Tuesday, 21 April 2009

Blending at Blowroom



Blending at blowroom

There are three methods of blending at blow room:

a. Feeder blending

In this method the blends are prepared by feeding different fibres to different hopper feeders with feeds adjusted to the required blend ratio.

The amount of material taken from each bale for feeding these blenders should not exceed 2-3 kg.

This method is generally employed when more than two components are required to be blended.

b. Stack Blending


In this method the blend components from the bale or bale breakers ( pre opened ) are weighed and laid down in alternate layers

This stack which is laid horizontally is then withdrawn vertically for feeding.

Advantage of Feeder and Stack Blending

a. More intimate and homogeneous blend achieved.
b. Only one opening line needed.
c. Provides simplest control on the use of recovered fibre waste.
d. Requires minimum man hours for blending

Disadvantages

a. Difficult to attain uniform blend ratio
b. Demands greater skill on the part of the operator.
c. Labour intensive and somewhat slow.


c. Lap Blending

In this the laps of the components fibres made at the breaker skutcher generally 3 to 4 are blended by feeding them together to the finisher scutcher in the desired ratio.

Advantages of Lap Blending

a. Ensures good blend homogenity
b. Easy to work.
c. Good control on the use of recovered fibre waste.
d. Uniform blend ratio is achieved

Disadvantages

a. Opening line has to be modified to provide for both breaker and finisher scutchers.
b. Need for proper control on lap weights.

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