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Types of Doubling, uses and objectives

Ring doubling and two for one twister, quality required by yarn to get best-doubled yarn. The formula for double yarn count.

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Objectives of doubling

  • To increase the strength of the yarn
  • To increase smoothness, evenness, lusture, uniformity, and compactness of yarn.
  • To obtain the better deposition of a twist.

Doubling Uses

  • Jeans sewing thread
  • type cord
  • cable yarn
  • tufting yarn

Types of Doubling

    1. Ring DoublingThe difference of ring doubling from the ring is:
        • No drafting
        • Creel in a system is different & creel contains yarn(No rove)
        • Roller combination is different

      Doubling yarn is designated as follows:

      Ends up with 40 Count 2/40
      Ends up with 10 Count 3/10

 

  1. Two For One twister (TFO)Here yarn is transferred to a cone, then two ends yarns are combined (Doubled) and wound on a cone without twisting. Then the yarn is supplied to twister
    m/c where the twist is applied in such a way that one revolution of rotating disc inserts two round of twist. The twisted yarn is then wound on a cone.

Qualities of Single yarn to get best-Doubled yarn

  • The elongation of the yarn under lea strength tension should be uniform of the same count.
  • The twist should be uniform throughout
  • The breaking strength of yarn should not vary too much
  • 4% tolerance on either side should be allowed.

The formula for Double Yarn Count

    • Single yarn of the same count
Final count = Single yarn count
No. of doubling

 

  • Resultant count of component thread
    • Count: 1/N = 1/N1+1/N2 (N = Resultant counts, N1, N2= of same count yarn)
    • TPI of doubled yarn = TPI of single yarn (60-70%)
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