam [8] studied the wicking and drying properties of
vortex spun yarns and knitted fabrics in comparison with ring-spun yarns and fabrics
and concluded that fabrics knitted from ring-spun yarns wicked and absorbed water
more evenly than fabrics knitted from vortex spun yarns. There is a lack of systematic
study on the influence of yarn spinning systems on thermo-physiological properties
of plated knit structures. Yarns made on different spinning systems vary in their
structure and packing which may influence the transfer of moisture vapour and liquid
moisture through fabrics. Therefore, the selected variable is crucial in influencing the
moisture management properties of fabrics. The present study, therefore, attempts
to study moisture management properties of ring vis a vis rotor yarn plated knit
structures.
2 Materials and Methods
2.1 Materials
Cotton and polyester fibres were used in the production of the yarn samples. Cotton
carded roving of 0.9 hank was used to spin 24 Ne single ring-spun yarn on LR G5/1
ring spinning system. Cotton carded sliver of 0.12 hank was used for the production
of 24 Ne single rotor yarn on Trytex rotor spinning machine. The polyester fibre of
1.1, 3.3 decitex and circular profile was used to spin 24 Ne single ring-spun polyester
yarns on 6/S LMW pilot plant ring frame. The SEM images of the ring and rotor
spun yarn is provided in Fig. 1. The three yarn samples in totality were used for
the preparation of four single jersey plated fabrics. All the samples were prepared in
plating relationship with ring and rotor cotton yarn in the outer and polyester fibres in
the inner layer. The fabric samples were prepared on hand-operated flat-bed knitting
machine (Elex, China) with machine gauge of 14, needle bed of 42 inches and 588
needles in each bed. Table 1 summarises the plated fabric details.