Textile Calculations: Yarn Count Conversions & Production Formulas
A technical guide to textile spinning calculations. Includes yarn count conversion formulas (Tex, Denier, Ne), production calculation formulas for Blow Room and Ring Frame, and TPI/CSP definitions.
Yarn Count Conversion, Tex to Denier Formula, Ring Frame Production Formula, TPI Calculation, CSP in Textile, Cotton Yarn Sizes.
Q: What is Yarn Count?
A: It is a numerical expression which indicates the fineness or coarseness of the yarn. There are two systems for measuring yarn count:
- Direct System: Weight per unit length (e.g., Tex, Denier).
- Indirect System: Length per unit weight (e.g., English Count/Ne).
Q: What are the Count Conversion Formulas?
- To convert Denier to Tex: Tex = Denier / 9
- To convert Denier to Ne: Ne = 5315 / Denier
- To convert Tex to Ne: Ne = 590.5 / Tex
- To convert Ne to Tex: Tex = 590.5 / Ne
- To convert Ne to Denier: Denier = 5315 / Ne
Q: What are the Popular Yarn Sizes in the Market?
- Most Popular Cotton Yarn Sizes: 7s, 10s, 14s, 16s, 20s, 21s, 32s, 40s, and 60s.
- Less Popular Cotton Yarn Sizes: 6s, 8s, 12s, 13s, 24s, 30s, 33s, and 42s.
- Most Popular TC/CVC Yarn Sizes: 10s, 14s, 16s, 20s, 21s, 32s, 45s, and 60s.
Q: How to Calculate Yarn Production in Different Stages?
1. Blow Room Production:
Production in kg per shift =
(Length of Lap per yard × Lap weight in grains × Efficiency) / (7000 × 1.0936)
2. Carding Machine Production:
Production =
(Doff Speed RPM × π × Doffer Diameter × Efficiency × 60 × 8) / (36 × 840 × Ne × 2.204)
3. Speed Frame (Simplex) Production:
Production in lbs per shift (8 hrs) =
(Spindle Speed RPM × 60 × 8 × No. of Spindles × Efficiency) / (TPI × 36 × 840 × Roving Hank)
4. Ring Frame Production:
Production in hanks =
(Delivery Speed m/min × 60 × 8 × Efficiency) / (1.0936 × 840)
Q: What is Twist Per Inch (TPI)?
A: It is the number of twists in one inch of yarn.
Twist Per Inch (TPI) Formula:
TPI =
Twist Multiplier (TM) × √Count
Q: What is CSP?
A: CSP stands for Count Strength Product. It is the product of the English Count (Ne) and the Lea Strength in pounds.
CSP Formula:
CSP =
Ne × Lea Strength (lbs)
[Reference: Dr. M. A Sayeed]
