**How to Find Out the Production of the Blow Room Line**

**Blow Room Line:**

A section in which the supplied compressed bales are opened, cleaned and blending or mixing to form uniforms lap of specific length is called blow room section.

The number of machines arranged in a line on series to perform all the function to form a uniform lap form cotton bale is called blow room line.

Modern blow room line |

**Some Useful Formulas for Spinning (Blow room, Carding and Draw****Some Important Formulas for Blow Room Section**

**Problem-1:**

Find out the blow room efficiency, when

- Cotton trash = 4.5%
- Lap trash = 1.75%

**Solution:**

We know,

Trash extracted

**Cleaning efficiency**=

**……………………………**X 100%

Total trash

Cotton trash% - Lap trash%

So, B

**low room cleaning efficiency**=

**……………………………………**X 100%

Cotton trash%

4.5 – 1.73

=

**……………………**X 100%

4.5

= 61.11 %

**(ANS)**

**Problem-2:**

Find out beats/inch from the following, When

- Beater r.p.m = 720
- No. of strikes = 16
- Feed roller r.p.m = 24
- Dia of feed roller = 3”

**Solution:**

Beat / min

**Beat / inch**=

**…………………………………………**

Surface speed of the feed roller

Beater r.p.m X No. of beater

=

**…………………………………………………………**

Π X Dia of feed roller X Feed roller r.p.m

720 X 16

=

**…………………..**

Π X 3 X 24

= 76.43 or 76

**(ANS)**

**Problem-3**:

Find out the production of blow room line with 2 scutchers.

It contains,

- Calender roller dia = 7”
- Calender roller rpm = 10
- Efficiency = 40%
- Wastes = 4%
- Lap weight = 1403 yds

**Solution:**

Π X 10 X 7 X 60 X 0.90 X (14/16) X (100-4) X 2

=

**………………………………………………………………**

36 X 100

= 555.176 lb/hr

**(ANS)**