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PROCESS PARAMETER IN BLOW ROOM - 2

blow room

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If Uniflco11(Rieter) or Blendomat BDT 019(Trutzschler) is used as a first machine

  • It helps to maintain the homogeneity of the long term blending

  • cotton is opened gently without recyling as it is done in manual bale openers

  • with the latest automatic bale opening machines,  the tuft size can be as small as 50 to 100 grams without  rupturing the fibres

  • the opening roller speed should be around 1500 to 1800 rpm.

  • the depth of penetration of the opening  should be as minimum as possible for better quality

  • It is better to use this machine with one mixing or maximum two mixing at  the same.

  • If the production per feeding machine is less than 150 kgs, then four mixings can be recommended

  • production rate of this machine depends upon the no of mixings working at the same time

  • production rate depends  upon opening roller depth, traverse speed and the fibre tuft density

  • in general , the machine parameters should be set in such a way that  maximum number of take-off points are available  per unit time.

  • with the latest machines (Rieter -Unifloc A11), around 60% of take-off points are more compared to earlier machines

PRECLEANING:

Precleaning should be gentle. Since removing finer trash particles is difficult , seeds and bigger trash particles should not be broken. Finer trash particles require severe treatment in Fine openers. This will lead to fibre damage and more nep generation. Therefore, precleaning should be as gentle as possible and no compromise on this. If preopening and precleaning are done  properly,  consistency in trash removal by fine openers is assured. Dust removal should be started in this machine. Enough care should be taken remove dust  in this process.

Rieter's Uniclean B11 and Trutzschler's Axiflow or Maxiflow  are the machines which does this work

  • the fibre treatment in this machine is very gentle because  the fibres are not gripped by the feed roller during beating.  Fibre tufts treated by the pin beater when it is carried by air medium

  • all heavy trash particles fall down before it is broken

  • cleaning efficiency of this machine is very high in the blow room line

  • Mostly all heavy seeds( full seeds) fall in this machine without any problem

  • around 50 pascal suction pressure should be maintained in the waste chamber for better cleaning efficiency

  • beater speed, air velocity through the machine, grid bar setting and gap between grid bars will affect the cleaning efficiency

  • higher the cleaning efficiency,  higher the good fibre loss, higher the nep generaion and higher the fibre rupture

  • the optimum cleaning means maximum cleaning performance, minimum loss of good fibres, a high degree of fibre preservation and minimum nep generation

  • Rieter has a unique concept called "VARIOSET". With this machine, selective trash removal is possible. Waste  amount can be changed in a range of 1:10.

fig: from Rieter which shows , degree of cleaning, fibre loss, neps, fibre damage.

  • with normal machines like Monocylinder or axiflow, a lot of trials to be conducted to arrive at optimum beater speed, air velocity(fan speed), grid bar setting and grid bar gap.

  • in general the beater speed is around 750 and  minimum 50 pascal suction pressure to be maintained in the suction chamber

 

BLENDING:

  • Barre or streakiness is due to uneven mixing of different cottons. Hence mixing technology is a decisive factor in spinning mill technology

  • bigger the differences of cotton parameters like fineness, color and staple length, the greater the importance of mixing

  • if the cotton has honeydew, the intenisive mixing of the rawmaterial is a precondition  for an acceptable running behavior  of the complete spinning mill

following  fig is given by trutzschler for different  mixing requirements

                                        standard               standar- plus              high                   high-end

  • Trutzschler's tandem mixing concept is an  ultimate solution, if the mixing requirement is very high. This principle guarantees a maximum homogeneous of the mix

FIG.Tandem mixing concept from TRUTZSCHLER:

 

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