BLOW ROOM
Blow room :
Blow room is the first section of spinning line for spinning cotton yarn from fiber. It consists of a number of machines which are used one after another for opening and cleaning cotton fiber from its bale to a required degree. Besides these fibers can also be mixed or blended in this section. In this section from cotton bale, we produce lap of specific length and width.Blow room contributes only about 5% - 10% to production cost in ring spinning mill. About 50% – 60% cleaning efficiency can be obtained from blow room by which about 40% - 70% of trash is removed from raw cotton.
In this section cotton are opened, cleaned, mixed and to produce a uniform lap/supplied by uniform rate at card chute.
Blow room operation :
a) Opening : To open the compressed bales of fiber and make the cotton tuft as small size as possible.
b) Cleaning : To remove the dust, broken seeds, broken leaves stalk and other foreign materials from the fiber.
c) Mixing/Blending : To make a new kind of cotton by mixing the different cotton fiber or blending different fiber.
d) Lap forming/Chute feed : To transfer the opened and cleaned cotton by lap forming / chute feeding systems.
Machines in blow room:
The following machines are used in a conventional blow room one after another for opening, cleaning and blending of fibers.
a) Bale breaker machine.
b) Step cleaner or ultra cleaner.
c) Vertical opener.
d) Hopper feeder – 1.
e) Porcupine opener machine.
f) Hopper feeder – 2.
g) Scratchier machine.
Of them b, c, e, g are major cleaners and the others are minor cleaners. That is to say a, d, f are minor cleaners.
Action in blow room :
The actions of the machines in any blow room range fall into one or more of four main groups namely.
a) Action of opposite spike (Opening) : The main action of opposite spikes is to open the fiber up to a range without fiber damage.
b) Action of air current (Transport + Cleaning) : During processing the movement of cotton from machine to machine is done by air current. It also helps the separation of lint and trash.
c) Action of beater (Cleaning & opening) : Beaters are responsible for removing almost all of the impurity extracted in the blow room. Beater also helps in opening of cotton fiber.
d) Action of regulating motion (uniform output) : The action of regulating motion gives the uniform output of cotton fiber by the help of swing door and swing paddle.
Lap Specification :
Lap length → 60 yds
Lap weight → 40 – 50 pounds
Lap weight/yds → 12 – 16 ozs
Lap weight variation → 3% (Acceptable)
Hank → 0.11 – 0.19 Ne
Mechanical Draft → 2.67 (Approximate)
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