Agitating – Mortar mixer type – Methods
Patent
1979-05-16
1982-06-01
Jenkins, Robert W.
Agitating
Mortar mixer type
Methods
366 25, 366 33, B28C 546
Patent
active
043324789
ABSTRACT:
A method and apparatus are disclosed which reduce smoke emissions in an asphalt drum mixer. A drum mixer heats virgin aggregate to a relatively high temperature in a first drying zone. Virgin asphalt and, in some cases, recycled pavement material containing asphalt, are added in a second zone. Mixing and discharge of the materials occur in a third zone. The invention provides for air or water cooling of the gases in the drum mixer upstream of the point of entry of the asphalt. This cooling reduces the formation of smoke which would otherwise be generated by excessive heating of the asphalt. The apparatus, according to a preferred embodiment, employs an axially positioned air duct, the outlet end of which discharges cooling air into the drum just upstream of the area of entry of the recycled material.
REFERENCES:
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patent: 3832201 (1974-08-01), Shearer
patent: 3845941 (1974-11-01), Mendenhall
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patent: 4000000 (1976-12-01), Mendenhall
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patent: 4075710 (1978-02-01), Jakob
patent: 4147436 (1979-04-01), Garbelman
patent: 4190370 (1980-02-01), Brock
patent: 4211490 (1980-07-01), Brock
Barber-Greene Company
Jenkins Robert W.
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