Heating – Work chamber having heating means – Having means by which work is progressed or moved mechanically
Patent
1980-10-20
1982-12-07
Camby, John J.
Heating
Work chamber having heating means
Having means by which work is progressed or moved mechanically
432163, F27B 900
Patent
active
043625053
ABSTRACT:
Apparatus for treatment of concrete articles having a pre-drying chamber where the articles are pre-treated by being blown with air having a temperature of from 40.degree. C. to 100.degree. C. The apparatus is provided with a treatment channel where the pre-dried articles are received and treated in a temperature-increase zone with a steam-air mixture for a period of 1-6 hours. The articles are treated in this first zone with a temperature increase and the temperature and humidity are gradually increased to their permissible values corresponding to the given type of articles. The articles are moved from the first zone to a second zone constituting an isothermal zone where the articles are treated for a period of 2-6 hours with an air-steam mixture and a temperature from 60.degree. to 90.degree. C. and a relative humidity close to 100%. From this latter zone in the tunnel the articles are moved into a cooling zone where the articles are cooled by blowing of air for a period of from 0.3 to 1.5 hours and having a relative humidity. The apparatus is provided with a manifold delivering air from the pre-drying chamber into an end of the tunnel at the temperature-increase zone. Ducts deliver air from the pre-drying chamber to the manifold. Internal ducts in the channel provide for air recirculation in the individual tunnel treatment zones.
REFERENCES:
patent: 584645 (1897-06-01), Olsen
patent: 1171874 (1916-02-01), Petersen
patent: 3471135 (1969-10-01), Cremer
patent: 3841614 (1974-10-01), Okuno
patent: 4192645 (1980-03-01), Hassler
patent: 4249895 (1981-02-01), Mantegani
patent: 4310300 (1982-01-01), Mackenzie
Bubelo Vilya V.
Froze Raisa M.
Ganzhara Vladimir I.
Timofeev Vitaly M.
Adams Bruce L.
Burns Robert E.
Camby John J.
Lobato Emmanuel J.
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