Dust removal in Blow Room

Dust and microdust are the finest particles of trash. Their removal takes place at various stages in the blow room. Two techniques are mostly used for the removal of dust:

1. By separating the fibres and releasing dust into air, this dust is then removed by removing the dust contaminated air. The release of dust occurs whenever the fibres are rolled, beaten or opened up. In this type of arrangement its not only important to remove the dust contaminated air but also extremely important to maintain a dust free atmosphere in the blow room

2. By separating the dust particles directly from the fibres through suction and scarping. This arrangement is better as compared to the first one as chances of dust to fly in the atmosphere are not present.

Many different techniques are used to separate the dust from the fibres, most common ones are:

(i) Use of perforated drums.

(ii) Use of Stationary Perforated Surfaces.

(iii) Circulating perforated belts.

(iv) Stationary combs

The perforated drums and perforated surfaces are the most commonly used techniques for dust removal For example, in the following diagram a Rieter dust extractor is shown that make use of stationary perforated surfaces The equipment includes a specially designed converging pneumatic duct having perforations on its either side. This duct is enclosed in a chamber. As the material passes through the duct a strong suction fan draws off the fine dust particles from the fibres.

The Here the incoming material is drawn on a perforated drum with the help of air stream. This air stream is then removed by using a high vacuum exhaust through the drum perforation using a suction fan. B doing so. Fine dust also gets removed along with the air. The fibre material is stripped off the perforated drum with the help of a paddle roller The stripped fibre material is then transported to next stage with the help of a suction provided at that end