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 the blow room section. A section in which the supplied compressed bales are opened, cleaned & blending, or mixing to form a uniform lap of specific length is called the blow room section. The cleaning efficiency of the blow room is 60 to 65%. This is the first section of the spinning line for spinning cotton yarn. The number of machines arranged in a line on series to perform all the functions to form a uniform lap form cotton bale in the blow room line. How to find out the production of the blow room line will be discussed below.

Production of the Blow Room Line
Fig: Blow Room Line

Before finding out production of blow room line you should read the following article,

  1. Some Useful Formulas for Spinning (Blow room, Carding, and Draw
  2. Some Important Formulas for Blow Room Section

How to Find Out the Production of the Blow Room Line

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 = …………………………………………………………
…………………….The surface speed of the feed roller

…………..Beater r.p.m X No. of the 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)

Author of this Article:
S. M. Hossen Uzzal
 Production Officer
 Monnu Fabrics Ltd. Manikgonj
 Email: [email protected]

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