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AssigneeHoechst Aktiengesellschaft
InventorsFranz Durst, Raimund Haas, Guenter Hultzsch, Manfred Dammann, Gerhard Mack, Werner Interthal, Joachim Stroszynski, Peter Lehmann
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A process for drying a liquid layer which has been applied to a carrier material moving through a drying zone and which contains vaporizable solvent components and non-vaporizable components, wherein a drying gas flows in the longitudinal direction of the carrier material parallel to the liquid layer and is accelerated in the drying zone in the direction of flow, is disclosed. Also disclosed is a device for accomplishing the drying process, comprising a drying channel through which the carrier material bearing the liquid layer runs in the longitudinal direction, and a gas-permeable channel-covering surface, through which the gas stream flows into the drying channel.
A process for drying a liquid layer which has been applied to a carrier material moving through a drier comprising a drying zone and which contains vaporizable solvent components and nonvaporizable components, wherein a gas flows in the longitudinal direction of said carrier material parallel to said liquid layer and is accelerated within said drying zone in the direrction of flow, the inlet velocity of the gas flow is increased to a final velocity of up to about 1000 times said inlet velocity, and disturbances arising in the inlet cross-section and at the beginning of the drying zone, such as eddies and turbulence in said gas flow, are damped out, so that said gas flow becomes laminar within said drying zone.
A device for drying a liquid layer which has been applied to a moving carrier material and which contains vaporizable solvent components and nonvaporizable components, which comprises a drying channel through which said carrier material runs in the longitudinal direction, a horizontal channel base surface, and a channel-covering surface through which a stream of drying gas flows into said drying channel, wherein said channel-covering surface (a) is gas-permeable, the permeability of said surface being adjustable in the longitudinal direction of said drying channel, (b) is included relative to said channel base surface such that the channel inlet height of said drying channel is greater than the channel outlet height of said drying channel, and (c) extends over the entire length of said drying channel, starting at the channel inlet.
Dependencies are inferred from the claim text.