**Production Calculation of Blow Room**

**Abdullah Nur Uddin Rony**

Textile Engineering College, Noakhali

Facebook: Abdullah Rony

**Blowroom:**

The
section where the supplied compressed bale is turn into a uniform lap
of particular length by opening, cleaning, blending or mixing is called

**blow room**. It is the starting of the spinning operation where the fibre is opened, cleaned, mixed, micro dust removed and evened thus passed to carding machine without increasing fibre rupture,**fiber neps**, broken seed particles and without removing more good fibers. In this article I have given example of blowroom production.Blowroom section |

**Production Calculation of Blow Room**

* 1 lb = 16 ounce = 7000 grain = 453.6 gm.

* 1 Metric ton = 2204 lb.

* 1 kg = 2.2046 lb.

**Problem-1:**

A lap contains 2% trash after processed in B/R having the cleaning efficiency of 80%. Find the trash % in raw cotton.

**Solution:**We know,

Trash remains after processing

**Cleaning efficiency = ………………………………………**

Total trash

2%

=> 80 =

**..........................**

Total Trash

=> Total Trash = 2/100 x 80

=> Total Trash = 2.5%.

**(Ans.)**

**Problem-2:**

Bottom calender roller dia = 7 inch, rpm = 10 & wt. of every yds lap is 12 oz and cleaning efficiency 75%. Find out the production of B/R per hour.

**Solution:**3.14 x 7 x 10 x 60 x 75 x 12

**Production/hr of B/R = ………………………………**

36 16 x 100

= 206.06 lb

**(Ans.)**

**Problem-3:**

If lap length constant is 720, then set the change pinion for 40 yds lap.

**Solution:**lap length constant

**Change pinion = …………………...…**

lap length

720

=

**………..**

40

= 18 T

**(Ans)**

**Problem-4:**

If lap wt. is 15 oz per yds, find the hank.

**Solution:**1 yds x16 ounce

**Hank = ……………...........…….**

840 yds x15 ounce

= 0.0012 hank.

**(ANS)**

**Problem-5:**

If lap wt. – (a) 15 lb/yds, (b) 15 lb/m, (c) 15 grain/yds, (d) 15gt/m, (e) 15gm/yd, (f) 15gm/m. Find the hank.

**Solution:**1 yds x16 lb

**a. Hank = …………………..**= 0.0000793 hank.

**(Ans)**

840 yds x15 lb

1 m x1 lb

**b. Hank = ………........….**

840 yds x15 lb

1.1 yds x1 lb

=

**………………………..**

840 yds x15 lb

= 0.0000873

**(Ans)**

1 yds x 7000 grain

**c. Hank = ………………................**= 0.55

**(Ans)**

840 yds x15 grain

1 m x 7000 gr

**d. Hank = ………….........……**

840 yds x15 gr

1.1 x 7000

=

**…………………**

840 x15

= 0.611

**(Ans).**

1 yds x 453.6 gm

**e. Hank = ……………..……….**= 0.036.

**(Ans)**

840 yds x15 gm

1 m x 453.6 gm

**f. Hank = ……………………..**

840 yds x15 gm

1.1 x 453.6

=

**…………………**

840 x15

= 0.0396.

**(Ans)**

**Problem-6:**

Find the no. of lap per hour in scutcher m/c of Bottom calender roller dia = 7 inch, rpm = 12, efficiency 80%. Lap length 40 yds.

**Solution:**

π x 7 x12 x 80 x 60

**Production of m/c = …………………………**yds

36 x 100

= 351.85 yds.

351.85

**No. of lap = …………**

40

= 8.79 = 9

**(ANS)**

**Problem-7:**

Find the no. of lap per hour in scutcher m/c of Bottom calender roller dia = 7 inch, rpm = 12, efficiency 80%, lap wt. 14 oz/yds.

**Solution:**3.14 x 7 x12 x 0.80 x 60 x 8 x14

**Production = …………………………..............….**lbs

36 x16

= 2461.76 lbs

2461.76

=

**…………….**metric ton

2204

= 1.117 metric ton.

**(Ans)**

**Problem-8:**

If in a xsutcher m/c, rpm of B.C.R. is 10, dia 7 inch, lap wt. 12 oz/yd. Find the production/hr at 90% efficiency.

**Solution:**3.14 x 7 x10 x12 x 60 x 90

**Production = ………………………...…….**lbs

36 x 16 x 100

= 247.275 lbs

**(ANS)**

**Problem-9:**

Production of B/R line with 2 scutchers if B.C.R. dia = 7 inch, rpm = 10, Efficiency 90%, wastes 4%, lap wt. 14oz/yd.

**Solution:**3.14 x 7 x10 x1x 60 x 90 x (100 - 4) x 2 x14

**Production = ………………...................................…………….**lbs

36 x16 x100 x100

= 553.896 lbs.

**(Ans)**

**Problem-10:**

Calculate production/he of a B/R line if, r.p.m. of B.C.R. = 14, Dis = 18 cm,, lap hank = 0.0012, efficiency 80%, no. of scutcher = 2.

**Solution:**3.14 x18 x14 x 60 x 0.80 x 2

**Production = …………………………..........….**lbs

36 x 2.546 x 840 x 0.0012

= 822.2 lbs.

**(Ans)**

**Problem-11:**

Find the B/R cleaning efficiency, if waste in Raw cotton = 6%, waste in sliver = 0.4%. Carding, cleaning efficiency 75%.

Solution:Solution:

waste in lap - waste in sliver

**Carding cleaning efficiency = ………………………..……….**X 100

waste in lap

x - 0.4

=> 75 =

**……....**x 100

x

=> x = 1.6%.

6 – 1.6

**B/R cleaning efficiency**=

**……...…**x 100

6

= 73%

**(Ans.)**

**Problem-12:**

The trash control of feed cotton is 3%. After passing the beater 2% waste is extracted, of which 15% is good fibre, what is the cleaning efficiency of the beater?

**Solution:**100-15

2% waste extraction,

**……..…**x 2 = 1.7% of the original trash has been taken out by beater.

100

(3-1.7) = 1.3% trash remain in the mtls, which is delivered from the beater.

Original T.C - T.C. in delivered cotton

**Cleaning Efficiency = …………………………….........………..**x 100

Original T.C

3-1.3

=

**……….**x 100

3

= 56.66%

**(Ans.)**

**Problem-13:**

Find out beats/inch from the following data- Beater r.p.m. = 720, no. of striker = 16, Feed roller r.p.m. = 24, Dia of feed roller = 3 inch.

**Solution:****Beats / min**= Beater r.p.m. x no. of striker

= 720 x16 no.s

= 11520 no.s

**Surface speed of feed roller**= πDN

= 3.14 x 3 x 24

= 226.08

11520

**Beats / inch = ……………….**

226.80

= 50.96

**(Ans.)**

**Problem-14:**

The trash content of a cotton as fed to Beater 3.6%. The waste extraction is 1.5% of which 80% is trash. What is the cleaning efficiency of the beater?

**Solution:**

80

1.5% waste extraction,

**………**x 2 = 1.2% of the original trash has been taken out by beater.

100

(3.6-1.2) = 2.4% trash remain in the mtls, which is delivered from the beater.

Original T.C - T.C. in delivered cotton

**Cleaning Efficiency = …………………………………...........…..**x 100

Original T.C

3.6-2.4

=

**…………..**x 100

3.6

= 33.3%

**(Ans.)**