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Calculation of Fabric Production

Calculation of Fabric Production
Rofiquzzaman Raju
Fabric Technologist,
B.J.Group, Mawna, Gazipur
Email: rtextile.finance@gmail.com



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

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