Question 47 (Textile Engineering & Fibre Science)
A core spun yarn of 30 tex is to be produced with 10% core by weight. If cotton roving count is 540 tex, the required draft on the ringframe will be __20__.
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Given in the question–
Core spun yarn tex=30 tex
Core % by weight=10%
Cotton roving count=540 tex
Draft=?
Calculation–
Cotton yarn tex=Core yarn tex(1-core% by weight/100)
=30(1-10/100)
=30(1-0.1)
=30 x 0.9
Cotton yarn tex=27.0
Formula,
Draft=Feed count/Delivery count
Draft=540/27
Draft=20 (Answer)