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PROCESS PARAMETER IN BLOW ROOM - 3

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FINE CLEANING:

Fine cleaning is done with different types of machines. Some fine cleaners are with single opening rollers  and some are with multiple opening rollers.

  • If single roller cleaning  machines are used, depending upon the  amount and type of trash in the cotton, the number of fine cleaning points can be either one or two. 

  • If the production  rate is lower than 250 kgs and the micronaire is less than 4.0, it is advisable to use single roller cleaning machines instead of multiple roller cleaning machine.

  • Saw tooth beaters can be used, if trash particles are more and the machine is not using suction and deflector blades. i.e beater and regualar grid bar arrangements

  • Normal beater speeds with sawtooth beater depends upon the production rate,  fibre micronaire and trash content

TYPE OF COTTON COTTON MICRONAIRE PROUDCTION RATE kgs/hr BEATER SPEED rpm
more trash 3.5 to 4.0 200 to 300 kgs /hr 600 to 750
less trash 3.5 to 4.0 200 to 300 kgs/hr 600 to 750 
more trash 4.0 to 4.5 200 to 300 kgs 700 to 850
less trash 4.0 to 4.5 350 to 500 kgs 1000 and above
  • the number of wire points depends on the proudction rate and trash.

  • setting between feed roller and beater depends on the production rate and micronaire.  The setting should be around 2 to 3 mm.  Wider setting always result  in higher rawmaterial faults, if carding does not take care.

  • closer the setting between beater and moteknives, higher the waste collected. It is advisable to keep around 3 mm.

  • If it is a Trutzschler blowroom line, it is better to use  CVT1 ( single opening roller machine) if  roller ginned cotton  is used.

  • CVT3  or CVT4 machines with 3 or 4 opening rollers can be used for saw ginned cotton.

 

 

  • The cleaning points in CVT1, CVT3, CVT4 etc consists of opening roller, deflector blades, moteknives and suction hood. Trash particles released due to centrifugal forces are  separated at the moteknives and continuously taken away by the  suction. This gives better cleaning

FIG: trash removal concept in CVT cleaners:

  • suction plays a major role in these machines. If suction  is not consistent , the performance will be affected badly.  Very high suction will result in more white fibre loss and less suction will result in low cleaning efficiency.

 
  • The minimum recommended pressure in the waste chamber (P2) is 700 pascals. It can be upto 1000 pascals.

 
  • material suction (P1) should be around 500 pascals 

 
  • Whenever the suction pressure is changed, the deflector blade settings should be  checked

 
  • Deflector blade setting can not be same for all the three rollers or four rollers. The setting for deflector blades in the panel looks like this 3, 12, 30 for 1st, 2nd and 3rd deflector blades.

 
  • The deflector blade setting should be done in such a way that  the setting should be opened till the fibres start slipping on the deflector blade.

 
  • wider the deflector blade setting, higher the waste. If the setting is too wide, white fibre loss will be very high.

 
  • for saw ginned cottons, the above concepts helps a lot because of constant suction concentrated directly at the moteknives, ensures much removal of dust from the cotton.

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