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Yarn and Fabric Properties
•Structural differences between rotor-& ring-spun yarns
– It will be recalled that ring-spun yarn contains envelope twist [twisting in the fibres from outside inwards], whereas rotor-spun yarn has core twist [twisting in the fibres from the inside outwards]. – Rotor spun yarn is therefore more voluminous, more open & rougher than ring spun yarn. –The fibres in the envelope layer of a rotor-spun yarn can partly escape the twisting action   during spinning & therefore take up turns of twist. – They thus contribute relatively little to yarn strength & can more easily be rubbed together axially to form slubs, etc. – Rotor spun yarn generally needs rather more turns of twist than ring spun yarn. – Furthermore, the fibres in a rotor-spun yarn are less parallel than those in a ring-spun yarn. – The core twist structure & the lower degree of parallelism are the causes of lower strength of rotor-spun yarn, & also of most other character differences. –The role of the wrapping fibres should also not be overlooked, but it is less important than those roles mentioned above. – The positive characteristics of rotor-spun yarns become more marked the shorter the fibres in the strand. –The following sections will set out the most important differences in the characteristics of rotor-& ring-spun yarn [ of carded cotton].
•Rotor-spun yarn compared with ring spun yarn
Properties	Rotor Spun Yarns Compared With The Ring Spun Yarns
•Breaking strength.	Lower
•Coefficient of variation of strength	Better
•Elongation at break.	Often Higher
Mass irregularity [over short lengths]	Better
Imperfections	Lower
Volume	Greater
Resistance To Abrasion	Better
Stiffness	Higher
Handle	Harder
Aesthetic Properties
Surface	Rougher
Hairiness	Lower
Luster	Duller
Important Differences In Further Processing
•Tendency to form slubs under axial force.	Greater
Coefficient Of Friction	Higher
Knot (Loop) Strength	Lower
Resistance To Abrasion	Better
Hairiness	Lower
Tendency To Snarl	Lower
Work Capacity Under Cyclic Loading	Higher
Capacity To Take Up Dye	Higher
End Breaks In Warping	Lesser By 50%
Knots After Winding	Lesser By 15-17 /Kg.
Warp Breaks In Weaving	Lesser By 70%
Weft Breaks In Weaving	Lesser By 25%
Fabric Properties
Tensile Strength	Lesser
Tearing Strength	Lesser
Bursting Strength	Lesser
Appearance	More Uniform
Barring	Very Much Better
Cover	10% Better
Cleanliness	Better
Neppiness	Fewer Neps
Resistance To Abrasion	5-7% Better
Handle	Harsher Or Crisper
Thermal Insulation	10-15% Better
Air Permeability	15-25% Better
Absorption Of Water	Much Better
Take Up Of Dyes	Better
Shrinkage	Same
Raisings	Easier & Uniformer

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