Cotton is a natural fibre and it absorbs a lot of moisture from atmosphere.
Blow room processing of material tends to increase bp level by.
In case of low grade cotton coarser mixing below 40s trash in low grade cotton is high.
The maximum noise level is observed at the front of the machine because of the movement of siey which causes air turbulence.
The process wise analysis refers to nep increase at blow room and nep reduction at card.
And there are 1 5 to 7 trash in cotton bale which is also needed to be removed before further processing.
The fibre processes well with appropriate level of moisture gained from atmosphere.
Alan and alexander 1988 pointed out that processing of fibres tends to produce neps through a stress.
Once the level of card sliver neps required are decided the level of neps required at blow room material and target level at mixing can be arrived.
It is important to arrive the product standards considering the end use requirement for card sliver.
The process wise analysis refers to nep increase at blow room and nep reduction at card.
Shuttle noise level increases by about 1 5 2 0 dba.
Truetzschler machine from germany has enough cleaning points in the blow room.
This tends to increase the percentage of short fibres and the level of neps.
Cards together with the variation in blow room a major part of this variation can be attributed to blow room.
So atleast 7 beating points are required to open and clean the cotton.
The thrash contained in the fibre supply also tends to disintegrate into micro dust due to the saw tooth action.
In comparison the pin has a smooth round surface and a spherical tip which opens the fibres through a gentle untangling action.
Trails have been carried out with two different noil percentage 9 and 10 to make 80 s ne count yarn with the same process parameters from blow room to ring frame.
This sketch represents the blow room line suitable for processing all range of counts.
Cotton fibre is compressed in a bale of 200 to 250 kg.
Almashouley 1988 reported that inadequate settings and inadequate feedings are the sources of variation in weight per yard of lap.
As the 100m speed increases the noise level also increases significantly due to the higher impact forces acting on the different parts of a loom.
Once the level of card sliver neps required are decided the level of neps required at blow room material and target level at mixing can be arrived.
This process of opening cleaning is knows as blow room process.
Very high level of moisture above 65 disturbs processing as the fibres tend to sti.
So the machine should have enough cleaning points.
It is important to arrive the product standards considering the end use requirement for card sliver.
