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.
  • BlowroomBlow room

  • 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
    fibre coherence
    fibre alignment
    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
    grid settings
    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
    ambient R.H.%
    ambient teperature

  • 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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