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Production Calculations

  • Turns /Metre   [Tpm] =rotor rpm {N} / yarn-delivery rate{ V Metre/min. }=N / v.
  • Turns / metre  [tpm] = twist multiplier * 100 / [tex]^1/2 = 100k / t ^ 1/2.
  • Yarn delivery rate = N / Tpm =N [T^1/2] / [100k] m/min.
  • Productions / spinning unit   [P] is directly proportional to the yarn delivery rate & linear density [tex]  I.E.  P= 60vt/1000=0.06vt therefore P={ n[t^1/2] /100k} 0.06t = 0.0006n [T ^3/2] /K gm/hrs.
  • Thus , the production per spinning unit of an open end spinning machine {at 100% efficiency} is determined only by the rotor speed , which is normally fixed for a given design , & the yarn linear density & twist .

 



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