Blowers separate light recyclable material
An
Air Control Industries product story
Edited by the Engineeringtalk editorial team
Jul 10, 2008
ACI recommended centrifugal blower units because they deliver the best air flow and pressure for their size, ideal for blasting "lights" from falling media.
McCloskey International is using blowers to cheaply and quickly extract light materials from skip loads of waste at recycling plants at Southampton and North London.
'Lights' such as paper, plastic and cardboard can downgrade potentially recyclable waste material collected in skips.
Typically, when skips arrive at the sorting depots large items, such as fridges and TVs, are removed by hand or using mechanical grabbers.
The next stage would be to eliminate 'fines' or media smaller than 40mm.
This would be done by loading the material into a rotating trommel screen drum with either a mesh or pierced metal sheet with 40mm apertures.
This material, which can include clay and small stones, might be used in gardens on building sites.
In the next stag oversize material is conveyed up to a picking station.
At the end of the conveyor the material is allowed to drop a distance of about 1m onto a second conveyor.
This is the first point where a blower is used extract "lights" by blowing a continuous curtain of air horizontally across the drop.
Caught by the blast of air, "lights" are blown from the falling material into a collection bin on the opposite side of the conveyor.
The remaining material runs through a manual sorting station which extracts wood, ferrous metals, aluminium, copper and plastics.
A similar blast of air takes place as the last of media falls off the picking station conveyor.
The blowers used by McCloskey are forward-bladed, centrifugal units supplied by Air Control Industries (ACI).
ACI recommended centrifugal blower units because they deliver the best air flow and pressure for their size, ideal for blasting "lights" from falling media.
ACI has supplied both 15 and 18.5kW blowers to McCloskey International, along with complementary speed control inverters.
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