Introduction:
Fabric production is the ultimate goal in weaving and knitting. For increasing productivity, production manager has to apply different formula. In this article I have given a few formulas which will be helpful for fabric manufacturing students and professionals.
Formula for Fabric Production Calculation:
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
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 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
