Blowroom - Page 2
- These deposits change the surface characteristics which directly affects the quality and running behavior.
There are chemicals which can be sprayed to split up the sugar drops to achieve better distribution.
But this system should use water solutions which is not recommended due to various reasons.
It is better to control the climate inside the department when sticky cotton is used. Low temperature
( around 22 degree Celsius) and low humidity (45% RH). This requires an expensive air conditioning set up.
The easiest way to process sticky cotton is to mix with good cotton and to process through two blending machines with 6 and 8 doublings and to install machines which will seggregate a heavier particles by buoyancy differences.
General factors which affect the degree of opening , cleaning and fibre loss are,
- thickness of the feed web
density of the feed web
size of the flocks in the feed (flock size may be same but density is different)
the type of opening device
speed of the opening device
degree of penetration
type of feed (loose or clamped)
distance between feed and opening device
type of opening device
type of clothing
point density of clothing
arrangement of pins, needles, teeth
speeds of the opening devices
throughput speed of material
type of grid bars
area of the grid surface
airflow through the grid
condition of pre-opening
quantity of material processed,
position of the machine in the machine sequence
feeding quantity variation to the beater
Cotton contains very little dust before ginning. Dust is therefore caused by working of the material on
the machine. New dust is being created through shattering of impurities and smashing and rubbing of fibres.
However removal of dust is not simple. Dust particles are very light and therefore float with the cotton
in the transport stream.Furthermore the particles adhere quite strongly to the fibres. If they are to be
eliminated they are to be rubbed off.The main elimination points for adhering dust therefore, are those points in the process at which high fibre/metal friction or high fibre/fibre friction is produced.
- Removal of finest particles of contaminants and fibre fragments
can be accomplished by releasing the
dust into the air, like by turning the material over, and then
removing the dust-contaminated air.
Release of dust into the air occurs whereever the raw material is rolled, beaten or thrown about. Accordingly the air at such positions is sucked away. Perforated drums, stationary perforated drums, stationary combs etc.... are some instruments used to remove dust.
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