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 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