**Different Formulas of Warp Calculation in Weaving**

**Mayedul Islam**

Assistant Chemist

Ha-Meem Group, Tongi, Gazipur, Bangladesh

Email: mayedul.islam66@gmail.com

**Introduction:**

During warp calculation in

**weaving**, the following formula will be found useful for determining various particulars required in practice. They have all been derived from the fundamental formula,**Count**= Number of hanks per lb.**1. Total number of ends in cloth,**

= Number of ends per inch in cloth × cloth width + extra ends for selvedge

Or,

= Number of ends per inch in reed × width of warp in reed + extra ends for selvedge

**2. Length of warp yarn in yds in cloth,**

= Tape length in yds × number of ends

**3. Total length of warp yarn in hanks ,**

Total number of ends × Tape length in yds

=

**………………………………………………**

840

**4. Tape length in yds,**

Count of warp yarn × weight of warp yarn in lbs × 840

=

**…………………………………………………………….**

Total number of ends

**5. Length of cloth in yds,**

Count of warp yarn × weight of warp in lbs × 840

=

**……………………………………………………………………..**– (up-take)

Total number of ends

**6. Total length of warp yarn in metres ,**

= Total number of ends × Tape length in metres.

Or,

= (Cloth length in metres + warp regain%) × Total number of ends.

**7. Weight of warp in lbs,**

Total length of warp yarn in hanks

=

**………………………………………….**

Count

Or,

Total number of ends × Tape length of warp in yds

= …

**…………………………………………………**

840 × Count

**8. Weight of warp in kg,**

Count in tex × Total length of warp yarn in metres × Total number of ends

=

**…………………………………………………………………………………………**

1000 × 1000

**9. Count of warp yarn,**

Total length of warp yarn in hanks

=

**…………………………………………………..**

Weight of warp in lbs.

Or,

Total number of ends × Tape length of warp in yds

=

**………………………………………..............………**

840 × Weight of warp in lbs.

**10. Count of warp yarn in tex,**

Weight of warp yarn in kg × 1000 × 1000

=

**…………………………………………………..............**

Total number of ends × Tape length of warp in metres

**Example 01:**

Calculate the total length and weight of warp in 100 mrtres of cloth having 3648 ends. The regain of warp is 10%. The count of the warp yarn is 20 tex.

**Solution:**

**Total length of warp in metres,**

(Cloth length in metres + regain% of warp) × total number of warp ends

= (100 + 10%) × 3648

= 110 × 3648

= 401280 metres

= 401.28 kms.

So, Total length of warp is 401.28 kms.

Now,

**Weight of warp in kg,**

Total length of warp yarn in km × count in tex

=

**………………………………………………………………..**

1000

401.28 × 20

=

**………….**

1000

= 8.0256 kg

So, the Weight of warp is 8.0256 kg. (

**ANS)**

**Example 02:**

Calculate the length of cloth you would produce from a weavers beam containing 100⅓ lbs of warp. The total number of ends in the warp is 3000 and the count of the warp yarn is 40s. allow ⅓ lb as waste and 5% up-take of warp in weaving.

**Solution:**

**Actual warp available is,**

= 100⅓ - ⅓

= 100 lbs.

Now,

**Length of cloth in yds,**

Count of warp yarn × weight of warp in lbs × 840

=

**……………………………………………………………………..**– (up-take)

Total number of ends

40 × 100 × 840

=

**………………………….**– 95%

3000

= 1064 yds.

So, Length of cloth in yds is 1064 yds.

**(ANS)**