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Tobacco leaf curing system

  • US 3,937,227 A
  • Filed: 02/28/1974
  • Issued: 02/10/1976
  • Est. Priority Date: 02/28/1974
  • Status: Expired due to Term
First Claim
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1. A tobacco leaf curing plant for processing tobacco leaves which comprises a substantially air-tight curing barn divided by a porous floor plate into an upper drying chamber adapted to house the tobacco leaves and a lower air chamber, a circulation duct passageway containing fan means and the heating means, an air circulation port means providing communication between one end of the circulation duct passageway and the drying chamber for drawing air from the drying chamber, and a distribution chamber disposed at the other end of the circulation duct passageway, said distribution chamber providing communicatin between said other end of the circulation duct passageway and the lower air chamber for introducing air compressed by said fan means and heated by said heating means into said lower air chamber, an ambient air inlet port provided with an automatic for controlling the amount of ambient air drawn from the atmosphere through the inlet port and introduced into the air circulation duct passageway so as to change the mixing ratio of the ambient air to the circulating air being supplied to the lower air chamber, an automatic temperature regulator connected to the fan means and the heating means and a wet bulb temperature sensor connected to the automatic temperature regulator, said temperature regulator adjusting the heating means according to variations appearing on the wet bulb temperature sensor, thereby regulating and maintaining the temperature and humidity of the air sent to the lower air chamber at a fixed, predetermined level, and an outlet port means disposed in the wall of the drying chamber for exhausting a portion of the air from the drying chamber to the atmosphere, said outlet port means being provided with a control plate associated therewith, and means for opening or closing the outlet port means depending upon the presure differential between the circulating air inside the drying chamber and the atmospheric air.

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