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How to Find Out the Production of the Blow Room Line

How to Find Out the Production of the Blow Room Line
S. M. Hossen Uzzal
Production Officer
Monnu Fabrics Ltd. Manikgonj
Email: uhossen@gmail.com




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
Modern blow room line
Before find out production of blow room line you should must read the following article,
  1. Some Useful Formulas for Spinning (Blow room, Carding and Draw
  2. 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, Blow 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)

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