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The customer magazine of Rieter Spun Yarn Systems Vol  / No    June  / EN - page 20 / 24

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20 / 24

  • 

    LINK    /

TECHNOLOGY

Tab  Comparison of conventional and compacted ring yarn spun with objective on quality and production deviations from conventional spinning in bold type

Spinning Objective Quality and Production

Yarn parameters

Conventional Ringspinning



Compact Ringspinning

Yarn count Cotton Commercial staple Application Comber noil Twist multiplier αe Spindle speed maximum rpm Spindle speed average rpm Production g/Spindel/h Tenacity cN/tex Σ IPI Uster hairiness Ends down/  spih Yarn realisation Production/machine/year  

Ne  Shankar 

  •  

    /

knitting            

  •  

    kg

Ne  Shankar 

  •  

    /

knitting            

  •  

    kg



Rieter G 

  • 

    Rieter K  Com®



kg yarn in  out  kg cotton



  •  

    spindles   h/year

Tab  Comparison of conventional and compacted ring yarn spun with objective on optimised resources deviations to Table  in bold type

Spinning Objective Optimised Resources

Yarn parameters

Yarn count Cotton Commercial staple Application Comber noil Twist multiplier αeSpindle speed maximum rpm Spindle speed average rpm Production g/Spindel/h Tenacity cN/tex Σ IPI Uster hairiness Ends down/ spih Yarn realisation Production/machine/year  

Conventional

Ringspinn Ne  Shankar 

  •  

    /

knitting            

en

  •  

    kg



Compact- Ringspinnen

Ne  Shankar 

  •  

    /

knitting            

  •  

    kg



Rieter G 

  • 

    Rieter K  Com®



kg yarn in  of  kg raw cotton



  •  

    spindles   h/year

There are distinct differences in the yarns’ quality values the tenacity of the compact yarn increases from  cN/tex  to  cN/tex  yarn imper- fections are marginally lower but Uster hairiness is

  • 

    considerably reduced from  to  Optimized raw material utilization as the spinning objective

Manufacturers of knitting yarns use raw materi- al with a higher short fiber content on the compact spinning machines for certain applications

In Table  conventional ring spinning is used as a reference with the same parameters and yarn prop- erties as in Table  In addition to the twist factor compact yarn also differs in the level of noil extrac- tion in this final spinning process

Based on the fundamentally higher level of yarn te- nacity comber noil was reduced by  from  to  in compact spinning At the same time te- nacity declines only insignificantly from  to

    • 

      cN/tex but is still clearly superior to conven- tional ring-spun yarn with a figure of  cN/tex Despite the higher twist factor αe the same reduc- tion in noil extraction in conventional ring spinning still results in a low yarn tenacity of  cN/tex This figure is no longer acceptable for spinning mills since it is below the required limit for its yarn ap-

  • 

    plication

The same applies to yarn imperfections With the re- duction in noil extraction they increase from  to

  • 

    IPI in compact yarn and from  to  IPI in

conventional ring-spun yarn The first figure is still acceptable for the end-user of the yarn but an IPI of

  • 

    is not A parallel trend is also apparent in Uster

hairiness

Yarn realization ie yarn output in percent per kg of virgin cotton used one of the customary reference factors used in Indian spinning mills increases from

  • 

    to  due to the reduction in noil extraction

in compact spinning

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