Weaving Calculations

A guide to calculations relating to yarn and cloth and all processes of weaving.It includes reed count, reed width, Maximum EPI for a particular count, weave density, crimp percentage, cloth cover factor etc.

1. Reed Count
   It is calculated in stock port system.No. of dents in 2 inches is called Reed Count.
   Reed Count = EPI/(1 + Weft crimp %age)

2. Reed Width
   Reed Width = Cloth Width *(100+ weft crimp %age)/100

3. Crimp Percentage
   Crimp %age = {(Warp length – Cloth length)/Cloth Length}* 100
   Crimp %age = {(Warp width – Cloth width)/Cloth width}* 100

4. Cloth Cover Factor

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2. 

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4. other design = (Ends /Repeat * 1/Yarn Diametre)/ (No of intersections/repeat+ ends/repeat)

   Warp requirement to weave the cloth
   

5. For silk and Polyester

   Allowance for count in bleached and Dyed fabric

   1.Count becomes 4%
   2. FinerDyed counts become max 6% Coarser

   Fabric Production Calculation

   
   

6. 
   

7. Material Measurement
   To calculate the length of any rolled fabrics, this formula gives the nearest accuracy.
   L = {0.0655(D-d)(D+d)}/t
   Where L = Length of material (Feet)    t = Thickness of fabrics (inches)
   D = Outside diameter (inches)   d = Inside diameter (inches)

   The weight of yarn in a cloth
   The weight of cloth manufactured on looms 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.)
   Whereas Weight of warp in lbs. = (Total No. of Ends * Tape Length in Yards)/(840 * warp yarn count)

8. Warp Weight in Kg = (Total Ends * Tape Length in meters)/(1693.6 * Warp Count)

   Weft Weight in Kg = (R.S in centimetres * cloth length in metres * PPI )/(4301.14 * weft Count)

   Cloth weight in GSM = {EPI/Warp Cout)+(PPI/Weft count)}* 25.6

   oz (ounce ) per sq. yard = GSM(Grams per sq. meter)/34

9. 
   

10. Loom Speed = Motor RPM * (Motor Pully Diametre)/(Loom Pully Diametre)

Loom Effeciency Percentage = (Actual Production/Calculated Production )* 100

11. Moisture Regain Percentage = {(Yarn Weight – Dried Yarn Weight)/Dried Yarn weight} * 100

    Moistue Content Percentage = {(Yarn Weight – Dried Yarn Weight)/Yarn weight} * 100

12. Warp weight in grams /metre ={(Total Ends * count (Denier) )/9000} * wastage % * crimp %

    Weft weight in grams /metre = {(R.S in inches * count(Denier)* PPI)/9000}* wastage % * crimp %

13. Warp weight in grams /metre = {(Total Ends * 1.0936 * 453.59 * crimp %)/(840 * count)} * wastage %

    Weft weight in grams /metre ={(R.S. in inches * 453.59 * PPI)/(840 * count)} * wastage % * crimp %

    Cloth length in metres with given weft weight=( weft weight in kgs * weft count * 1848 * 0.9144)/(PPI * R.S in inches)。