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US 4,989,348 AGranted
Continuous-flow dryer for material webs, in particular offset dryer process for the thermal operation of a continuous-flow dryer
OwnerHilmar Vitsinventor
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OwnerHilmar Vitsinventor
Estimating the term…
The invention relates to a dryer, in particular offset dryer for material webs containing high-boiling solvents to be dried in a continuous flow. The heating-up of the dryer atmosphere with a burner takes place in a closed chamber arranged in the dryer casing. Circulating air is fed to the burner as combustion air. Further circulating air, containing solvent vapors, is mixed in with the flue gas of the burner in the chamber in order that the solvent is completely burned. The temperature-controlled hot gases of the after-burning are cooled by mixing in fresh air at the inlet slit and, if appropriate, outlet slit to such a low temperature before they pass into the dryer interior that cracking of the volatile solvents in the circulating air of the dryer cannot occur. The volatile solvents, which can be used as fuel, can be extracted from the exhaust air, which like the circulating air only contains volatile solvents as pollutants, by cooling.
A continuous-flow dryer for a material web comprising within a dryer casing one or more blowing nozzles for applying heated air to one or both sides of the material web, with at least one blower feeding the blowing nozzle with recirculated air within the interior of the dryer casing, at least one gas-fired heating device for the recirculated air and an after-burning device, as well as an inlet slit through said casing and an outlet slit through said casing for the material web, mixing chambers being provided adjacent to at least one of said slits above and below the material web, an outlet of the after-burning device being connected to a discharge device at the inlet slit for mixing the hot gases of the after-burning device with fresh air streaming in via the inlet slit and which have the outlets to the dryer interior, wherein each heating device and after-burning device fed with gas and said recirculated air is combined into a unit and has a closed combustion chamber in the dryer casing.
A process for the thermal operation of a continuous-flow dryer for material webs which give off high-boiling solvents into the dryer atmosphere during drying, with air heated up by a gas burner applied to them, which solvents are fed to a thermal after-burning facility, from which the heat energy generated is used for the heating-up of the dryer atmosphere, fresh air, entering at a dryer inlet slit being mixed in with the host gases comprising
Dependencies are inferred from the claim text.