**Rana Sohel**

Executive Engineer

Sunman Textile Mills Ltd. Chittagong

**Cell:**+8801912-420118

**Email:**rsohel07tex@gmail.com

**Winding:**

Winding is the process of transferring yarns from ring, bobbin, hank into a suitable package. It is one of the most important operation, which is mainly occurred in spinning section. Besides, it is also important in fabric manufacturing. In fabric manufacturing, directly winding is not so much important, but rewinding is so important.

**Types of winding:**

There are three types of winding process

- Parallel winding
- Nearly parallel winding
- Cross winding

**Formulas of Winding:**

Quantity of yarn in lbs to be wound

**1. Time required**=

**…………………………………………………….**

Actual production in lbs/hrs X No. of drums

Actual Production

**2. Winding Efficiency**=

**……………………………………………**X 100%

Calculated Production

**Actual Production < Calculated Production**

*Note:*Calculated Production - Actual Production

**3. Efficiency loss**=

**………………………………………………….**X 100%

Calculated Production

**Mathematical Problems and Solutions**

*******How much time will be required to wind 2388 lbs of 20s cotton on 40 drums of a super speed cone winder, if the calculated of winding is 1298 yds per min and the efficiency is 80%.

**Solution:**Given that,

**Quantity of yarns in lbs = 2388 lbs

**

**Yarn count**= 20s

**No. of drums = 40

**Calculated rate of winding in minutes = 1298 yds

1298

=

**………………….**Hank

840

**Efficiency = 80%

80

=

**…………….**

100

**Required time = ?

**We know,**

Quantity of yarn in lbs to be wound

**Time required**=

**…………………………………………………….**

Actual production in lbs/hrs X No. of drums

Quantity of yarn in hank

OR,

**Time required**=

**…………………………………………………………**

Actual production in hanks X No. of drums

Quantity of yarns in lbs X Yarn count

OR,

**Time required**=

**……………………………………………………**.......(1)

Actual production in hanks X No. of drums

Again we know,

**Actual production per hour per drum in Hank**= Calculated rate of winding in minutes X Efficiency X 60

80

= 1298 X

**……………**X 60 yds

100

1298 80

=

**…………….**X

**………….**X 60 hanks

840 100

= 74.17 hank

Now from (1) No. equation we get,

2388 X 20

**Time required**=

**……………………………….**

74.17 X 40

= 16.098 hrs

**(Ans)**