Fabric production is the ultimate goal in weaving and knitting. For increasing productivity, the production manager has to apply different formula. In this article, I have given a few formulas of calculation of fabric production which will be helpful for fabric manufacturing students and professionals.
Calculation of Fabric Production:
……………………………………………..Motor pulley diameter
1. Loom speed = Motor RPM x ————————————–
……………………………………………..Loom pulley diameter
…………………………………………Actual production
2. Loom Efficiency %age = ———————————– x 100
……………………………………..Calculated production
…………………………………….Yarn weight – Dryed yarn weight
3. Moisture Regain %age = ————————————————– x 100
……………………………………………….Dryed yarn weight
You may like: Standard Moisture Regain and Moisture Content of Fibers
………………………………………Yarn weight – dried yarn weight
4. Moisture Content %age = ———————————————— x 100
……………………………………………………..Yarn weight
…………………………………..Total ends x Tape length in metre
5. Warp weight in Kg. = ——————————————————
…………………………………………….1693.6 x Warp count
……………………………………RS in centimetres x Coth length in metres x PPI
6. Weft weight in Kg. = ———————————————————————————
…………………………………………………………4301.14 x Weft count
…………………………………………EPI PPI
7. Cloth weight in GSM = —————– + —————– x 25.6
…………………………………..Warp count Weft count
………………………………………..GSM (Grams per sq. metre)
8. Oz (Ounce) per sq.yard = ———————————————-
…………………………………………………………34
Material measurement :
For calculating of length of any rolled fabrics :
……..0.0655 (D – d) (D + d)
L = ————————————-
……………………….T
Where,
L = Length of material (feet)
t = Thickness of fabrics (inches)
D = Outside diameter (inches)
d = Inside diameter (inches)
Weight of yarn in a cloth:
The weight of cloth manufactured on the loom depends upon the weight of yarns in the warp and weft: ends/inch, picks/inch and the weight of size on the warp.
Therefore, Cloth weight = Weight of warp + Weight of weft + Weight of size (All in lbs.)
…………………………………………………..Total No. of Ends x Tape length in yds.
Where as Weight of warp in lbs = ——————————————————————
………………………………………………………………840 x Warp yarn count
Also Weight of weft in-lbs. =
…..Length of cloth (yds) x Picks/inch in cloth x Reed width (inch)
= —————————————————————————————————-
……………………………….840 x Weft yarn count
Author of this Article: Rofiquzzaman Raju Fabric Technologist, B.J.Group, Mawna, Gazipur Email: [email protected]