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Title: Structure and properties of polyester MJS plied yarns
Authors: Tyagi, G K
Patnaik, A
Goyal, A
Salhotra, K R
Ishtiaque, S M
Keywords: Air-jet spinning;Flexural rigidity;MJS yarn;Plying;Polyester yarn;Yarn properties
Issue Date: Sep-2002
Publisher: NISCAIR-CSIR, India
Abstract: The influence of ply twist and twist direction on the structure and properties of polyester MJS yarns has been studied. It is observed that the effect of plying on fibre and yarn structural parameters is significant. If the direction of Z-wrapped surface fibres is coincident with the direction of ply twist, the helix angle and helix diameter are high, but the mean fibre extent is very low. The increase in ply twist factor results in larger helix angle, larger helix diameter , smaller yarn diameter and lower fibre extent. Yarn properties also remarkably improve after plying. The improvement in yarn properties depends upon the amount and direction of ply twist. A plied yarn produced by twisting in a direction opposite to that of wrapping of surface fibres is stronger, less extensible, less rigid, more even , and has higher abrasion resistance. Yarns plied in the Z-direction are more rigid than those plied in the S-direction. While the flexural rigidity of yarns plied in the S-direction with higher ply twist factor is considerably lower than that of the corresponding single yarns, the flexural rigidity of those yarns ply twisted in the Z - direction invariably decreases as the ply twist factor is increased.
Page(s): 236-241
ISSN: 0975-1025 (Online); 0971-0426 (Print)
Appears in Collections:IJFTR Vol.27(3) [September 2002]

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